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Jefferson County, MO Demographics

Jefferson County, MO is the 7th most populous of 115 counties in Missouri, with 226,753 residents across 656 square miles. That is about 346 people per square mile.

At the 2020 census

Population 226,753
Land area 656 sq mi
Density 346 / 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, MO

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

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

Census tracts in Jefferson County, MO

Name Population Sq mi Per sq mi
Census Tract 7001.17 6,963 1.7 4,026
Census Tract 7002.08 6,784 3.1 2,157
Census Tract 7004.02 6,552 41.0 160
Census Tract 7006.05 6,429 20.9 307
Census Tract 7006.03 6,420 8.1 796
Census Tract 7006.04 6,331 25.3 250
Census Tract 7014.04 6,303 48.7 129
Census Tract 7001.18 6,219 3.0 2,099
Census Tract 7005.02 6,120 31.9 192
Census Tract 7001.20 6,096 3.5 1,748
Census Tract 7012 5,941 8.8 673
Census Tract 7009 5,810 8.8 664
Census Tract 7008.01 5,795 2.0 2,936
Census Tract 7002.06 5,692 9.4 603
Census Tract 7003.02 5,581 10.4 536
Census Tract 7008.02 5,577 4.8 1,174
Census Tract 7011.02 5,285 77.1 69
Census Tract 7002.11 5,161 7.0 733
Census Tract 7001.24 4,831 5.9 820
Census Tract 7004.01 4,769 27.3 175
Census Tract 7010.01 4,753 19.3 247
Census Tract 7003.03 4,652 2.0 2,305
Census Tract 7007 4,605 5.6 824
Census Tract 7011.01 4,506 52.6 86
Census Tract 7001.13 4,495 4.6 969
Census Tract 7001.14 4,304 4.6 927
Census Tract 7005.04 4,278 11.0 390
Census Tract 7014.01 4,093 43.6 94
Census Tract 7001.22 4,087 1.8 2,280
Census Tract 7010.02 4,072 22.9 178
Census Tract 7001.15 4,016 3.5 1,162
Census Tract 7001.21 3,887 1.8 2,199
Census Tract 7014.03 3,871 45.4 85
Census Tract 7002.10 3,853 2.4 1,609
Census Tract 7003.05 3,814 5.7 669
Census Tract 7002.09 3,760 4.3 884
Census Tract 7001.07 3,731 10.5 356
Census Tract 7001.11 3,671 2.8 1,291
Census Tract 7003.06 3,572 7.1 500
Census Tract 7002.07 3,559 6.2 574
Census Tract 7013 3,400 12.6 271
Census Tract 7005.03 3,234 19.8 163
Census Tract 7002.13 3,122 2.1 1,453
Census Tract 7001.16 3,084 0.8 3,887
Census Tract 7006.06 2,946 1.4 2,059
Census Tract 7002.12 2,927 1.3 2,232
Census Tract 7001.23 2,893 2.5 1,146
Census Tract 7006.07 2,779 6.9 405
Census Tract 7001.19 2,116 2.5 856

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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 →