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Where am ILOCATED

Douglas County, Colorado

Douglas County, Colorado, has 399,396 residents (July 2025 estimate). Its county seat is Castle Rock. It uses Mountain Time and covers 841 sq mi (2,178 km²) of land.

DenverColorado SpringsAurora
Douglas County in Colorado
Highlands RanchCastle RockParker
Douglas County and its neighbors (simplified outlines). Open in OpenStreetMap ↗
Resident population, July 2025
399,396
Land area
841 sq mi (2,178 km²)
County seat or government
Castle Rock
Time zone
Mountain TimeUTC-07:00 in January; UTC-06:00 in July
Median household income
$149,594 ± $2,519
Median home value
$713,600 ± $5,715
Median rent, with utilities
$2,193 ± $33
Homes lived in by their owners
77.4% ± 0.7 points
County type
County
Metro or micro area
Denver-Aurora-Centennial, CO metro areaCentral county
Water area
2.62 sq mi (6.8 km²)
State
Colorado
County code (FIPS)
08035
Coordinates (central point)
39.325414, -104.925987
Open this point in the location finder

These coordinates mark a central point for the area, not a street address. Income, home value, rent and homes lived in by their owners: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 13, 2026.

Time zones in Douglas County

Time zoneLocal time and UTC offsetNext clock change
Mountain TimeAmerica/DenverUTC-07:00 in January; UTC-06:00 in July. Enable JavaScript for the live clock.Enable JavaScript for upcoming changes.

Near a time-zone line, check where you are with the time-zone finder. Your phone’s setting can differ.

ZIP Code areas, largest first

  1. 8013480,302 people
  2. 8001668,268 people
  3. 8012644,882 people
  4. 8010438,479 people
  5. 8013836,895 people
  6. 8011236,816 people
  7. 8010836,730 people
  8. 8012930,223 people
  9. 8012029,725 people
  10. 8010928,400 people
  11. 8013024,719 people
  12. 8012422,555 people
All 19
  1. 8012515,630 people
  2. 8010715,102 people
  3. 801185,632 people
  4. 801165,132 people
  5. 801064,455 people
  6. 801354,141 people
  7. 80131276 people

19 ZIP Code areas overlap Douglas County. People counts are 2020–2024 estimates for each whole ZIP area. Mailing ZIPs can differ; check an address with USPS ZIP Code Lookup.

Official county information

We don’t have a website for this county yet. The US government’s local-office directory ↗ lists its offices. A geographic lookup cannot determine eligibility, tax liability or a court obligation.

School districts in Douglas County, largest first

  1. Douglas County School District RE-1380,487 people

Districts with land in the county; a district can cross county lines. People counts are American Community Survey 2020–2024 5-year estimates. A district boundary doesn’t decide which school a student attends.

Cities, towns and communities, largest first

These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.

  1. Aurora, Colorado (city)394,432 people
  2. Highlands Ranch, Colorado (CDP)102,257 people
  3. Castle Rock, Colorado (town)79,123 people
  4. Parker, Colorado (town)61,783 people
  5. Littleton, Colorado (city)44,710 people
  6. Lone Tree, Colorado (city)14,147 people
  7. Castle Pines, Colorado (city)13,388 people
  8. The Pinery, Colorado (CDP)11,871 people
  9. Roxborough Park, Colorado (CDP)9,085 people
  10. Stonegate, Colorado (CDP)8,906 people
  11. Meridian, Colorado (CDP)5,634 people
  12. Castle Pines Village, Colorado (CDP)4,436 people
All 24
  1. Sterling Ranch, Colorado (CDP)4,213 people
  2. Sierra Ridge, Colorado (CDP)3,663 people
  3. Stepping Stone, Colorado (CDP)3,137 people
  4. Meridian Village, Colorado (CDP)2,699 people
  5. Acres Green, Colorado (CDP)2,639 people
  6. Perry Park, Colorado (CDP)1,570 people
  7. Grand View Estates, Colorado (CDP)567 people
  8. Franktown, Colorado (CDP)472 people
  9. Louviers, Colorado (CDP)294 people
  10. Westcreek, Colorado (CDP)237 people
  11. Larkspur, Colorado (town)131 people
  12. Sedalia, Colorado (CDP)37 people

Bordering areas, nearest first

Distances are straight lines between map points.

  1. Jefferson County, Colorado24 mi northwest
  2. Teller County, Colorado34 mi southwest
  3. Arapahoe County, Colorado39 mi northeast
  4. El Paso County, Colorado40 mi southeast
  5. Elbert County, Colorado43 mi east

Before using this answer on a form

Use a precise point for address-level questions. A device accuracy circle can cross a boundary; confirm tax, voting or jury details with the responsible office.

Find the county where you are now, check its ZIP area, or check the time zone where you are.

See this county on Census.gov ↗

Areas that only touch the edge

These areas meet the boundary only along a sliver. Most addresses here are not in them; for an address near the line, check with the county.