Nassau County occupies the western portion of Long Island, bordered by Queens County to the west and Suffolk County to the east. With an estimated 1.4 million residents, it is the most densely populated suburban county in New York State and one of the most densely populated in the country. Its population is concentrated across dozens of small incorporated villages and unincorporated communities — Hempstead, Uniondale, Levittown, Hicksville, Garden City, Great Neck, and Mineola among the larger ones. High homeownership rates and relatively stable long-term residency make Nassau County address databases more reliable than those in the NYC boroughs, but the close physical and demographic connection to Queens means cross-borough address histories are common.
Nassau County operates its own unified Supreme Court system, separate from New York City's five borough court systems. The Nassau County Supreme Court at the Mineola courthouse handles felony criminal matters, major civil litigation, matrimonial cases, and probate. Nassau County District Court handles misdemeanors, violations, and civil matters under $15,000 — a court tier that does not exist within New York City's five boroughs. For the broader New York context including the Clean Slate Act and DOCCS, see our New York state guide.
Key takeaways
- Nassau County has an estimated 1,395,774 residents (U.S. Census Bureau, 2023 ACS) — the most densely populated suburban county in New York State, with relatively stable address databases compared to the NYC boroughs.
- Nassau County Supreme Court (Mineola) handles felony criminal matters, major civil litigation, matrimonial, and probate. Nassau County District Court handles misdemeanors and lower civil matters — a separate court tier not found inside New York City.
- Many Nassau County residents have prior address histories in Queens County. Queens OCA searches are a standard parallel check for Nassau subjects who moved from the city.
- New York's Clean Slate Act (effective November 16, 2024) seals eligible misdemeanor records after three years and felonies after eight years — Nassau criminal gaps will grow over time as more records become eligible.
Nassau County quick facts
- Population estimate (2023): approximately 1,395,774 (U.S. Census Bureau, 2023 ACS)
- County seat: Mineola
- Largest community: Hempstead (est. pop. 55,000, incorporated village)
- State: New York
- Primary courts: Nassau County Supreme Court (felonies, major civil, matrimonial); Nassau County District Court (misdemeanors, lower civil)
Population estimates from the U.S. Census Bureau.
How to search Nassau County records
Run OCA e-Courts with Nassau County selected for Supreme Court history
Nassau County Supreme Court records are accessible through the OCA e-Courts portal at iapps.courts.state.ny.us with Nassau County selected as the jurisdiction. The portal covers felony criminal cases, major civil matters, matrimonial cases, and probate. Unlike NYC boroughs where the Supreme Court and Criminal Court are separate OCA selections, Nassau's structure routes felony matters through Supreme Court and misdemeanors through the District Court — two separate court tiers, each requiring their own OCA selection. For state prison history, DOCCS at doccs.ny.gov provides a free statewide lookup before committing to the $95 OCA statewide criminal history report. Our court record search guide covers New York's suburban versus NYC court structure differences.
Add Nassau County District Court for misdemeanor and lower civil history
Nassau County District Court handles misdemeanors, violations, and civil matters under $15,000. It is the equivalent of what NYC boroughs handle through their Criminal Court and Civil Court portals, but Nassau's version is called District Court. OCA access to Nassau District Court records is available through the same iapps.courts.state.ny.us portal with the appropriate Nassau District Court selection. For a complete Nassau County criminal history, both the Supreme Court and District Court searches are required. Skipping District Court means missing all misdemeanor history. See our criminal record search guide for context on the Nassau two-tier structure.
Check Queens County OCA for subjects with prior NYC address history
Nassau County's western border with Queens County produces significant cross-borough address history among residents who relocated from the city. Subjects who moved from Queens, Brooklyn, or other NYC boroughs to Nassau County carry all their prior court records in those borough systems. Nassau County OCA searches will not return NYC borough records regardless of how long the person previously lived there. For Nassau subjects with a Queens or Brooklyn prior address — common in the more affordable eastern Nassau communities like Hempstead, Freeport, and Valley Stream — running the relevant NYC borough's OCA alongside Nassau is the complete approach. Our find someone by name and city guide covers how to trace the prior-address chain before choosing which portals to run.
