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Jefferson County, CO Demographics

Jefferson County, CO is the 4th most populous of 64 counties in Colorado, with 582,897 residents across 764 square miles. That is about 763 people per square mile.

At the 2020 census

Population 582,897
Land area 764 sq mi
Density 763 / sq mi

Data: 2020 Census · American Community Survey 2024

How Jefferson 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: Jefferson County, CO

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

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

Census tracts in Jefferson County, CO

Name Population Sq mi Per sq mi
Census Tract 605.01 10,399 10.9 957
Census Tract 98.37 7,944 8.5 937
Census Tract 117.24 7,559 3.6 2,112
Census Tract 102.09 6,637 1.0 6,729
Census Tract 103.08 6,507 1.9 3,447
Census Tract 98.27 6,305 1.7 3,719
Census Tract 104.02 6,187 1.6 3,980
Census Tract 120.45 6,017 1.1 5,347
Census Tract 120.43 5,878 1.8 3,216
Census Tract 102.08 5,804 1.2 5,032
Census Tract 120.57 5,783 1.5 3,913
Census Tract 117.26 5,767 2.2 2,660
Census Tract 120.24 5,750 3.1 1,852
Census Tract 117.02 5,730 1.0 5,782
Census Tract 110 5,707 1.5 3,776
Census Tract 120.41 5,682 1.2 4,691
Census Tract 103.03 5,634 1.2 4,772
Census Tract 98.33 5,601 1.0 5,719
Census Tract 98.54 5,599 5.9 957
Census Tract 120.52 5,558 0.9 5,915
Census Tract 120.22 5,540 2.0 2,755
Census Tract 105.02 5,436 2.3 2,368
Census Tract 104.03 5,434 1.6 3,447
Census Tract 98.38 5,428 1.7 3,211
Census Tract 112.02 5,424 1.5 3,605
Census Tract 604 5,420 2.0 2,683
Census Tract 118.06 5,320 1.1 4,662
Census Tract 98.28 5,315 1.6 3,322
Census Tract 118.03 5,275 0.7 7,084
Census Tract 120.39 5,272 1.0 5,385
Census Tract 109.01 5,207 1.8 2,970
Census Tract 107.02 5,187 0.6 8,045
Census Tract 98.15 5,182 2.1 2,455
Census Tract 120.35 5,161 11.5 451
Census Tract 117.20 5,147 6.0 862
Census Tract 98.46 5,060 10.6 476
Census Tract 98.24 5,044 1.0 5,030
Census Tract 105.03 4,806 1.5 3,140
Census Tract 102.13 4,751 1.1 4,436
Census Tract 101 4,736 2.7 1,748
Census Tract 103.07 4,656 0.6 8,101
Census Tract 117.01 4,653 1.5 3,123
Census Tract 98.52 4,524 3.6 1,240
Census Tract 102.12 4,512 0.9 5,139
Census Tract 603 4,512 0.7 6,330
Census Tract 98.34 4,499 0.7 6,325
Census Tract 98.23 4,495 0.7 6,486
Census Tract 119.51 4,472 1.1 3,893
Census Tract 117.32 4,466 0.5 8,731
Census Tract 158 4,384 0.9 4,916
Census Tract 117.31 4,364 5.0 869
Census Tract 117.11 4,281 0.8 5,110
Census Tract 98.06 4,266 2.2 1,914
Census Tract 116.02 4,245 0.8 5,540
Census Tract 117.08 4,199 1.0 4,337
Census Tract 117.12 4,188 0.9 4,468
Census Tract 120.47 4,180 0.7 6,247
Census Tract 107.01 4,159 0.9 4,877
Census Tract 120.54 4,139 0.9 4,563
Census Tract 120.50 4,127 1.3 3,096
Census Tract 117.10 4,113 0.7 5,510
Census Tract 118.04 4,111 0.7 5,557
Census Tract 98.36 4,106 2.4 1,721
Census Tract 100.01 4,096 2.0 2,091
Census Tract 120.44 4,057 1.6 2,591
Census Tract 115.51 4,054 0.8 4,868
Census Tract 102.06 4,053 1.2 3,254
Census Tract 98.45 4,014 16.6 241
Census Tract 120.34 3,999 8.6 465
Census Tract 98.51 3,958 1.4 2,897
Census Tract 120.58 3,955 222.9 18
Census Tract 120.42 3,935 1.0 4,002
Census Tract 114.02 3,906 0.7 5,917
Census Tract 120.55 3,877 1.0 4,073
Census Tract 120.53 3,877 0.9 4,086
Census Tract 120.30 3,842 13.2 291
Census Tract 120.49 3,840 1.0 3,780
Census Tract 117.29 3,815 0.7 5,104
Census Tract 120.31 3,779 18.5 204
Census Tract 102.10 3,739 1.1 3,460
Census Tract 117.27 3,735 1.0 3,785
Census Tract 120.36 3,729 56.6 66
Census Tract 116.01 3,728 0.7 5,018
Census Tract 117.30 3,706 0.7 4,995
Census Tract 98.40 3,705 0.7 5,012
Census Tract 120.51 3,616 1.0 3,586
Census Tract 106.03 3,607 0.8 4,806
Census Tract 120.38 3,605 1.3 2,855
Census Tract 98.35 3,584 0.7 5,000
Census Tract 103.05 3,565 0.6 5,557
Census Tract 120.26 3,495 8.9 391
Census Tract 159 3,477 2.1 1,693
Census Tract 120.37 3,466 15.5 224
Census Tract 120.23 3,453 0.8 4,225
Census Tract 117.09 3,449 0.7 5,030
Census Tract 98.42 3,434 2.5 1,359
Census Tract 98.55 3,430 2.8 1,241
Census Tract 120.59 3,428 0.8 4,561
Census Tract 111.01 3,380 1.0 3,328
Census Tract 98.58 3,358 100.5 33

Showing the 100 most populous of 146 — the rest are shown on the map.

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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 →