Long Island Skip Tracing and People Search
Two counties share this island and they do not share a records system with each other, let alone with the city to the west. Nassau keeps its land index and its assessments in county hands. Suffolk keeps its land index in county hands and its assessments in the hands of ten separate towns, and will not let a deed be recorded until a county division has checked it against the tax map first. Everything a searcher wants here – who holds title, who claimed the exemption, which mailing address the tax bill went to, and when any of it last changed – sits in one of those systems rather than in a national database. This page names the offices, quotes the statute that puts the annual roll in a town clerk’s cabinet for ten years, and marks the places where the honest answer is a limit rather than an address. Records research under a lawful purpose, done by people who hold no private investigator’s license and never suggest otherwise. General information about public records here, not legal advice.
The Short Version
Long Island skip tracing, on this page, means Nassau County and Suffolk County and nothing else. Recorded land documents belong to the Nassau County Clerk in Mineola and to the Suffolk County Clerk separately; New York’s County Law makes each county clerk the register and the clerk of the supreme and county courts, so the same office holds the deed and the case file. Suffolk publishes its recorded documents online from 1987 forward and lets you search them by street address, which is unusual and useful. It also requires a document to be checked against the county tax map before it can be recorded at all. Assessment is where the two counties stop resembling each other: the Nassau County Department of Assessment values every parcel in that county from one office, while Suffolk has no county assessor and its ten towns – Babylon, Brookhaven, East Hampton, Huntington, Islip, Riverhead, Shelter Island, Smithtown, Southampton and Southold – each run their own. The annual roll those offices produce is filed with the city or town clerk and kept there as a public record for at least ten years, which makes it the closest thing on this island to a dated, per-parcel ownership timeline. We read it. Under a purpose the law permits, with the limits written down. Nothing here is legal advice.
Watch: why two counties on one island search differently
Where the deed sits, where the roll sits, and why those are not the same building.
Play the island briefing
Two counties, two clerks, and nothing borrowed from the city
The first assumption to throw away before a search starts.
People arriving at this island from the west expect its paperwork to be an extension of the city’s. It is not, at any level. Nassau and Suffolk each maintain a complete land-records operation of their own, with their own indexes, their own coverage dates, their own search tools and their own quirks, and neither one draws on any city office for anything. A deed to a house in Massapequa and a deed to a house in Sayville are recorded in two different county buildings, indexed under two different systems, and retrieved by two different methods. Nothing about one tells you anything about the other.
The reason both offices carry so much is statutory rather than local. Under New York’s County Law, a county clerk performs the duties of register and is also the clerk of the supreme court and of the county court for that county. That is one office wearing two hats a researcher usually has to visit separately elsewhere: the recorded instrument against a parcel and the civil case file naming the same person can be sitting in the same custodian’s care. Where a searcher in another state builds a two-office plan, here the plan starts by asking which of the two counties, and only then which index inside it.
What each clerk actually publishes
The Nassau County Clerk describes the office as created by the New York State Constitution and serving as clerk of the supreme and county courts, and states that Nassau land documents can now be searched online. The public counter sits at 240 Old Country Road in Mineola, which is also where the county’s assessment operation is housed, so a Nassau file can often be worked against two custodians in one building.
Suffolk publishes more of its coverage detail in public, and the detail is the useful part. The Suffolk County Clerk’s online records service states that the site carries land records recorded and imaged into the office’s imaging system from 1987 to the present, describes the collection as roughly 2.5 million documents, and lists the search categories it offers: address, property tax map identifier, last name or corporation, liber and page, index number, UCC number, and business name.
Read that list again, because one entry on it is rare. Suffolk lets you search recorded land documents by street address. Most recording offices in the United States index by grantor and grantee name only, which means a searcher holding an address and no name has nothing to type. Here that search runs, and it runs against forty years of imaged instruments. When the starting point is a building rather than a person, that is the door, and it is the same approach we take generally when working back from an address to the owner behind it. The office does flag one exception in its own instructions: a condominium cannot be found by property address and needs the exact tax map number instead, and it tells you to get that number from the town assessor’s office where the property sits. That instruction is worth noticing early. The county clerk is pointing you at a town office, which is the shape of the whole island.