Official record sources in Nassau County
| Record type | Agency | Online access | Notes |
|---|---|---|---|
| Supreme Court criminal and civil records (felonies, major civil, matrimonial) | OCA e-Courts — Nassau County | iapps.courts.state.ny.us | Select Nassau County. Covers Supreme Court cases. Does not include District Court misdemeanors — those require a separate OCA selection. Clean Slate Act sealing applies. |
| District Court records (misdemeanors, lower civil) | OCA — Nassau County District Court | iapps.courts.state.ny.us | Separate OCA selection from Supreme Court. Required for complete criminal history. Nassau District Court is the equivalent of NYC Criminal Court for misdemeanor matters. |
| Civil judgments, liens, property filings | Nassau County Clerk | nassaucountyny.gov/clerk | Nassau County Clerk maintains civil judgment indexes and recorded real property documents. Free online access for indexes; certified copies require fee. |
| Property records and deeds | Nassau County Clerk — Land Records | nassaucountyny.gov/clerk | Nassau County Clerk maintains deed recordings and land transfer records. Separate from the NYC ACRIS system used in the five boroughs — Nassau has its own land records portal. |
| Marriage records (from 1908), vital records | Nassau County Clerk / NY State DOH | nassaucountyny.gov/clerk and health.ny.gov/vital_records | Nassau County Clerk holds local marriage certificates. NY State DOH maintains a statewide index from 1880 forward — separate from NYC DOHMH which covers only the five boroughs. |
| State prison history | DOCCS | doccs.ny.gov | Free statewide lookup for NY State prison history. Run before the $95 OCA statewide fee. |
For a broader overview of how New York's public records systems work outside the five NYC boroughs, see our public record search guide.
Marriage records in Nassau County
Nassau County marriage records are held by the Nassau County Clerk, not by NYC DOHMH (which only covers the five NYC boroughs) and not solely by New York State DOH. This is a distinction worth knowing: residents who moved from the NYC boroughs to Nassau County may have marriage records split between NYC DOHMH (for a borough marriage) and the Nassau County Clerk (for a marriage after the move). The Nassau County Clerk holds local vital records including marriage certificates from 1908 forward. New York State DOH maintains a statewide vital records index from 1880 forward at health.ny.gov/vital_records — this is the upstate and suburban index, separate from the NYC system.
Marriage licenses for Nassau County residents are issued by the town or city clerk in the municipality where the license was obtained — there are three towns in Nassau County (Hempstead, North Hempstead, Oyster Bay) plus two cities (Glen Cove and Long Beach). For certified copies, contact the issuing municipality. For a full guide to how marriage record searches work across all states, see our marriage record search guide.
Divorce records in Nassau County
Divorce cases in New York are filed in Supreme Court in the county where either party resides. Nassau County Supreme Court handles Nassau divorce filings, and case indexes are searchable through OCA e-Courts with Nassau County selected. New York requires at least one year of state residency before filing in most circumstances. Full divorce documents require contact with the Nassau County Clerk at the Mineola courthouse.
Nassau County's high homeownership rate and stable residential population mean that divorce filing addresses are generally more reliable here than in the NYC boroughs. For subjects who were married in a NYC borough before moving to Nassau, the marriage record may be at NYC DOHMH while the divorce filing is in Nassau County Supreme Court. For a full guide to how divorce record searches work across all states, see our divorce record search guide.
Industry insight
Nassau County is where the NYC-to-suburb address chain creates the most consistent prior-record problem. The Queens-Nassau border is the busiest suburban migration corridor in New York State. Many Hempstead, Valley Stream, and Elmont residents have prior Queens County records from before the move, and Queens OCA produces nothing in a Nassau County search. I run Queens alongside Nassau as a default for subjects in those western Nassau communities — it saves going back later when the Nassau search comes up thin.
The two-tier court structure is the other thing worth knowing before starting. Nassau District Court for misdemeanors is not the same as Nassau Supreme Court, and the OCA portal requires separate selections. I see researchers run the Supreme Court selection, get a clean result, and call it complete. A clean Supreme Court result means no felony history in Nassau — it says nothing about the District Court misdemeanor record. Both selections are required for a complete picture.
Common mistakes when searching in Nassau County
- Treating a clean Nassau Supreme Court OCA result as a complete criminal history — District Court misdemeanor records require a completely separate OCA selection. A felony-clean result does not mean no criminal history exists in Nassau County.
