Lake County, Colorado
County seat: Leadville · Population 7,552 (2025) · 377 sq mi
Lake County is the 41st most populous of Colorado's 64 counties, with 7,552 people (2025 estimate). Its county seat is Leadville. It is part of the Region 13: Central Mountains region, one of the 14 Planning and Management Regions of Colorado. The map shows its 1 city or town and the 5 neighboring counties.
Lake County facts
- County seat
- Leadville
- Population (2025 estimate)
- 7,552 +1.6% since 2020
- Land area
- 377 sq mi 61st largest of 64
- Water area
- 7 sq mi
- Population density
- 20 per sq mi
- Established
- 1861
- Same name
- One of 12 Lake Counties in the US
- Named after
- Twin Lakes census-designated place in Lake County, Colorado, United States
- Largest city
- Leadville 2,668
- Median household income
- $96,575
- Cities and towns
- 1 plus 2 CDPs
- ZIP codes
- 2
- Time zone
- Mountain
- FIPS code
- 08065
Cities and towns in Lake County
Lake County has 1 incorporated place. Populations count the people living inside Lake County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Leadville (county seat) | City | 2,668 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Leadville North | 1,417 | |
| Twin Lakes | 615 |
ZIP codes in Lake County
2 ZIP codes reach into Lake County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 80461
- 81251
Population of Lake County, 2020–2025
Lake County grew by 120 people (+1.6%) between April 2020 and July 2025: 238 more births than deaths and a net loss of 119 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 7,409 |
| 2021 | 7,404 |
| 2022 | 7,387 |
| 2023 | 7,424 |
| 2024 | 7,471 |
| 2025 | 7,552 |
Neighboring counties
- Pitkin County west · 16,625 people
- Park County east · 18,314 people
- Chaffee County south · 20,831 people
- Eagle County northwest · 54,291 people
- Summit County north · 31,517 people
Printable Lake 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) (63 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.
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