County Maps US

Allegany County, New York

A county in New York, ranked 49 of 62 by population.

CountyFIPS 36003

Within New York
Allegany County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks Belmont, the county seat, located via the 2025 Census Gazetteer.

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Population
46,800
+415 (+0.9%) since 2020
Land area
1,030
square miles. A further 0.5% of the total area is water
Population density
45.5
people per square mile, computed rather than published
County seat
Belmont
Seat of county government.
Established
1806
219 years ago
Largest city
Alfred village
Population 5,147.

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of Allegany County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of Allegany County, New York from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 678 by 800 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where Allegany County ranks

Position among the 62 counties of New York, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn New YorkNationally
Population46,80049th of 621,055th of 3,144
Land area1,030 sq mi16th of 62642nd of 3,144
Population density45.5 per sq mi55th of 621,563rd of 3,144
Median household income$62,86957th of 621,812th of 3,143

Full data for Allegany County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population46,800Vintage 2025 Population Estimates
Population in 202046,385Vintage 2025 Population Estimates
2020 estimates base?46,458Vintage 2025 Population Estimates
Land area1,030 sq mi2025 Gazetteer Files
Water area5.0 sq mi2025 Gazetteer Files
Total area1,035 sq mi2025 Gazetteer Files
Population density?45.5 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$62,869American Community Survey 2020-2024 5-Year Estimates
Median home value$101,700American Community Survey 2020-2024 5-Year Estimates
Median age38.7American Community Survey 2020-2024 5-Year Estimates
Households17,710American Community Survey 2020-2024 5-Year Estimates
Housing units23,540American Community Survey 2020-2024 5-Year Estimates

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths
-109
426 births, 535 deaths
Net migration
+86
More people moved in than moved out.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 6 areas bordering Allegany County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering areaStateShared borderPopulation
Cattaraugus CountyNew York36 mi75,390
Steuben CountyNew York33 mi91,855
Potter CountyPennsylvania24 mi15,897
Livingston CountyNew York20 mi61,438
Wyoming CountyNew York14 mi39,741
McKean CountyPennsylvania5.2 mi38,984

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

All 62 counties of New York

Open the interactive New York county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.