County · code 36103
Suffolk CountyNew York
Suffolk County is in New York, with its county seat in Riverhead. It was created in 1683 from Yorkshire.
- Founded1683
- County seatRiverhead
- Named forSuffolk, England
- Land area911 sq mi + 1,462 sq mi water
- Population1,525,920 2020 Census
- Parcels mapped584,939 checked 14 October 2026
Where it is
Suffolk on the map of New York
New York has 62 counties and county equivalents, each with its own records office. Shapes with a page are links.
History
Founded in 1683
An old deed may name a county that no longer exists, or a boundary that has since moved.
Suffolk County was created in 1683 from Yorkshire, which had been organized in New York in 1664. In 1886, Suffolk County gained territory from Queens when the town of Huntington acquired Lloyd's Neck from the town of Oyster Bay.
- 1683Suffolk County created Suffolk created from Yorkshire, which had been organized in New York in 1664. · N.Y. Col. Laws, ch. 4/1:122
- 1860Boundary clarified Boundary between Suffolk and Queens was redefined (no change).with Queensno change· N.Y. Laws 1860, 83d sess., ch. 530/pp. 1074-1076
- 1886Gained territory Suffolk gained from Queens when town of Huntington gained Lloyd's Neck from town of Oyster Bay. · N.Y. Laws 1886, 109th sess., ch. 667/pp. 956-957
Land and parcels
What the maps cover in Suffolk
Who publishes each layer, how good it is, and when we last checked.
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Parcels Good enough
Lot lines and tax-map numbers for 584,939 parcels from Suffolk County. Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
checked 14 October 2026 -
Address points Official
One point per address, 596,806 in all from NYS Office of Information Technology Services (ITS), Geospatial Services / GIS Program Office (AGOL org 'ShareGIS NY', owner NYSGIS_GPO).
edited 25 September 2026 · checked 14 October 2026 -
Buildings Reference
Roof outlines traced from aerial imagery from FEMA Response Geospatial Office with Oak Ridge National Laboratory (ORNL). Good for seeing what is on a lot; not accurate enough to set a fence from.
checked 18 October 2026
- Official
- from the office that keeps the record
- Good enough
- a reliable statewide or national copy
- Fallback
- a guide only; check the official record
- Missing
- nothing public found yet
People and land
Suffolk by the Census
Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.
Rules and offices
Who to ask before you build, dig or sell
Official county pages only. We link to them; we do not copy them, because they change.
Inside a city or town, permits usually come from that city rather than the county.
County government
- County government
The official website of Suffolk County.
See your own lot on these maps
Open Suffolk County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.
Questions
Common questions about Suffolk County
- When was Suffolk County founded?
- Suffolk County was founded in 1683, and named after Suffolk, England.
- What is the county seat of Suffolk County?
- The county seat of Suffolk County is Riverhead.
- Is there an online parcel map for Suffolk County?
- Yes. Suffolk County publishes a parcel map of 584,939 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has Suffolk County's boundary or name changed?
- Suffolk County was created in 1683. Since then the Atlas of Historical County Boundaries records 1 later change, chiefly involving Queens County.
- Is my lot in a flood zone?
- We do not have flood maps for Suffolk County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby