County Maps US

Olmsted County, Minnesota

A county in Minnesota, ranked 7 of 87 by population.

CountyFIPS 27109

Within Minnesota
Olmsted 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
166,731
+3,676 (+2.3%) since 2020
Land area
653.5
square miles. A further 0.2% of the total area is water
Population density
255
people per square mile, computed rather than published
County seat
Rochester
Seat of county government.
Established
1855
170 years ago
Largest city
Rochester city
Population 124,292.

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 Olmsted 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 Olmsted County, Minnesota 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 674 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 Olmsted County ranks

Position among the 87 counties of Minnesota, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn MinnesotaNationally
Population166,7317th of 87423rd of 3,144
Land area653.5 sq mi46th of 871,440th of 3,144
Population density255 per sq mi8th of 87492nd of 3,144
Median household income$95,40611th of 87218th of 3,143

Full data for Olmsted County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population166,731Vintage 2025 Population Estimates
Population in 2020163,055Vintage 2025 Population Estimates
2020 estimates base?162,855Vintage 2025 Population Estimates
Land area653.5 sq mi2025 Gazetteer Files
Water area1.2 sq mi2025 Gazetteer Files
Total area654.8 sq mi2025 Gazetteer Files
Population density?255 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$95,406American Community Survey 2020-2024 5-Year Estimates
Median home value$331,700American Community Survey 2020-2024 5-Year Estimates
Median age37.8American Community Survey 2020-2024 5-Year Estimates
Households66,918American Community Survey 2020-2024 5-Year Estimates
Housing units71,151American 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
+653
1,956 births, 1,303 deaths
Net migration
+287
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 Olmsted 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
Wabasha CountyMinnesota29 mi21,537
Dodge CountyMinnesota25 mi21,376
Fillmore CountyMinnesota19 mi21,540
Winona CountyMinnesota18 mi50,523
Mower CountyMinnesota13 mi40,971
Goodhue CountyMinnesota6.4 mi48,195

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

All 87 counties of Minnesota

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

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