Suffolk will not record a deed until the tax map agrees
A county checkpoint that Nassau has no equivalent of.
Suffolk County runs a step in the recording process that catches people out, and it is not a formality. The Suffolk County Real Property Tax Service Agency states that its Tax Map Division has the responsibility and is the sole authority for creating and maintaining the tax maps of the county, and that verification – the procedure that keeps the information on each tax map parcel current – is required by law before documents can be recorded. A deed in Suffolk therefore passes through a county mapping office before it reaches the county clerk’s index.
Two things follow for research. The first is that the tax map identifier, not the street address, is the true key to a Suffolk parcel, which is exactly why the county clerk’s own condominium instruction sends you to a town assessor to obtain it. Once you hold that identifier the county’s records line up cleanly around it; without it you are working with the least reliable field in the file. The second is that the agency itself is a records source and not merely an administrative gate. Its Riverhead location, at the Riverhead County Center on County Road 51, is described as holding an owner index alongside the tax map information, which makes it a place where a parcel and a name are already connected for you.
Nassau imposes no equivalent county mapping checkpoint on recording, which is a small difference on paper and a real one in practice: the same transaction generates a slightly different documentary trail depending on which side of the county line the house stands. Anyone doing locate work behind a title search or a closing on this island learns that difference quickly, because it changes both what exists and when it appeared.
Nassau assesses from one desk. Suffolk has ten.
One state statute, two opposite architectures, twenty miles apart.
New York’s Real Property Tax Law is unusually permissive about who does the assessing. Its definitions section defines an assessing unit as a city, a town or a county with the power to assess real property, unless it forms part of a consolidated assessing unit, and it separately allows a village to be one. Most of the state settles on towns. This island did not settle on anything jointly, and the result is two neighbouring counties running the same statute in opposite directions.
Nassau: one county office, one roll
The Nassau County Department of Assessment establishes values for land and improvements as the basis for property taxes, publishes tentative and final assessment rolls year by year, and is staffed by a County Assessor at 240 Old Country Road in Mineola. Nassau’s towns do not do this work. The Town of North Hempstead states it directly: its Receiver of Taxes does not set your property tax assessment. The Town of Hempstead’s own department directory offers no assessor at all, only a Receiver of Taxes. A challenge in Nassau does not go to a town board either; it goes to the county’s Assessment Review Commission, which North Hempstead describes as an independent, quasi-judicial body separate from the Department of Assessment, on an application filed between the second of January and the first of March.
There is a third layer inside Nassau that catches researchers who stop at the county. North Hempstead notes that some incorporated villages inside the town keep their own assessment rolls for village taxes, and that a property owner in such a village has to file separately with the Village Assessor to challenge that assessment. The county’s own assessment page bears this out, listing village-level contacts including a Village of Hempstead Tax Assessor beside the town-level Receivers of Taxes. In parts of Nassau, then, the same house can appear on a county roll and on a village roll maintained by a different official, and the two are not required to agree with each other about anything except the parcel.
Suffolk: ten towns, ten assessors, no county assessor
Suffolk has no county assessing office. Its ten towns each carry the work, and the county’s own directory of towns and villages lists them: Babylon, Brookhaven, East Hampton, Huntington, Islip, Riverhead, Shelter Island, Smithtown, Southampton and Southold. Ten names, ten assessors, ten separately maintained sets of ownership data covering one county.
The scale gap between them is enormous and it matters to a search. The Town of Brookhaven Assessor’s Office, at One Independence Hill in Farmingville, determines the assessed value of more than 184,000 properties and describes itself as maintaining accurate ownership and property records while doing so. The Town of Islip Assessor’s Office, at 40 Nassau Avenue in Islip, covers more than 99,000 parcels and puts the research-relevant part in one sentence: the office continually updates ownership records through deed transfers. At the other end of the range sits Shelter Island, an island inside the island reached by ferry. A town office of that size is not a worse source than a large one; it is frequently a better one, because a small roll is thorough and the person maintaining it knows the parcels.
