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Polk County, IA Demographics

Polk County, IA is the most populous of 99 counties in Iowa, with 492,401 residents across 572 square miles. That is about 860 people per square mile.

At the 2020 census

Population 492,401
Land area 572 sq mi
Density 860 / sq mi

Data: 2020 Census · American Community Survey 2024

How Polk 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: Polk County, IA

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

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

Census tracts in Polk County, IA

Name Population Sq mi Per sq mi
Census Tract 102.16 16,172 8.3 1,954
Census Tract 101.02 11,046 52.0 212
Census Tract 102.14 9,299 3.0 3,078
Census Tract 102.05 7,864 4.4 1,789
Census Tract 115 7,785 40.3 193
Census Tract 113.03 7,426 7.5 992
Census Tract 108.05 7,148 3.7 1,952
Census Tract 106.02 7,142 6.6 1,079
Census Tract 102.15 7,047 7.3 960
Census Tract 51.01 7,040 1.7 4,141
Census Tract 110.27 6,809 2.6 2,608
Census Tract 114.06 6,751 7.0 970
Census Tract 46.02 6,661 1.5 4,425
Census Tract 117.03 6,601 2.1 3,179
Census Tract 107.02 6,600 68.0 97
Census Tract 105 6,297 14.9 423
Census Tract 102.09 6,225 1.5 4,074
Census Tract 8.01 6,094 1.7 3,686
Census Tract 107.08 5,990 5.2 1,145
Census Tract 101.01 5,925 134.0 44
Census Tract 110.26 5,644 2.6 2,204
Census Tract 39.02 5,481 2.9 1,869
Census Tract 108.04 5,390 16.6 324
Census Tract 112.01 5,332 1.5 3,667
Census Tract 110.28 5,322 15.9 335
Census Tract 107.03 5,264 2.2 2,397
Census Tract 111.11 5,205 1.4 3,846
Census Tract 108.03 5,021 2.0 2,547
Census Tract 113.04 4,972 4.4 1,132
Census Tract 4 4,754 0.8 6,055
Census Tract 102.13 4,744 4.8 984
Census Tract 11 4,744 0.7 6,476
Census Tract 43 4,723 1.1 4,210
Census Tract 21 4,718 0.9 5,359
Census Tract 110.21 4,705 1.0 4,844
Census Tract 10 4,688 0.8 6,177
Census Tract 104.04 4,682 1.1 4,314
Census Tract 5 4,641 0.8 5,950
Census Tract 102.07 4,531 1.5 3,067
Census Tract 104.11 4,501 1.0 4,436
Census Tract 3 4,440 2.6 1,730
Census Tract 107.09 4,423 1.8 2,467
Census Tract 104.07 4,418 1.6 2,838
Census Tract 108.06 4,389 15.2 289
Census Tract 102.08 4,379 1.0 4,186
Census Tract 19 4,371 1.3 3,246
Census Tract 113.01 4,278 5.3 809
Census Tract 47.01 4,272 2.4 1,776
Census Tract 104.09 4,248 1.1 3,889
Census Tract 111.12 4,217 1.4 3,050
Census Tract 102.12 4,190 2.4 1,722
Census Tract 44 4,170 0.9 4,635
Census Tract 45.01 4,092 0.7 5,457
Census Tract 111.14 4,048 1.5 2,638
Census Tract 29 4,045 0.6 6,719
Census Tract 6 4,023 1.1 3,601
Census Tract 8.03 3,998 1.0 4,198
Census Tract 1.02 3,971 0.6 6,401
Census Tract 104.08 3,943 1.0 4,144
Census Tract 117.02 3,906 3.5 1,124
Census Tract 107.07 3,892 4.3 915
Census Tract 102.11 3,871 1.5 2,527
Census Tract 104.06 3,870 3.7 1,051
Census Tract 27 3,857 0.7 5,662
Census Tract 40.01 3,809 3.9 987
Census Tract 110.25 3,791 0.9 4,025
Census Tract 39.01 3,784 1.3 2,990
Census Tract 2.02 3,743 0.9 4,296
Census Tract 50 3,717 0.6 6,359
Census Tract 112.05 3,669 0.9 4,076
Census Tract 46.03 3,667 1.0 3,681
Census Tract 112.06 3,657 1.9 1,946
Census Tract 112.03 3,628 1.9 1,956
Census Tract 1.01 3,569 0.9 3,923
Census Tract 7.01 3,537 0.9 3,852
Census Tract 110.01 3,527 0.8 4,535
Census Tract 12 3,494 0.5 6,427
Census Tract 8.02 3,453 0.7 5,086
Census Tract 9.01 3,417 0.6 5,483
Census Tract 7.02 3,397 1.4 2,462
Census Tract 30.02 3,354 1.0 3,528
Census Tract 9.02 3,303 1.0 3,412
Census Tract 40.04 3,245 2.5 1,313
Census Tract 28 3,210 0.5 6,074
Census Tract 52 3,207 2.0 1,641
Census Tract 7.04 3,197 0.7 4,282
Census Tract 113.05 3,193 0.8 4,079
Census Tract 42 3,147 0.8 3,850
Census Tract 41 3,135 1.7 1,891
Census Tract 7.03 3,134 0.8 3,795
Census Tract 113.02 3,128 2.7 1,154
Census Tract 48 3,055 0.6 5,542
Census Tract 47.02 2,990 1.5 1,988
Census Tract 114.05 2,970 12.5 238
Census Tract 32 2,902 0.9 3,278
Census Tract 15 2,865 0.7 4,126
Census Tract 17 2,824 0.6 4,848
Census Tract 117.04 2,719 2.0 1,377
Census Tract 2.01 2,676 0.7 3,584
Census Tract 53 2,633 5.0 523

Showing the 100 most populous of 112 — 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.

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