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Madison County, IL Demographics

Madison County, IL is the 8th most populous of 102 counties in Illinois, with 265,859 residents across 716 square miles. That is about 372 people per square mile.

At the 2020 census

Population 265,859
Land area 716 sq mi
Density 372 / sq mi

Data: 2020 Census · American Community Survey 2024

How Madison 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: Madison County, IL

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

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

Census tracts in Madison County, IL

Name Population Sq mi Per sq mi
Census Tract 4035.33 10,554 9.2 1,145
Census Tract 4031.21 9,528 6.2 1,536
Census Tract 4035.31 8,319 9.3 892
Census Tract 4027.21 7,722 17.0 454
Census Tract 4030.02 7,212 2.6 2,770
Census Tract 4027.01 7,191 11.9 605
Census Tract 4031.01 6,944 16.7 417
Census Tract 4037.01 6,759 71.0 95
Census Tract 4031.22 6,486 3.7 1,753
Census Tract 4037.02 6,271 90.9 69
Census Tract 4036.04 6,247 2.9 2,182
Census Tract 4018 5,977 4.4 1,346
Census Tract 4035.02 5,870 8.7 673
Census Tract 4008.02 5,869 1.4 4,209
Census Tract 4035.32 5,611 24.5 229
Census Tract 4028.05 5,592 21.2 264
Census Tract 4017.21 5,532 3.0 1,873
Census Tract 4029 5,283 3.8 1,403
Census Tract 4030.01 5,216 2.4 2,199
Census Tract 4009.03 5,201 18.3 285
Census Tract 4038.01 5,198 69.6 75
Census Tract 4001.02 5,137 0.8 6,246
Census Tract 4009.51 5,001 2.0 2,511
Census Tract 4019.05 4,748 16.3 291
Census Tract 4013 4,715 2.0 2,325
Census Tract 4032 4,466 1.3 3,416
Census Tract 4038.02 4,431 116.3 38
Census Tract 4020 4,086 2.5 1,635
Census Tract 4035.34 3,965 11.9 334
Census Tract 4034.01 3,846 1.3 2,893
Census Tract 4002 3,815 4.8 789
Census Tract 4036.01 3,646 9.4 386
Census Tract 4028.01 3,587 21.4 168
Census Tract 4011.02 3,520 0.8 4,631
Census Tract 4028.03 3,371 26.9 125
Census Tract 4022 3,228 1.4 2,268
Census Tract 4009.04 3,162 1.6 1,936
Census Tract 4009.52 3,127 2.2 1,407
Census Tract 4034.04 3,093 0.9 3,322
Census Tract 4021 3,061 1.7 1,821
Census Tract 4014 3,032 1.2 2,595
Census Tract 4041 2,833 19.5 145
Census Tract 4027.22 2,828 5.5 517
Census Tract 4034.03 2,807 2.3 1,240
Census Tract 4033 2,800 0.8 3,452
Census Tract 4017.22 2,796 0.9 3,227
Census Tract 4011.01 2,739 0.7 3,726
Census Tract 4017.01 2,556 4.4 586
Census Tract 4026 2,555 0.7 3,500
Census Tract 4028.04 2,540 30.9 82
Census Tract 4001.01 2,510 0.9 2,816
Census Tract 4015 2,440 1.4 1,726
Census Tract 4006 2,378 0.9 2,551
Census Tract 4010 2,314 4.1 570
Census Tract 4040 2,289 1.7 1,343
Census Tract 4036.03 1,866 2.9 638
Census Tract 4012 1,853 2.4 783
Census Tract 4019.01 1,830 4.2 434
Census Tract 4025 1,822 0.5 3,622
Census Tract 4008.01 1,784 0.5 3,465
Census Tract 4023 1,664 0.8 2,212
Census Tract 4024 1,538 2.4 634
Census Tract 4007 1,498 1.8 810

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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 →