And two cities that answer to neither
Outside New York City, Nassau and Suffolk between them hold only two incorporated cities, both of them in Nassau, and each assesses for itself. The City of Glen Cove Department of Assessment states there are approximately 7,000 parcels of land in Glen Cove and that it determines the assessed value of each. The City of Long Beach Tax Assessor is responsible for the inspection, data collection and valuation of all real property within the city’s boundaries. Their calendars are not the county’s: Long Beach published a grievance window running from the second to the twentieth of January in 2026, while Islip’s Board of Assessment Review meets on the third Tuesday in May and Islip published Grievance Day for 2026 as the nineteenth of May.
Three different filing calendars, on one island, in the same year. New York State’s own guidance describes Grievance Day as the fourth Tuesday in May in most communities, so neither of those local dates is even the statewide default. A researcher who assumes a single Long Island assessment calendar will look for a document in the month it was never produced in.
The roll a town clerk keeps for ten years
The most under-used dated record on this island.
All that fragmentation produces one thing that a searcher should care about far more than the arguments over who values what. Every assessing unit named above generates an annual assessment roll, and New York’s Real Property Tax Law says exactly what becomes of it. On or before the first of July the assessor completes the final roll, delivers the original to the clerk of the county legislative body, and files a certified copy in the office of the city or town clerk. Notice of completion is published in the official newspaper, and in towns a copy of that notice goes up on the signboard at the entrance to the town clerk’s office. Then comes the sentence that does the work: the certified copy of the final assessment roll must be retained in the office of the city or town clerk as a public record for a minimum of ten years from the date it was filed.
Read that as a research instruction rather than as administrative housekeeping. In any Long Island town or city, the local clerk is statutorily holding roughly a decade of annual, parcel-by-parcel snapshots naming who was assessed for what. That is a dated sequence, not a single current snapshot, and a dated sequence is what turns a stale file into a timeline. It is the same discipline that underlies rebuilding a person’s address history from records rather than from a database’s guess, and here the statute has done half the archiving for you.
What the roll is dated to, and what it is not
Being precise about what the roll asserts is what stops it being misused. New York’s Department of Taxation and Finance sets out the assessment calendar: Taxable Status Date falls on the first of March in most communities and is also the deadline for exemption applications; the tentative roll is made public around the first of May, and within ten days of that it must be available from the municipality’s own website. Crucially, the assessments published on the tentative and final rolls are based on the property’s condition and ownership as of Taxable Status Date.
So an entry on the roll is a statement about ownership on a specific, known date. It is not a statement that anyone slept in the building. The assessed owner may be an estate, a trust, a company or a person who moved out years ago and kept the house, and the mailing address on the tax bill may be a third party’s office. We report it as what it is – an ownership assertion carrying a date and a custodian – and we say so in the file rather than letting a client read it as proof of residence. Establishing whether a person holds property at all is a different question from establishing where they sleep, and conflating them is how confident wrong answers get produced.
The exemption codes are the closer signal
Where the roll does lean towards occupancy is in its exemption entries, and this is the part most searchers never look at. The exemptions administered by these offices are conditional, and some of the conditions are residential. New York’s School Tax Relief benefit is tied to the property being the owner’s primary residence – the state’s guidance tells a new homeowner to register as soon as the home becomes their primary residence. Senior-citizen, disability and veterans exemptions carry their own eligibility conditions, and every assessing office named on this page administers them: Brookhaven describes reviewing and administering exemption applications under state law, Glen Cove and Long Beach both list veterans and senior exemptions, and Islip’s Town Board raised the income ceiling for its senior-citizen and disability exemptions from $29,000 to $50,000 in October 2022.
An exemption on a parcel is therefore an assertion someone made, under stated conditions, on a dated application to a named public office. That is a materially stronger signal than a commercial data record with no provenance, and it is checkable. It still is not proof, and we do not present it as proof. What we do is name the office, name the roll year, and let the strength of the inference be visible to the person reading the report.
