Larimer County, Colorado
County seat: Fort Collins · Population 377,292 (2025) · 2,596 sq mi
Larimer County is the 8th most populous of Colorado's 64 counties, with 377,292 people (2025 estimate). Its county seat is Fort Collins. It is part of the Region 2: Northern Front Range region, one of the 14 Planning and Management Regions of Colorado. The map shows its 8 cities and towns and the 6 neighboring counties.
Larimer County facts
- County seat
- Fort Collins
- Population (2025 estimate)
- 377,292 +5.1% since 2020
- Land area
- 2,596 sq mi 9th largest of 64
- Water area
- 38 sq mi
- Population density
- 145 per sq mi
- Established
- 1861
- Named after
- William Larimer, Jr. American politician (1809-1875)
- Largest city
- Fort Collins 171,500
- Median household income
- $93,765
- Cities and towns
- 8 plus 2 CDPs
- ZIP codes
- 24
- Time zone
- Mountain
- FIPS code
- 08069
Cities and towns in Larimer County
Larimer County has 8 incorporated cities, towns and villages. Populations count the people living inside Larimer County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Fort Collins (county seat) | City | 171,500 | |
| Loveland | City | 81,387 | |
| Berthoud | Town | 13,816 | Weld County |
| Wellington | Town | 12,169 | |
| Timnath | Town | 11,592 | Weld County |
| Windsor | Town | 9,289 | Weld County |
| Johnstown | Town | 6,267 | Weld County |
| Estes Park | Town | 5,780 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Laporte | 1,771 | |
| Red Feather Lakes | 365 |
ZIP codes in Larimer County
24 ZIP codes reach into Larimer County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 80503 also Boulder County
- 80504 also Weld and Boulder counties
- 80512
- 80513 also Weld and Boulder counties
- 80515
- 80517
- 80521
- 80524 also Weld County
- 80525
- 80526
- 80528
- 80532
- 80534 also Weld County
- 80535
- 80536
- 80537 also Weld County
- 80538
- 80540 also Boulder County
- 80545
- 80547
- 80549 also Weld County
- 80550 also Weld County
- 80612 also Weld County
- 82063
Population of Larimer County, 2020–2025
Larimer County grew by 18,223 people (+5.1%) between April 2020 and July 2025: 1,637 more births than deaths and a net gain of 16,237 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 359,942 |
| 2021 | 362,865 |
| 2022 | 367,972 |
| 2023 | 371,192 |
| 2024 | 374,200 |
| 2025 | 377,292 |
Neighboring counties
- Weld County east · 378,426 people
- Jackson County west · 1,211 people
- Albany County, Wyoming north · 38,558 people
- Boulder County south · 328,560 people
- Grand County southwest · 16,496 people
- Laramie County, Wyoming northeast · 102,938 people
Printable Larimer County map
The PDF is a vector file with real text: it prints sharp on Letter paper and you can search it for a town. The PNG is 2400 pixels wide for slides and documents. Both are free to use with a credit to WhichCounty.
- PDF (Letter) (89 KB)
- PNG (2400 px) (72 KB)
Paste this code to embed the map on your site:
Sources
- Boundaries: U.S. Census Bureau, 2025 Cartographic Boundary Files (1:500,000).
- Population: Census Bureau county and city estimates, Vintage 2025. CDP populations: American Community Survey 2020–2024.
- Places and ZIP codes: Census Bureau 2026 Gazetteer and 2020 ZIP Code Tabulation Area relationship files.
- County seat, founding year and name origin: Wikidata (CC0), checked against state sources.
Back to the Colorado county map with all 64 counties. Found an error? Tell us.