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McHenry County, IL Demographics

McHenry County, IL is the 6th most populous of 102 counties in Illinois, with 310,229 residents across 603 square miles. That is about 514 people per square mile.

At the 2020 census

Population 310,229
Land area 603 sq mi
Density 514 / sq mi

Data: 2020 Census · American Community Survey 2024

How McHenry 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: McHenry County, IL

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

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

Census tracts in McHenry County, IL

Name Population Sq mi Per sq mi
Census Tract 8715.02 8,411 61.4 137
Census Tract 8707.02 7,588 8.8 860
Census Tract 8708.09 6,801 8.0 850
Census Tract 8712.01 6,779 2.0 3,383
Census Tract 8712.06 6,648 3.0 2,243
Census Tract 8713.05 6,502 3.9 1,658
Census Tract 8713.12 6,393 2.4 2,703
Census Tract 8706.05 6,322 2.6 2,442
Census Tract 8715.01 6,302 20.9 301
Census Tract 8706.04 6,113 4.4 1,378
Census Tract 8714.02 6,099 8.7 700
Census Tract 8710.04 6,072 42.7 142
Census Tract 8702 5,959 104.9 57
Census Tract 8704.02 5,884 1.4 4,068
Census Tract 8712.02 5,827 1.0 5,678
Census Tract 8711.08 5,556 1.4 3,990
Census Tract 8709.06 5,510 20.8 265
Census Tract 8711.07 5,369 1.9 2,798
Census Tract 8711.11 5,352 2.9 1,874
Census Tract 8707.03 5,350 10.9 492
Census Tract 8711.12 5,344 4.0 1,343
Census Tract 8711.05 5,227 1.3 4,042
Census Tract 8708.07 5,178 2.9 1,765
Census Tract 8708.13 5,115 7.1 719
Census Tract 8711.14 4,999 1.7 3,004
Census Tract 8711.09 4,888 1.0 4,706
Census Tract 8701.04 4,848 22.5 215
Census Tract 8713.01 4,831 2.6 1,888
Census Tract 8709.04 4,812 2.1 2,293
Census Tract 8713.11 4,786 3.9 1,241
Census Tract 8712.07 4,772 1.2 3,876
Census Tract 8708.12 4,715 2.5 1,890
Census Tract 8709.05 4,683 1.4 3,408
Census Tract 8713.07 4,646 2.0 2,298
Census Tract 8705.02 4,637 2.1 2,200
Census Tract 8712.05 4,596 1.0 4,762
Census Tract 8703.02 4,550 5.0 902
Census Tract 8703.01 4,545 28.0 163
Census Tract 8716 4,530 3.5 1,288
Census Tract 8708.11 4,493 7.0 640
Census Tract 8708.10 4,406 7.5 585
Census Tract 8704.03 4,404 19.8 222
Census Tract 8714.04 4,389 1.3 3,401
Census Tract 8711.10 4,360 1.9 2,328
Census Tract 8706.03 4,357 2.5 1,714
Census Tract 8710.03 4,352 33.4 130
Census Tract 8705.01 4,351 10.2 428
Census Tract 8713.10 4,323 1.5 2,846
Census Tract 8711.13 3,988 3.7 1,071
Census Tract 8708.14 3,954 8.7 452
Census Tract 8706.06 3,945 1.5 2,631
Census Tract 8704.04 3,896 14.0 277
Census Tract 8712.08 3,820 0.7 5,451
Census Tract 8708.08 3,682 3.0 1,218
Census Tract 8707.04 3,605 1.7 2,146
Census Tract 8709.03 3,600 1.9 1,934
Census Tract 8701.05 3,504 10.7 326
Census Tract 8712.09 3,482 2.2 1,576
Census Tract 8713.04 3,417 2.7 1,251
Census Tract 8701.06 3,091 5.3 585
Census Tract 8711.15 2,994 1.3 2,265
Census Tract 8709.07 2,967 9.9 301
Census Tract 8701.03 2,517 38.2 66
Census Tract 8713.13 1,793 2.9 620

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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 →