Which office on this island holds which record
The routing table, county by county and layer by layer.
| What you need | Nassau County | Suffolk County | The layer underneath |
|---|---|---|---|
| Recorded deeds and mortgages | Nassau County Clerk, Mineola Online search | Suffolk County Clerk, imaged 1987 onward | Neither county shares an index with the other. |
| Search a land record by address | Not offered as a published search category | Yes – address is a listed search option | Condominiums need the tax map number instead. |
| Before a deed can be recorded | No county mapping checkpoint | Tax map verification required by law first | Real Property Tax Service Agency, Riverhead. |
| Who values the parcel | Nassau County Department of Assessment | The town assessor – ten separate offices | Glen Cove and Long Beach assess their own. |
| Where a grievance goes | Assessment Review Commission, Jan 2 to Mar 1 | The town’s Board of Assessment Review in May | Village assessments are challenged separately. |
| The annual final roll | Completed by July 1; certified copy filed with the city or town clerk and kept ten years. | ||
| Court case files | The county clerk, who is also clerk of the supreme and county courts. | Same statute, separately in each county. | |
Read down any column and the reason a single national lookup underperforms here becomes plain. One subject can be documented by a county clerk, a county mapping agency, a town assessor, a village assessor and a city assessor, five custodians who never merge their files and who publish on five schedules. Pulling those into one sourced answer, with each finding attributed to the office that produced it, is what our skip tracing work consists of, and on this island the assembly is most of the job. For the rest of the state, our New York coverage overview sets out how other counties are organised.
“Long Island” is three different places
The naming problem that sends searches to the wrong county entirely.
Almost no other metro has a name this ambiguous, and the ambiguity is not academic – it routes real searches into the wrong jurisdiction. Three separate meanings of the phrase collide:
- The federal metropolitan division named for these two counties is Nassau County and Suffolk County, and that is the footprint this page covers.
- The geographic island is larger than that. It carries two New York City boroughs on its western end, which are covered by the city’s own record system and are not treated here at all.
- Long Island City is a neighbourhood in Queens. It is not in Nassau, it is not in Suffolk, and it is not served by either county clerk.
That third one is not a hypothetical. Search the open web for Long Island skip tracing and a large share of what comes back is written for Long Island City, because the phrase is a substring of the neighbourhood’s name and the ranking systems cannot separate them. A client who has already made that mistake arrives believing they need Nassau or Suffolk when the subject’s paperwork is in a city office, or the reverse. It costs weeks.
The correction is cheap if you make it first. Establish which county the subject’s documented life actually sat in before choosing an index, because there is no shared search that spans both counties and the city. Nassau will not answer for Suffolk, Suffolk will not answer for Nassau, and neither answers for anything west of the county line. A negative result from one of them means only that this index did not show it, and we write our findings that way, with the index named and the coverage stated, so a blank can be interpreted rather than mistaken for an absence.
Six Nassau and Suffolk searches that come back half-complete
The recurring failures we are usually hired to undo.
The Long Island City Detour
Weeks spent on a Queens neighbourhood for a subject who lives in Suffolk.
Asking Nassau For A Town Assessor
A request sent to a town office that has never set an assessment.
One County Searched, Not Two
A Suffolk index treated as if it answered for Nassau, or the reverse.
Only The Imaged Years
A Suffolk chain assumed complete when the online images begin in 1987.
The Village Nobody Checked
An incorporated village keeping its own roll while the county roll is read instead.
A Roll Read As A Residence
An assessed owner reported as an occupant, with no date and no condition attached.
How an island file gets routed
County, then custodian, then the layer under it, then the limits.
Settle Which County
Nassau, Suffolk or neither, decided before a single index is opened.
Work The Right Clerk
The county clerk’s recorded index, searched on that county’s own terms.
Go Down To The Roll
Town, city or village assessment records, read across years rather than once.
Report With The Dates On
Every finding tied to an office, a roll year and a status date, gaps named.
What this firm is, and what it turns down
Set out before you engage us, not discovered afterwards.
This is a public-records research practice. Several of the results competing for this query in Nassau and Suffolk open by advertising an investigator’s licence, and that is a different regulated trade sold to a different buyer. Nobody on this team holds a private investigator’s licence in New York or anywhere else, and we correct any client who assumes otherwise. What stands in its place is knowing which of the offices described above holds the document, and opening lawfully licensed data only inside a permissible purpose that is established before the first search runs. No surveillance is conducted. Nothing is obtained by pretexting – no one on this team will pose as a relative, a neighbour, a landlord, a town employee or a clerk’s office to talk information out of anybody. The contents of private financial accounts are outside what we touch, and an instruction to reach into them ends an engagement rather than beginning one.