- Not running Queens County OCA for subjects with prior NYC address history — Nassau's western communities (Valley Stream, Elmont, Hempstead, Freeport) have significant populations that relocated from Queens. Prior court and property records stayed in Queens and will not appear in Nassau County searches.
- Looking for Nassau marriage records through NYC DOHMH — NYC DOHMH covers only the five NYC boroughs. Nassau County marriage records are at the Nassau County Clerk and, for older records, through New York State DOH at health.ny.gov/vital_records. Using the wrong system produces nothing.
- Overlooking Nassau's incorporated village and town structure — Nassau County has 70 incorporated villages within its three towns. Some records (building permits, local ordinance violations) sit at the village or town level rather than the county level. For deep address-history verification, the relevant town or village clerk is a supplemental source the county clerk cannot replace.
Crime statistics and public-safety context
Nassau County has one of the lowest violent crime rates of any large suburban county in the United States. Its affluent communities along the North Shore (Great Neck, Manhasset, Garden City) report very low rates across all crime categories. Communities in the southern part of the county, including Hempstead, Roosevelt, and Freeport, report higher rates that more closely resemble urban patterns. Overall, Nassau County's crime profile is substantially below the national average for counties of comparable population. New York State Division of Criminal Justice Services statistics for 2023 showed Nassau County's violent crime rate among the lowest of any New York county. Source: NY Division of Criminal Justice Services, Crime and Justice Annual Report 2023.
Major communities in Nassau County
Hempstead
Hempstead (est. pop. 55,000 — U.S. Census Bureau, 2023 ACS) is the largest incorporated village in Nassau County and one of the largest in New York State. Its population is predominantly Black and Latino, with significant Central American and Caribbean communities. Hempstead generates more court filing volume per capita than most Nassau communities and has a closer demographic and records profile to the NYC outer borough communities than to Nassau's suburban average. Spanish surname variant checking is relevant for Hempstead searches.
Garden City
Garden City (est. pop. 23,000 — U.S. Census Bureau, 2023 ACS) is one of Nassau County's most affluent planned communities, adjacent to Mineola where the Nassau County courthouse is located. Its stable, high-income residential population generates minimal criminal court filings and above-average civil and matrimonial filings. Address histories in Garden City are among the most stable in the county.
Great Neck
Great Neck occupies the northwestern corner of Nassau County on the North Shore, with a large Iranian Jewish and East Asian professional community. Great Neck's demographics produce name variant complexity for Persian-origin and Chinese surnames in records searches. Many Great Neck residents work in Manhattan and maintain stable long-term residences — database addresses here are reliable.
Levittown
Levittown (est. pop. 51,000 — U.S. Census Bureau, 2023 ACS) is the original postwar planned community that defined Long Island's suburban character. Its working-class to middle-class population has relatively stable long-term residency compared to NYC boroughs. Levittown straddles the Nassau-Suffolk county border in some areas — addresses near the border should be confirmed for county assignment before running court portals.
Valley Stream and Elmont
Valley Stream and Elmont are in the southwestern corner of Nassau County, directly adjacent to Queens. Both communities have large Jamaican, Haitian, and other Caribbean immigrant populations — and both are primary destinations for residents relocating from Queens. Prior Queens County records for Valley Stream and Elmont subjects are common, making a parallel Queens OCA search the standard approach rather than an optional supplement.
Common search scenarios
Searching by name and city in Nassau County
Nassau County address databases are more reliable than NYC borough databases because of higher homeownership rates and longer average residency tenure. An aggregator search typically returns more reliable current addresses here than in the city. Use the specific community name — not just "Long Island" — to route the search correctly. For communities along the Queens border (Valley Stream, Elmont, Hempstead), check whether prior Queens addresses appear and run Queens OCA in parallel. See our guide on finding someone by name and city.
Checking Nassau County court records
OCA e-Courts Nassau County for Supreme Court felony and civil matters, then OCA Nassau County District Court for misdemeanor history. DOCCS for state prison history before the $95 OCA statewide fee. Nassau County Clerk for civil judgment and land records. Both court tiers must be searched for a complete Nassau County criminal history. See our court record search guide.
