• county
  • FIPS 08035
  • Largest town: Castle Rock

Douglas County, Colorado

Douglas County had 393,995 residents in the Census Vintage 2024 estimate, on 840.9 square miles of land. It ranks 6th of 64 in Colorado by population and 47th by land area.

Population
393,995
#6 of 64 in Colorado · #194 in US
Area
840.9 sq mi
#47 of 64 in Colorado · #992 in US
Density
469 / sq mi
#5 of 64 in Colorado · #293 in US
Median household income
$144,807
#1 of 64 in Colorado · #6 in US

Census Vintage 2024 estimates · SAIPE 2023 income · 2024 Gazetteer land area

Douglas County within Colorado. Pin: Denver.

Measure from here

Tools and pages that start from Douglas County

Douglas County population, land area and income

Douglas County had 393,995 residents in the Census Vintage 2024 estimate, on 840.9 square miles of land. It ranks 6th of 64 in Colorado by population and 47th by land area. That works out to 468.5 people per square mile, 4.9 times the US average of 96.3, and in the top tenth nationally.

The median county-equivalent in Colorado has 15,336 residents, so Douglas County is 25.7 times that size.

Its SAIPE 2023 median household income of $144,807 is the 6th highest among 3,143 counties with an estimate.

National rank among 3,144

Population

393,995

3144th1st

194th of 3,144 (US)

Land area

841 sq mi

3144th1st

992nd of 3,144 (US)

Density

468.5 / sq mi

3144th1st

293rd of 3,144 (US)

Median household income

$144,807

3143rd1st

6th of 3,143 (US)

Rank within Colorado (64)

Population

393,995

64th1st

6th of 64 (CO)

Land area

841 sq mi

64th1st

47th of 64 (CO)

Density

468.5 / sq mi

64th1st

5th of 64 (CO)

Median household income

$144,807

64th1st

1st of 64 (CO)

How Douglas County's population changed since 2020

Douglas County gained 33,668 residents between the July 2020 and July 2024 estimates, a rise of 9.3%. That ranks 5th of 64 in Colorado for growth. The median Colorado county changed by +1.7%, and the state as a whole by +2.9%.

Since the April 2020 estimates base, Douglas County recorded 16,074 births and 8,650 deaths, a natural change of +7,424. Net international migration added +4,652 and net domestic migration, people moving to or from other US counties, came to +24,221. The largest single component was domestic migration, which added 24,221 people.

360.3k2020369.8k2021376.5k2022385.1k2023394.0k2024
Census Vintage 2024 county estimates for July 1 of each year. The axis starts above zero so year-to-year changes are visible.

Components of change, April 2020 to July 2024

Births
16,074
Deaths
8,650
Net international migration
+4,652
Net domestic migration
+24,221
Change, July 2023 to July 2024
+8,854

Where Douglas County is

The Census internal point of Douglas County is at 39.325400, -104.926000. It sits in UTM zone 13N. The map shades Colorado's 64 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Douglas County outlined. Dots are towns of 1,000+ people with residents in it.

Otero County: -3.6%Lake County: -0.6%Adams County: +4.3%Kit Carson County: +0.2%Phillips County: -0.9%Bent County: +5.5%Lincoln County: -1.1%Washington County: -0.9%Hinsdale County: -5.1%Alamosa County: +1.9%Kiowa County: -4.1%Arapahoe County: +1.8%Archuleta County: +5.1%Montrose County: +4.6%Jefferson County: -0.8%Gilpin County: +2.5%Larimer County: +4.1%Custer County: +17.5%Saguache County: +4.3%Mineral County: +7.1%Broomfield County: +5.1%Logan County: -2.1%Mesa County: +3.4%Eagle County: -2.4%Denver County: +1.6%Pitkin County: -4.2%Boulder County: -0.2%El Paso County: +2.6%Las Animas County: +0.1%San Miguel County: -2.9%Douglas County: +9.3%Cheyenne County: -1.9%Garfield County: +2.2%Ouray County: +6.5%San Juan County: +16.0%Yuma County: +0.8%Elbert County: +12.1%Prowers County: -0.5%Morgan County: +4.2%Delta County: +3.7%Chaffee County: +6.6%Huerfano County: +2.4%Teller County: +0.5%Costilla County: +5.3%Baca County: -3.3%Routt County: +1.6%Conejos County: +1.3%Summit County: -1.1%Clear Creek County: -3.0%Fremont County: +2.5%Rio Blanco County: +1.3%Dolores County: +5.8%Grand County: +2.6%Gunnison County: +2.1%Park County: +5.1%Sedgwick County: -5.5%Montezuma County: +3.7%La Plata County: +2.1%Moffat County: -1.0%Rio Grande County: -3.6%Weld County: +11.5%Pueblo County: +0.9%Jackson County: -7.6%Crowley County: -1.5%
Change 2020 to 2024
  1. < -1.9%
  2. < +0.5%
  3. < +2.4%
  4. < +5.1%
  5. ≥ +5.1%
no data

Orange pin: Douglas County internal point. Dark pin: Denver.

Internal point

Decimal
39.325400, -104.926000
DMS
39°19'31.44"N 104°55'33.60"W
UTM
13N 506378.3E 4352890.2N
Geohash
9wvrsqgpn
Plus code
85FQ83GF+5J

Towns in Douglas County

6 incorporated places of 1,000+ people have residents in Douglas County, 182,708 people together, or 46% of the county. Each figure counts only the part of the town inside Douglas County; towns marked "part" extend into another county. The largest is Castle Rock with 83,213.

  1. 01Castle Rock83,213
  2. 02Parker65,473
  3. 03Castle Pines15,162
  4. 04Lone Tree14,061
  5. 05Aurora (part)4,169
  6. 06Littleton (part)630
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Douglas County

The Census 2024 county adjacency file lists 5 neighbors for Douglas County. The most populous is El Paso County, CO, with 752,772 residents. Distances run between Census internal points in a straight line.

Distance to Denver and the nearest big city

Denver is 28.7 miles N of Douglas County's internal point in a straight line. The nearest place of 100,000 or more is Centennial, CO (population 108,853), 18.6 miles away. The nearest place of 10,000 or more is Castle Rock, CO (population 83,213), 5.3 miles away.

Douglas County FIPS code

The FIPS code of Douglas County is 08035: state code 08 for Colorado plus county code 035. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $144,807.

Questions people ask

What is the population of Douglas County, Colorado?

The Census Vintage 2024 estimate for July 1, 2024 is 393,995. That is up 33,668 people (9.3%) from the July 2020 estimate of 360,327.

What is the FIPS code of Douglas County?

08035. The first two digits (08) are Colorado; the last three (035) identify the county.

What is the largest town in Douglas County?

Castle Rock, with 83,213 residents inside Douglas County in 2024.

Which counties border Douglas County?

5 county-equivalents border it in the Census 2024 adjacency file: El Paso County, CO; Arapahoe County, CO; Jefferson County, CO; Elbert County, CO; Teller County, CO.

Sources and data as of

Data as of: Census Vintage 2024 population estimates, 2024 Gazetteer land area and internal points, SAIPE 2023 median household income.

  1. 01Census Vintage 2024 county population estimates
  2. 02Census 2024 Gazetteer, counties
  3. 03Census SAIPE 2023 state and county estimates
  4. 04Census Vintage 2024 subcounty population estimates
  5. 05Census 2024 county adjacency file
  6. 06Census 2024 cartographic boundary file, counties (1:5,000,000)

How every number is computed: methodology. Spotted a wrong figure? Report an error.