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Nassau County

Nassau County covers 284 square miles of southeastern New York, with the county seat at Mineola.

Open PublicGIS map Nassau County parcel map and property search

Nassau County official website

Taxes, deeds, permits and other Nassau County services on GovDir

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PublicGIS maps 407,479 parcels for Nassau County. PublicGIS does not show owner names for this county.

Where to find things

  • Nassau County parcel map and property searchCounty GIS map · Property lines · Property owner · Property records · Parcel number · Aerial imagery

    Nassau County's public map viewer. Search a property to see parcel boundaries, aerial imagery and other local map layers.

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    • New York statewide property mapNew York's statewide map of property lines (38 of 62 (public parcels); missing Allegany, Cattaraugus, Chemung, Chenango, Clinton, Columbia, Delaware, Dutchess, Essex, Franklin, Fulton, Herkimer, Jefferson, Madison, Monroe, Nassau, Niagara, Orleans, Saratoga, Schenectady, Schoharie, Seneca, Washington, Yates). Search an address or parcel to see its boundaries. Accept the terms on the first screen to open the map.
    • Sanborn Fire Insurance MapsDigitized Sanborn fire insurance maps showing building footprints, materials and uses for American towns and cities, widely used in property history and environmental research.
    • USDA NAIP Imagery HubFind and download USDA's leaf-on aerial photography for the contiguous United States. Check coverage and acquisition dates for the area you need.
  • New York GIS data downloadsGIS data downloads · Elevation · Addresses and 911 numbers

    Download New York's statewide GIS data, such as roads, boundaries, imagery and elevation and property lines.

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    • State Plane Coordinate System zonesThe official State Plane Coordinate System from the National Geodetic Survey: which zone covers each state and county, zone definitions and conversion tools.
    • FEMA National Flood Hazard Layer ViewerInteractive nationwide map of current flood zones, base flood elevations and map panels.
    • NCES School District BoundariesNational school district boundary maps and downloadable GIS files, with an address lookup for the district serving a location.
    • New York State Geological SurveyNew York geology: landslide, earthquake and ground hazards, groundwater, minerals and geologic maps.
    • USGS National Map ViewerNational base map with elevation, hydrography, imagery, boundaries and PLSS layers.
    • USGS topoViewBrowse and download every historical USGS topographic map for a location, useful for seeing old roads, buildings and shorelines.
    • US Census GeocoderFree service that converts a street address into map coordinates and census geography. No account needed.
  • Nassau County zoning referralsZoning

    How municipal zoning actions are referred to the Nassau County Planning Commission. Zoning itself is set by each city, town and village.

    Office
    Nassau County Planning Commission
    Address
    1194 Prospect Ave. Westbury, NY 11590
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  • Official source for flood insurance rate maps. Enter an address to see the current flood zone and download the FIRM panel and letters of map change.

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    • New York floodplain and flood mapsNew York's floodplain program: the flood maps, the extra rules that apply to building or rebuilding near water, and who runs the program locally.
    • FEMA Disaster DeclarationsSearch federal disaster and emergency declarations by state, county and incident to see whether an area was declared and what assistance was authorized.
    • FEMA Increased Cost of ComplianceFlood insurance coverage that helps pay to elevate, relocate, demolish or floodproof a substantially damaged building.

  • Farm wetland rules for USDA program participants. Before you drain, fill or clear a wet area in a farm field, ask NRCS at your local USDA Service Center for a wetland determination.

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  • Draw an area on the map to get soil types, drainage, septic suitability, building limitations and farmland ratings.

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  • New York's environmental agency: water quality, wetlands, waste and the permits that go with them.

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  • National land cover map for every year since 1985: forest, cropland, developed, wetland, water and change over time.

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    • National Land Cover Database (NLCD) DownloadsFilter and download National Land Cover Database products including Annual NLCD land cover for the contiguous United States. Provides downloadable raster products and links to the viewer for spatial selection.

  • State-owned land in New York: who manages it, what you may do on it, and how leases and easements work.