Searching for former NYC residents who moved to Nassau
For any Nassau County subject whose address history shows a prior NYC borough address, running that borough's OCA alongside Nassau is the complete approach. Queens is the most common origin; Brooklyn is second. Prior records stayed in the borough where they were filed and will not appear in Nassau County OCA results. A name and relative search surfaces the prior-borough address chain quickly before committing to portal searches.
Start Here: Enter Any Name To View Records
Best sites to review first
Before moving into Nassau County's court portals, these are the two services I recommend reviewing first — identifying prior-borough address history before choosing which OCA selections to run saves significant time.
| Service | Why people use it | Best fit |
|---|---|---|
| Instant Checkmate | Surfaces prior NYC borough address history and current Nassau community — useful for confirming whether Queens or Brooklyn OCA searches are needed alongside Nassau | Prior-borough identification and Nassau community address verification |
| TruthFinder | Broader address history across NYC boroughs and Nassau County — useful for subjects with multi-stop relocation histories from city to suburb | Multi-location address chain searches for former NYC residents now in Nassau |
Important: These services are not FCRA-compliant consumer reporting agencies. Do not use them for employment screening, tenant decisions, insurance underwriting, or any other purpose regulated by the Fair Credit Reporting Act.
Frequently asked questions
What is the difference between Nassau County Supreme Court and District Court for records searches?
Nassau County Supreme Court handles felony criminal matters, major civil cases, matrimonial cases, and probate. Nassau County District Court handles misdemeanors, violations, and civil matters under $15,000. They are separate court tiers requiring separate OCA portal selections. A clean Supreme Court result means no Nassau County felony history — it says nothing about the District Court misdemeanor record. Both searches are required for a complete Nassau County criminal history picture.
Can you look up marriage or divorce records in Nassau County?
Yes. Nassau County marriage records are held by the Nassau County Clerk and by the town or city clerk in the municipality where the license was issued. Nassau has three towns (Hempstead, North Hempstead, Oyster Bay) and two cities (Glen Cove, Long Beach) — marriages are recorded at the town or city clerk level. New York State DOH maintains a statewide index from 1880 forward at health.ny.gov/vital_records for informational lookups. Divorce case indexes are accessible through OCA e-Courts with Nassau County selected at no cost.
How do I find property records for Nassau County?
The Nassau County Clerk at nassaucountyny.gov maintains recorded property documents including deeds, mortgages, and liens with online access by grantor/grantee name or address. Nassau County is also covered by the NYS Real Property System through the Nassau County Assessor's office for ownership and assessment data. NYC ACRIS does not cover Nassau County — ACRIS covers only the five NYC boroughs.
Why should I check Queens County records for a Nassau County search?
Western Nassau County communities — Valley Stream, Elmont, Hempstead, Freeport, Lynbrook — are natural relocation destinations for Queens residents who leave the city for Long Island. Prior Queens court records stay in the Queens OCA system and will not appear in a Nassau search. For any Nassau County subject with a Queens prior address, running OCA with Queens County selected alongside the Nassau search is standard rather than optional.
What is New York's Clean Slate Act and how does it affect Nassau County searches?
New York's Clean Slate Act, effective November 16, 2024, seals eligible criminal records automatically — misdemeanors after three years following sentence completion, felonies after eight years. Sealed records do not appear in OCA searches. Nassau County criminal history gaps in OCA will accumulate over time as qualifying records are sealed. DOCCS at doccs.ny.gov provides a free statewide prison history lookup for individuals currently or recently incarcerated in New York State facilities.
Does Nassau County have town or village courts separate from the county courts?
Yes. Nassau County has numerous town and village justice courts that handle local violations and petty offenses. These justice courts are separate from Nassau County District Court and Supreme Court, and their records require contacting the specific town or village court directly. OCA's justice court portal can provide some access, but coverage is not uniform across all Nassau justice courts. For traffic and local violation matters originating in a specific town or village, contacting that locality's court is the most reliable approach.
Can I use these searches for jobs, housing, or insurance decisions?
No. The services discussed on this page are not consumer reporting agencies and the information here is not a consumer report. They should not be used for employment, tenant screening, insurance underwriting, credit, or any other purpose regulated by the Fair Credit Reporting Act.
Other New York county guides
- Suffolk County (eastern Long Island)
- Westchester County
- Queens County
- Kings County (Brooklyn)
- New York County (Manhattan)
- Bronx County
Browse all county guides: People Search by County
