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County · code 36119

Westchester CountyNew York

Westchester County, New York, covers 430.7 square miles and has its county seat in White Plains. The county was created in 1683 and named after Chester.

  • Founded1683
  • County seatWhite Plains
  • Named forChester, England
  • Land area431 sq mi + 69 sq mi water
  • Population1,004,457 2020 Census
  • Parcels mapped37,492 checked 14 October 2026
Open the free map Click any parcel in Westchester County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

RocklandPutnamBronxBergen, NJFairfield, CTNassauOrange White Plains Census outline · seat marked

Where it is

Westchester 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.

Albany CountyAllegany CountyBronx CountyBroome CountyCattaraugus CountyCayuga CountyChautauqua CountyChemung CountyChenango CountyClinton CountyColumbia CountyCortland CountyDelaware CountyDutchess CountyErie CountyEssex CountyFranklin CountyFulton CountyGenesee CountyGreene CountyHamilton CountyHerkimer CountyJefferson CountyKings CountyLewis CountyLivingston CountyMadison CountyMonroe CountyMontgomery CountyNassau CountyNew York CountyNiagara CountyOneida CountyOnondaga CountyOntario CountyOrange CountyOrleans CountyOswego CountyOtsego CountyPutnam CountyQueens CountyRensselaer CountyRichmond CountyRockland CountySt. Lawrence CountySaratoga CountySchenectady CountySchoharie CountySchuyler CountySeneca CountySteuben CountySuffolk CountySullivan CountyTioga CountyTompkins CountyUlster CountyWarren CountyWashington CountyWayne CountyWyoming CountyYates CountyWestchester County Westchester
Counties of New York · Westchester highlighted

History

Founded in 1683

An old deed may name a county that no longer exists, or a boundary that has since moved.

Westchester was created from Yorkshire in 1683. It gained territory from Fairfield, Connecticut in 1683 when the provincial boundary was adjusted, and gained Hart Island, City Island, Manursing Island, and other small islands in Long Island Sound in 1768. The county lost territory to New York in 1874 and 1895, and a small area to Bronx in 1917.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries.

  1. 1683
    Westchester County created Westchester created from Yorkshire, which had been organized in New York in 1664. · N.Y. Col. Laws, ch. 4/1:122
  2. 1683
    Gained territory Westchester gained from Fairfield (Connecticut) when the provincial boundary between Connecticut and New York was adjusted; Fairfield (Connecticut) eliminated from New York.
    from Fairfield (Conn.)
    · Bowen, 73-74; Van Zandt, 72-73
  3. 1768
    Gained territory Westchester gained all of Non-County Area 3 (Hart Island, City Island, Manursing Island, and other small islands in Long Island Sound); Non-County Area 3 eliminated. · N.Y. Col. Laws, ch. 1376/4:1063
  4. 1874
    Lost territory Westchester lost to New York.
    to New York
    · N.Y. Laws 1873, 96th sess., ch. 613, sec. 1/p. 928
  5. 1895
    Lost territory Westchester lost to New York.
    to New York
    · N.Y. Laws 1895, 118th sess., ch. 934, sec. 1/p. 1948
  6. 1917
    Lost territory Westchester lost small area to Bronx.
    to Bronx
    · N.Y. Laws 1917, 140th sess., ch. 664, sec. 1/p. 2022
  7. 1950
    Boundary clarified Boundary between Westchester and Bronx was redefined (no change).
    with Bronxno change
    · N.Y. Laws 1950, 173d sess., ch. 650/p. 1508

Land and parcels

What the maps cover in Westchester

Who publishes each layer, how good it is, and when we last checked.

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

Westchester by the Census

Population
1,004,457 2020 Census count
Housing units
388,963 2020 Census count
Land area
431 square miles
Water area
69 square miles
People per sq mi
2,332 population ÷ land area

Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.

See your own lot on these maps

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Questions

Common questions about Westchester County

When was Westchester County founded?
Westchester County was founded in 1683, and named after Chester, England.
What is the county seat of Westchester County?
The county seat of Westchester County is White Plains.
Is there an online parcel map for Westchester County?
Yes. Westchester County publishes a parcel map of 37,492 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Westchester County's boundary or name changed?
Westchester County was created in 1683. Since then the Atlas of Historical County Boundaries records 5 later changes, chiefly involving New York County, Bronx County and Fairfield (Conn.) County.
Is my lot in a flood zone?
We do not have flood maps for Westchester County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby

Counties next door