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  • Nassau County ClerkPlats · Surveys and section corners

    Where deeds, mortgages, easements and other land documents are recorded. Start here to search recorded documents or order a copy.

    Maureen O'Connell, County Clerk
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    • NGS survey mark and benchmark mapMap of National Geodetic Survey benchmarks and survey control marks. Zoom to a place, click a mark and open its datasheet with the mark's position, elevation and how to find it on the ground.
    • New York licensed land surveyor lookupSearch the New York State Board for Engineering, Land Surveying and Geology for a licensed land surveyor by name or license number. Only a licensed surveyor can mark a legal property line on the ground, so check a surveyor's license before you hire one.
    • BLM General Land Office RecordsSearch original federal land patents and survey plats by name or legal description to find the first private owner of a parcel.
    • NGS Survey Mark DatasheetsFederal survey mark datasheets and control monument records, searchable by county or coordinates.
  • Nassau County roads and public worksRoads

    Local roads: maintenance, right of way, access permits and road maps.

    Office
    Nassau County Public Works
    Phone
    516-571-7535
    Address
    1194 Prospect Avenue Westbury, NY 11590-2723
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    • New York State Department of TransportationState highways in New York: road maps, projects, and the approach or access permit you need before you build a driveway onto a state road.
    • 811 Before You DigCall 811 or use your state 811 center's website a few business days before any digging, including fence posts, decks, trees and mailboxes. The service is free, and the utilities mark their buried lines with paint or flags. This page lists every state's 811 center.
    • National Pipeline Mapping SystemPublic map viewer of transmission pipelines and operator contacts by county, for excavation planning and emergency response.

  • New York's coastal program: the coastal boundary, waterfront revitalisation plans and the state review of work on the shore.

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  • Nassau County hurricane evacuation zones and routesHazards and emergency information

    Nassau County OEM page with a map of hurricane evacuation zones and routes.

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    • New York landslide hazardState hazard mitigation page explaining where landslides happen in New York and why.
    • U.S. wildfire risk mapType a community, county or state to see its wildfire likelihood, risk to homes and exposure, with maps and charts. It shows long-term risk, not current fires, and is a screening tool, not an official hazard designation for a property.
    • U.S. hurricane storm surge risk mapsInteractive map of how deep storm surge flooding could get near the coast in a worst-case hurricane of each category. It does not replace your local hurricane evacuation zone; check the state or county zone lookup for that.

Nassau County offices

  • Nassau County Department of AssessmentValues all property in Nassau County for county, town and school taxes and processes property tax exemption applications such as STAR, senior and veteran exemptions.Joseph A. Adamo, County Assessor
    Phone
    516-571-1500
    Address
    240 Old Country Road, 4th Floor, Mineola, NY 11501
    Website
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  • Nassau County Environmental ServicesSeptic and environmental health permits.
    Phone
    516-227-9697
    Website
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  • Nassau County GIS and mappingNassau County Department of Information Technology keeps the maps and GIS for Nassau County.Nancy Stanton-Molaro, Commissioner
    Phone
    516-571-4265
    Website
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  • Nassau County USDA FSA and NRCS officeThe Farm Service Agency office for Nassau County is at the Riverhead Service Center, 423 Griffing Ave, Riverhead, NY 11901. Call it to sign up for the Conservation Reserve Program (CRP) and other farm programs, and for farm and tract records. The Natural Resources Conservation Service (NRCS) works from the same office: ask it for wetland determinations, highly erodible land questions and conservation plans.
    Phone
    (631) 727-5666
    Address
    423 Griffing Ave, Riverhead, NY 11901
    Website
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Guides

Other New York counties

Neighboring counties

About Nassau County

Nassau County covers 284 square miles of southeastern New York, with the county seat at Mineola. Unlike most of New York, the county assesses property here: the County Department of Assessment sets the value and handles exemptions, and the town or city tax receiver sends the bill. The County Clerk keeps recorded deeds and mortgages.

Cities in Nassau County

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