County Maps US

Monroe County, New York

A county in New York, ranked 9 of 62 by population.

CountyFIPS 36055

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

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Population
750,506
-7,878 (-1.0%) since 2020
Land area
657
square miles. A further 51.9% of the total area is water
Population density
1,142
people per square mile, computed rather than published
County seat
Rochester
Seat of county government.
Established
1821
204 years ago
Largest city
Rochester city
Population 206,108.

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 Monroe 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 Monroe 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 757 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 Monroe 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
Population750,5069th of 6291st of 3,144
Land area657 sq mi30th of 621,431st of 3,144
Population density1,142 per sq mi10th of 62140th of 3,144
Median household income$76,38222nd of 62755th of 3,143

Full data for Monroe County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population750,506Vintage 2025 Population Estimates
Population in 2020758,384Vintage 2025 Population Estimates
2020 estimates base?759,385Vintage 2025 Population Estimates
Land area657 sq mi2025 Gazetteer Files
Water area709.8 sq mi2025 Gazetteer Files
Total area1,367 sq mi2025 Gazetteer Files
Population density?1,142 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$76,382American Community Survey 2020-2024 5-Year Estimates
Median home value$213,700American Community Survey 2020-2024 5-Year Estimates
Median age39.6American Community Survey 2020-2024 5-Year Estimates
Households318,428American Community Survey 2020-2024 5-Year Estimates
Housing units339,430American 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
-77
7,181 births, 7,258 deaths
Net migration
+240
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 5 areas bordering Monroe 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
Wayne CountyNew York41 mi91,250
Orleans CountyNew York34 mi39,825
Livingston CountyNew York25 mi61,438
Genesee CountyNew York17 mi58,416
Ontario CountyNew York17 mi113,130

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.