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Johnson County, KS Demographics

Johnson County, KS is the most populous of 105 counties in Kansas, with 609,863 residents across 474 square miles. That is about 1,288 people per square mile.

At the 2020 census

Population 609,863
Land area 474 sq mi
Density 1,288 / sq mi

Data: 2020 Census · American Community Survey 2024

How Johnson 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: Johnson County, KS

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

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

Census tracts in Johnson County, KS

Name Population Sq mi Per sq mi
Census Tract 528.05 8,151 8.5 955
Census Tract 538.01 7,613 29.7 256
Census Tract 526.13 7,250 2.5 2,924
Census Tract 533.02 7,138 2.5 2,818
Census Tract 535.09 6,878 2.0 3,476
Census Tract 534.27 6,759 3.6 1,886
Census Tract 526.08 6,418 5.4 1,192
Census Tract 537.09 6,376 3.2 1,996
Census Tract 519.04 6,318 1.5 4,104
Census Tract 526.10 6,246 3.9 1,588
Census Tract 530.10 6,081 1.5 4,074
Census Tract 535.08 6,072 1.5 3,968
Census Tract 528.06 6,063 1.6 3,802
Census Tract 526.09 5,982 7.7 778
Census Tract 529.08 5,692 1.5 3,792
Census Tract 532.03 5,649 2.2 2,570
Census Tract 516 5,640 2.0 2,758
Census Tract 518.05 5,577 1.8 3,162
Census Tract 519.09 5,547 1.0 5,295
Census Tract 535.07 5,530 1.0 5,621
Census Tract 535.10 5,506 1.0 5,521
Census Tract 536.04 5,454 1.0 5,403
Census Tract 534.11 5,452 2.0 2,719
Census Tract 534.23 5,436 1.6 3,369
Census Tract 534.26 5,435 2.3 2,315
Census Tract 518.06 5,390 1.7 3,178
Census Tract 527.01 5,383 16.5 326
Census Tract 524.10 5,222 1.6 3,177
Census Tract 537.07 5,214 1.3 4,071
Census Tract 530.09 5,206 1.7 3,105
Census Tract 533.01 5,193 3.2 1,644
Census Tract 518.04 5,173 1.6 3,216
Census Tract 537.11 5,066 17.5 290
Census Tract 500 5,065 1.4 3,581
Census Tract 529.06 4,954 1.1 4,690
Census Tract 523.04 4,943 1.5 3,267
Census Tract 530.07 4,908 1.0 4,840
Census Tract 534.14 4,907 1.1 4,344
Census Tract 504 4,896 1.9 2,546
Census Tract 534.30 4,896 2.0 2,443
Census Tract 530.08 4,863 1.0 4,811
Census Tract 523.05 4,856 2.0 2,463
Census Tract 534.18 4,832 2.0 2,415
Census Tract 528.04 4,831 5.5 872
Census Tract 528.07 4,830 3.9 1,245
Census Tract 507 4,821 1.4 3,523
Census Tract 524.21 4,788 1.1 4,472
Census Tract 524.19 4,785 1.0 4,822
Census Tract 524.22 4,758 1.1 4,451
Census Tract 517 4,754 1.9 2,540
Census Tract 509 4,728 1.4 3,321
Census Tract 537.12 4,722 22.5 210
Census Tract 534.29 4,712 2.2 2,151
Census Tract 531.02 4,647 1.4 3,299
Census Tract 529.05 4,589 1.4 3,171
Census Tract 506 4,565 1.5 3,064
Census Tract 529.07 4,545 1.2 3,940
Census Tract 513 4,526 1.0 4,493
Census Tract 538.04 4,504 25.9 174
Census Tract 524.16 4,492 1.0 4,651
Census Tract 535.60 4,444 2.0 2,182
Census Tract 501 4,389 1.0 4,365
Census Tract 518.03 4,331 1.0 4,329
Census Tract 519.02 4,326 0.9 4,892
Census Tract 529.10 4,318 3.2 1,330
Census Tract 534.28 4,293 2.0 2,124
Census Tract 534.15 4,267 1.0 4,216
Census Tract 531.08 4,204 0.8 5,189
Census Tract 512 4,190 1.0 4,172
Census Tract 534.21 4,173 1.0 4,138
Census Tract 531.01 4,163 1.5 2,781
Census Tract 518.01 4,159 1.5 2,705
Census Tract 528.03 4,137 0.7 5,520
Census Tract 503.01 4,127 0.9 4,828
Census Tract 515 4,115 0.9 4,384
Census Tract 534.13 4,082 1.0 4,265
Census Tract 538.03 4,079 22.0 185
Census Tract 524.14 4,018 1.0 3,979
Census Tract 534.03 3,998 1.0 3,984
Census Tract 534.17 3,978 1.0 3,927
Census Tract 532.02 3,942 1.1 3,734
Census Tract 518.07 3,867 1.0 3,838
Census Tract 523.07 3,860 1.6 2,346
Census Tract 531.10 3,845 0.9 4,515
Census Tract 519.07 3,825 0.6 6,847
Census Tract 534.09 3,810 2.1 1,829
Census Tract 535.06 3,790 1.0 3,766
Census Tract 510 3,763 0.8 4,685
Census Tract 502 3,759 0.9 4,018
Census Tract 530.06 3,744 0.8 4,935
Census Tract 535.02 3,667 0.7 4,958
Census Tract 530.04 3,656 1.4 2,633
Census Tract 520.06 3,614 0.8 4,774
Census Tract 535.59 3,605 1.9 1,890
Census Tract 522.01 3,598 1.3 2,706
Census Tract 523.06 3,571 3.0 1,194
Census Tract 524.15 3,542 0.8 4,449
Census Tract 511 3,525 1.0 3,504
Census Tract 523.08 3,521 1.9 1,871
Census Tract 524.18 3,483 0.4 7,886

Showing the 100 most populous of 154 — 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 →