Douglas County, Colorado
County seat: Castle Rock · Population 399,396 (2025) · 840 sq mi
Douglas County is the 6th most populous of Colorado's 64 counties, with 399,396 people (2025 estimate). Its county seat is Castle Rock. It is part of the Region 3: Denver Metropolitan Area region, one of the 14 Planning and Management Regions of Colorado. The map shows its 7 cities and towns and the 5 neighboring counties.
Douglas County facts
- County seat
- Castle Rock
- Population (2025 estimate)
- 399,396 +11.6% since 2020
- Land area
- 840 sq mi 47th largest of 64
- Water area
- 3 sq mi
- Population density
- 475 per sq mi
- Established
- 1861
- Same name
- One of 12 Douglas Counties in the US
- Named after
- Stephen A. Douglas American politician and lawyer (1813–1861)
- Largest city
- Highlands Ranch 102,257
- Median household income
- $149,594
- Cities and towns
- 7 plus 17 CDPs
- ZIP codes
- 18
- Time zone
- Mountain
- FIPS code
- 08035
Cities and towns in Douglas County
Douglas County has 7 incorporated cities, towns and villages. Populations count the people living inside Douglas County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Castle Rock (county seat) | Town | 83,815 | |
| Parker | Town | 65,985 | |
| Castle Pines | City | 15,583 | |
| Lone Tree | City | 15,278 | |
| Aurora | City | 4,285 | Adams and Arapahoe counties |
| Littleton | City | 625 | Arapahoe and Jefferson counties |
| Larkspur | Town | 219 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Highlands Ranch | 102,257 | |
| The Pinery | 11,871 | |
| Roxborough Park | 9,085 | |
| Stonegate | 8,906 | |
| Meridian | 5,634 | |
| Castle Pines Village | 4,436 | |
| Sterling Ranch | 4,213 | |
| Sierra Ridge | 3,663 | |
| Stepping Stone | 3,137 | |
| Meridian Village | 2,699 | |
| Acres Green | 2,639 | |
| Perry Park | 1,570 | |
| Grand View Estates | 567 | |
| Franktown | 472 | |
| Louviers | 294 | |
| Westcreek | 237 | |
| Sedalia | 37 |
ZIP codes in Douglas County
18 ZIP codes reach into Douglas County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 80016 also Arapahoe County
- 80104
- 80106 also Elbert and El Paso counties
- 80108
- 80109
- 80112 also Arapahoe County
- 80116
- 80118
- 80120 also Arapahoe County
- 80124
- 80125 also Jefferson County
- 80126
- 80129 also Arapahoe County
- 80130
- 80131
- 80134
- 80135 also Jefferson County
- 80138 also Elbert County
Population of Douglas County, 2020–2025
Douglas County grew by 41,403 people (+11.6%) between April 2020 and July 2025: 9,446 more births than deaths and a net gain of 32,201 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 360,315 |
| 2021 | 369,831 |
| 2022 | 376,188 |
| 2023 | 384,579 |
| 2024 | 393,051 |
| 2025 | 399,396 |
Neighboring counties
- Jefferson County northwest · 580,451 people
- Elbert County east · 30,534 people
- Arapahoe County northeast · 673,820 people
- El Paso County southeast · 757,040 people
- Teller County southwest · 24,756 people
Printable Douglas 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) (114 KB)
- PNG (2400 px) (82 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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