The consumer-reporting boundary belongs on the record explicitly, because this page has just spent several thousand words explaining how much of a Long Island household is written into a public roll. We are not a consumer reporting agency and what we produce is not a consumer report. Nothing we supply may be used, in whole or in part, in any decision the Fair Credit Reporting Act governs: screening a tenant or a rental application, hiring, promotion, retention or any other employment decision, credit eligibility or credit terms, insurance underwriting, or professional licensing. Long Island landlords and employers who come to us to locate someone who has already gone are welcome, and we do that work regularly. What we will not do is hand back a research file to be used as the basis of a screening decision. If that is the purpose, the correct route is a properly regulated screening provider running a compliant, disclosed process, and we will say so plainly instead of taking the money.
Where we decline, and why the answer is not negotiable
Everything above describes an island where a person’s address history is legible to anyone willing to read a town clerk’s cabinet. That legibility cuts both ways, and the counterweight has to be as concrete as the method. New York operates an Address Confidentiality Program through the Department of State for survivors of domestic violence: it provides a substitute mailing address in place of a home, school or work address, forwards mail free of charge, and accepts legal notices on a participant’s behalf. The program exists for people who have moved somewhere their abuser does not know about. It exists, in other words, to close precisely the trail this page has just described, and looking for a way around it is not work this firm accepts under any framing.
Where a request reads as an attempt to reach a person who deliberately put distance between themselves and the requester, we decline it. Somebody who is hard to find is very often hard to find on purpose, and that is a decision they were entitled to make. A request of that shape gets more scrutiny at intake than an ordinary one, not less, and the indicators are treated as disqualifying rather than as objections to be talked past: a stated reason that falls apart under one follow-up question; no court process, no attorney and no filing anywhere behind the request; urgency attached to the street address itself rather than to the underlying matter; any protective order, family-offence proceeding or history of domestic violence in the background; or an unwillingness to say plainly who the client is. When the answer is no, we give the reason, we do not refer the work onward to somebody less careful, and the file closes there.
The other limits are simpler. Where the matter is a judgment, we can locate a person and identify recorded real property in Nassau or Suffolk; the enforcement instruments and the question of what a judgment actually reaches belong to your attorney. Where the matter is service, our output is a verified address an authorised server can act on – this firm does not serve papers, and whether service was properly effected is a question for the court and for counsel, never for us. Everything on this page is general information about public records in New York and is not legal advice.
Who sends us work from Nassau and Suffolk
Clients holding a name and needing the right office.
Island Litigation Counsel
Parties and witnesses split across two county clerks
Enforcement Attorneys
Debtors and recorded parcels on either side of the line
Surrogate’s Court Practices
Heirs and distributees scattered off the island
Title And Closing Teams
Owners behind a tax map parcel in either county
Landlords And Managers
Former residents who left a Nassau or Suffolk address
Separated Relatives
Family members lost between towns or across the county line
These clients already hold the name. What they are missing is the routing – which county documented this person, whether the trail ran through a town assessor or a village one, whether the parcel was ever recorded at all, and whether the last credible date is two years old or twelve. Send us the name, whichever address you still partly trust, any identifying detail already in your file, and the purpose the search serves. Most workable Nassau or Suffolk requests get a first read back within 24 hours. A file that has to be walked across several years of town rolls takes longer, and it takes longer because those rolls are being read rather than assumed.
Named office, named roll year, stated limit
Every finding comes back attached to the office that produced it and the year it belongs to, so you can tell a current record from a decade-old one without asking. Where an index starts partway through history, you get the start date beside the result instead of a confident blank. Where the honest answer is that a record does not reach, the report says which record and how far, in words rather than by omission. Locating and verifying is the part we own. The legal steps that follow it are yours and your attorney’s. Lawful records research since 2004, on an established permissible purpose, with no pretexting at any point and no attempt to open anybody’s private accounts.
Nassau and Suffolk: the questions we get asked
Does Long Island mean Nassau and Suffolk, or does it include Queens and Brooklyn?
