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Douglas County, CO Demographics

Douglas County, CO is the 7th most populous of 64 counties in Colorado, with 357,978 residents across 841 square miles. That is about 426 people per square mile.

At the 2020 census

Population 357,978
Land area 841 sq mi
Density 426 / sq mi

Data: 2020 Census · American Community Survey 2024

How Douglas County compares to the US

We're computing this county's comparison table — check back shortly. Population, land area, and density above are already exact.

Central Location: Douglas County, CO

Measured from the county's main population center using 2020 census blocks.

We're computing the drive-time and radius areas around Douglas County, CO — check back shortly. Meanwhile you can drop a pin anywhere in the radius tool.

Census tracts in Douglas County, CO

Name Population Sq mi Per sq mi
Census Tract 144.10 12,675 4.2 3,024
Census Tract 140.08 11,741 2.2 5,273
Census Tract 140.13 11,075 16.0 693
Census Tract 139.10 8,222 2.0 4,121
Census Tract 144.05 7,923 3.6 2,226
Census Tract 139.12 7,399 10.5 702
Census Tract 140.06 7,394 2.2 3,302
Census Tract 141.30 7,352 1.4 5,387
Census Tract 146.03 7,165 2.5 2,823
Census Tract 140.11 7,059 11.6 609
Census Tract 145.06 6,865 77.3 89
Census Tract 139.11 6,693 14.2 472
Census Tract 142.03 6,556 7.3 903
Census Tract 139.09 6,407 24.6 260
Census Tract 141.33 6,300 1.6 3,970
Census Tract 141.16 6,184 1.5 4,028
Census Tract 139.07 6,177 2.4 2,526
Census Tract 145.03 6,166 3.6 1,699
Census Tract 141.32 6,161 1.3 4,827
Census Tract 141.31 6,142 5.2 1,188
Census Tract 141.44 6,089 3.8 1,601
Census Tract 140.10 6,009 1.7 3,600
Census Tract 141.25 5,998 6.7 898
Census Tract 141.34 5,849 1.2 4,768
Census Tract 141.35 5,818 26.0 224
Census Tract 140.16 5,719 15.2 375
Census Tract 145.04 5,656 2.5 2,273
Census Tract 145.05 5,630 5.7 987
Census Tract 139.05 5,468 1.4 3,885
Census Tract 141.41 5,447 2.9 1,884
Census Tract 141.27 5,437 2.4 2,301
Census Tract 141.40 5,433 1.5 3,591
Census Tract 141.10 5,341 1.0 5,138
Census Tract 141.24 5,276 1.0 5,205
Census Tract 140.14 4,916 3.5 1,406
Census Tract 141.46 4,896 0.6 7,606
Census Tract 141.08 4,823 1.2 4,042
Census Tract 140.05 4,761 1.0 4,731
Census Tract 140.09 4,741 1.4 3,345
Census Tract 141.28 4,581 0.8 5,731
Census Tract 146.04 4,452 25.2 177
Census Tract 139.04 4,198 2.1 2,042
Census Tract 141.39 4,142 1.4 2,863
Census Tract 141.15 4,075 1.0 4,083
Census Tract 140.15 4,074 1.0 4,147
Census Tract 141.23 4,012 2.2 1,848
Census Tract 144.09 3,918 10.2 383
Census Tract 141.07 3,812 1.1 3,595
Census Tract 141.12 3,811 0.7 5,833
Census Tract 139.14 3,757 8.3 451
Census Tract 141.45 3,684 0.6 5,679
Census Tract 141.29 3,604 0.5 6,776
Census Tract 144.07 3,595 25.9 139
Census Tract 140.07 3,425 3.8 897
Census Tract 141.14 3,370 1.2 2,796
Census Tract 140.17 3,287 3.6 913
Census Tract 139.15 3,177 2.4 1,348
Census Tract 141.43 3,153 0.6 4,937
Census Tract 141.38 2,961 0.7 4,068
Census Tract 141.13 2,953 0.5 6,048
Census Tract 141.09 2,920 0.6 4,893
Census Tract 142.05 2,913 28.3 103
Census Tract 144.04 2,669 92.0 29
Census Tract 139.13 2,660 7.2 367
Census Tract 146.02 2,616 83.0 32
Census Tract 144.08 2,553 35.9 71
Census Tract 141.26 1,887 0.3 6,830
Census Tract 141.42 1,884 2.4 779
Census Tract 142.07 1,794 0.3 7,088
Census Tract 142.08 1,509 9.8 154
Census Tract 142.06 788 21.3 37
Census Tract 143 781 190.0 4

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About this page

This page shows demographics for a US county from the 2020 census and the American Community Survey: population, land area, density, urban share, and how the county compares to national averages for income, housing, age, and more.

Counties subdivide into census tracts, listed below with their populations. The drive-time and radius tables measure the population around the county's main population center.

Read how BlockAtlas computes population within an area →