County Maps US

Ontario County, New York

A county in New York, ranked 25 of 62 by population.

CountyFIPS 36069

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

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Population
113,130
+663 (+0.6%) since 2020
Land area
644
square miles. A further 2.8% of the total area is water
Population density
176
people per square mile, computed rather than published
County seat
Canandaigua
Seat of county government.
Established
1789
236 years ago
Largest city
Geneva city
Population 12,489 for the whole place, which extends beyond this county.

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 Ontario 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 Ontario 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 800 by 782 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 Ontario 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
Population113,13025th of 62567th of 3,144
Land area644 sq mi34th of 621,476th of 3,144
Population density176 per sq mi25th of 62612th of 3,144
Median household income$82,32415th of 62497th of 3,143

Full data for Ontario County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population113,130Vintage 2025 Population Estimates
Population in 2020112,467Vintage 2025 Population Estimates
2020 estimates base?112,476Vintage 2025 Population Estimates
Land area644 sq mi2025 Gazetteer Files
Water area18.5 sq mi2025 Gazetteer Files
Total area662.5 sq mi2025 Gazetteer Files
Population density?176 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$82,324American Community Survey 2020-2024 5-Year Estimates
Median home value$222,900American Community Survey 2020-2024 5-Year Estimates
Median age44.2American Community Survey 2020-2024 5-Year Estimates
Households48,311American Community Survey 2020-2024 5-Year Estimates
Housing units53,379American 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
-240
942 births, 1,182 deaths
Net migration
+638
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 Ontario 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
Livingston CountyNew York39 mi61,438
Yates CountyNew York31 mi24,547
Wayne CountyNew York23 mi91,250
Seneca CountyNew York19 mi32,883
Monroe CountyNew York17 mi750,506
Steuben CountyNew York6.4 mi91,855

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.