For this page it means Nassau County and Suffolk County, which together form the federal metropolitan division named for them. The geographic island is bigger and carries two New York City boroughs on its western end, and those are served by the city’s own record system rather than by either county clerk. Long Island City is a third thing again – a neighbourhood in Queens, not a place in Nassau or Suffolk. That name overlap sends a large share of open-web searches to the wrong jurisdiction, so we settle which county a subject was actually documented in before opening any index.
Which office holds deeds and mortgages in Nassau and in Suffolk?
Each county’s own County Clerk, and the two are entirely separate operations. New York’s County Law makes a county clerk the register as well as the clerk of the supreme court and the county court for that county, so recorded instruments and court case files sit with the same custodian. The Nassau County Clerk’s public counter is at 240 Old Country Road in Mineola and the office states that Nassau land documents can be searched online. Suffolk runs its own imaging system and its own search. Neither answers for the other, and neither draws on any city office.
How far back does the Suffolk County Clerk’s online land record search go?
The office states that its online site carries land records recorded and imaged into the Suffolk County Clerk’s imaging system from 1987 to the present, describing the collection as approximately 2.5 million documents. That is a real coverage limit and it matters: a chain of title that predates 1987 is not absent, it is simply outside the imaged set, and treating an empty online result as proof of nothing having happened is one of the more common errors on a Suffolk file. We record which index was searched and what period it covers so a blank result can be read correctly.
Can you search a Long Island land record by street address?
In Suffolk, yes. The county clerk’s online search lists address as one of its search options alongside property tax map identifier, last name or corporation, liber and page, index number, UCC number and business name. That is unusual – most recording offices in the country index by party name only. The office does note one exception in its own instructions: a condominium cannot be found by property address and requires the exact tax map number, which it tells you to obtain from the town assessor’s office for the town the property sits in.
Who is the assessor for Hempstead, Islip or Brookhaven?
Those three do not have the same answer, which is the single most useful thing to know about this island. Islip and Brookhaven each run their own Assessor’s Office, because Suffolk has no county assessor and its ten towns each assess for themselves. Hempstead does not – Nassau County assesses countywide through its Department of Assessment, and Nassau’s towns run a Receiver of Taxes instead. The Town of North Hempstead states outright that its Receiver of Taxes does not set your assessment. Some incorporated villages in Nassau also keep their own rolls with their own Village Assessor.
Can an assessment roll tell you who currently lives at an address?
Not by itself, and we will not report it that way. New York’s assessment calendar bases the tentative and final rolls on the property’s condition and ownership as of Taxable Status Date, the first of March in most communities. That makes a roll entry a dated statement about ownership, not about occupancy – the assessed owner may be a trust, an estate, a company or someone who moved out and kept the house. Exemption entries lean closer, because benefits like the state’s School Tax Relief are tied to the property being the owner’s primary residence. We give you the entry, the office, the roll year and the strength of the inference.
Why does recording a deed in Suffolk take an extra step?
Because a county mapping office checks it first. The Suffolk County Real Property Tax Service Agency states that its Tax Map Division is the sole authority for creating and maintaining the county’s tax maps, and that verification – the procedure keeping each tax map parcel’s information current – is required by law before documents can be recorded. Nassau has no equivalent county checkpoint. The practical consequence for research is that the tax map identifier, not the address, is the reliable key to a Suffolk parcel, and the agency’s Riverhead office holds an owner index alongside the maps.
Are you licensed private investigators, and can I use this to screen a tenant?
No to both. In New York or elsewhere; this is public-records research carried out under a permissible purpose established before any search begins, with no surveillance and no pretexting at any stage.. And this firm is not a consumer reporting agency, so what we produce is not a consumer report and cannot lawfully be used for tenant screening, a rental application, employment, credit, insurance or professional licensing. Locating a former tenant who has already left is different work and we do it often. Screening someone requires a regulated provider and a compliant process.
Name the town. We will name the roll.
Tell us who you are looking for, the last Long Island address you have any confidence in, and the purpose behind the search. The subject gets placed in Nassau or Suffolk first, the correct county clerk’s index is worked second, the assessment layer beneath it is read across years rather than glanced at, and what comes back to you carries the office, the date and the limit in writing. Contact us to open a Nassau or Suffolk file.
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