County Maps US

Larimer County, Colorado

A county in Colorado, ranked 8 of 64 by population.

CountyFIPS 08069

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

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Population
377,292
+17,350 (+4.8%) since 2020
Land area
2,596
square miles. A further 1.5% of the total area is water
Population density
145
people per square mile, computed rather than published
County seat
Fort Collins
Seat of county government.
Established
1861
164 years ago
Largest city
Fort Collins city
Population 171,500.

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 Larimer 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 Larimer County, Colorado 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 642 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 Larimer County ranks

Position among the 64 counties of Colorado, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn ColoradoNationally
Population377,2928th of 64207th of 3,144
Land area2,596 sq mi9th of 64205th of 3,144
Population density145 per sq mi9th of 64715th of 3,144
Median household income$93,76518th of 64238th of 3,143

Full data for Larimer County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population377,292Vintage 2025 Population Estimates
Population in 2020359,942Vintage 2025 Population Estimates
2020 estimates base?359,069Vintage 2025 Population Estimates
Land area2,596 sq mi2025 Gazetteer Files
Water area38.2 sq mi2025 Gazetteer Files
Total area2,634 sq mi2025 Gazetteer Files
Population density?145 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$93,765American Community Survey 2020-2024 5-Year Estimates
Median home value$569,100American Community Survey 2020-2024 5-Year Estimates
Median age36.8American Community Survey 2020-2024 5-Year Estimates
Households154,232American Community Survey 2020-2024 5-Year Estimates
Housing units164,690American 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
+471
3,136 births, 2,665 deaths
Net migration
+2,614
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 Larimer 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
Weld CountyColorado57 mi378,426
Jackson CountyColorado49 mi1,211
Albany CountyWyoming48 mi38,558
Boulder CountyColorado32 mi328,560
Grand CountyColorado25 mi16,496
Laramie CountyWyoming17 mi102,938

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

All 64 counties of Colorado

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

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