Westchester County area

Population and density of Westchester County

The Census Bureau estimates that 1,015,743 people lived in Westchester County on July 1, 2025. That ranks #50 of 3,222 county equivalents nationally and #7 of 62 in New York. Since the April 1, 2020 estimates base of 1,004,456, the population has grown by 11,287 (+1.1%), compared with −1% for New York as a whole.

With 430.8 square miles of land, that is 2,358 people per square mile (910 per km²), placing Westchester County #66 nationally for density and #7 in New York. The median county equivalent has 47 people per square mile; the New York median is 112. Put another way, there are about 0.271 acres of land per resident.

U.S. Census Bureau, Vintage 2025 population estimates. Estimates are revised each year and are not decennial census counts. Density divides the whole population by the whole county’s land area, so it describes an average, not how settlement is distributed within the county. Population sources and methods.

Cities and towns in Westchester County

Westchester County is divided into 25 cities and towns. In New York, county subdivisions are local governments, and together they cover all of the county’s land and residents.

The most populous is Yonkers city, with 212,603 residents (20.9% of the county). The largest by land is Cortlandt town, at 39.4 mi², or 9.1% of the county’s land. The county seat, White Plains city, has 62,871 residents. Among those with at least 1,000 residents in 2020, Harrison town grew fastest since then (+14.4%).

Population: U.S. Census Bureau Vintage 2025 subcounty estimates, counting only the part of each subdivision inside Westchester County. Land: 2026 Census Gazetteer. How communities are listed.

Metropolitan area

Westchester County is a central county of the New York-Newark-Jersey City, NY-NJ Metropolitan Statistical Area, in the New York-Jersey City-White Plains, NY-NJ metropolitan division. Its 22 county equivalents have 20,112,448 residents on 6,139.7 square miles of land; Westchester County accounts for 7% of the land and 5.1% of the residents. By combined land it ranks #34 of 393 metropolitan areas, and #1 by population. It belongs to the New York-Newark, NY-NJ-CT-PA Combined Statistical Area.

ZIP codes

78 ZIP Code Tabulation Areas have land in Westchester County; 74 of them have most of their land inside the county, and the others mainly cover neighboring areas.

104701050110502105031050410505105061050710509105101051110514105171051810519105201052210523105261052710528105301053210533105351053610537105381054010541105431054510546105471054810549105501055210553105601056210566105671057010573105761057710578105801058310588105891059010591105941059510596105971059810601106031060410605106061060710701107031070410705107061070710708107091071010801108031080410805

ZIP Code Tabulation Areas are the Census Bureau’s approximations of USPS ZIP Code service areas, from the 2020 Census relationship files. Lighter codes have less than half of their land in this county. Post-office-box and single-address ZIP Codes have no tabulation area.

Counties bordering Westchester County

Westchester County shares a land border with 5 county equivalents, including 2 in Connecticut and New Jersey. It has more land than 4 of them. The largest neighbor is Western Connecticut Planning Region (532.1 mi²) and the smallest is Bronx County (42.2 mi²). Together with its neighbors, Westchester County forms a block of 1,641.9 mi² of land, of which it holds 26.2%.

How big is Westchester County compared with U.S. states?

Westchester County has less land than any of the 50 states. Rhode Island, the smallest state by land area, has 1,033.9 mi², about 2.4 times as much. New York’s county land could hold about 109 areas the size of Westchester County.

Another way to picture it: the same land area would fill a square about 20.8 miles (33.4 km) on each side. Real county shapes are rarely square, so this is a scale reference rather than a width or driving distance.

State figures are the sums of each state’s county-equivalent land measurements in the same Census release, so states and counties are compared on the same basis. Published state totals can differ slightly because of rounding. Compare all states · Counties bigger than entire states.

What stands out about Westchester County?

Westchester County has more land than 862 of the other 3,221 county equivalents in the dataset.

A median is the middle county-equivalent measurement, not the average of the largest and smallest. All three bars use the same linear scale. Very small areas may appear as a thin sliver; the labels retain their values.

Does including water change its rank?

Using land plus water places Westchester County at #2,181 nationally by total area, 179 places closer to the top than its land rank. The water assigned to this geography moves it ahead of some county equivalents with more land.

Its water share is 13.9%, compared with a national county-equivalent median of 1.2% — 12.7 percentage points higher. This describes the statistical geography’s land/water mix, not flood exposure or developable land.

Closest positions in the national land ranking

These entries sit immediately beside Westchester County in the national ranking. They can be in different states and are not necessarily geographic neighbors.

Calculated from the same Census release as the area table. Total-area order uses original ALAND + AWATER; water shares and chart labels use published square miles. Calculation details.