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St. Clair County, MI Demographics

St. Clair County, MI is the 13th most populous of 83 counties in Michigan, with 160,383 residents across 722 square miles. That is about 222 people per square mile.

At the 2020 census

Population 160,383
Land area 722 sq mi
Density 222 / sq mi

Data: 2020 Census · American Community Survey 2024

How St. Clair 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: St. Clair County, MI

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

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

Census tracts in St. Clair County, MI

Name Population Sq mi Per sq mi
Census Tract 6350 6,216 5.6 1,107
Census Tract 6304 5,900 5.1 1,152
Census Tract 6346 5,805 13.8 420
Census Tract 6420 5,464 2.9 1,865
Census Tract 6572 5,362 70.9 76
Census Tract 6551 4,917 70.8 69
Census Tract 6200 4,719 1.6 2,877
Census Tract 6360 4,576 7.2 634
Census Tract 6460 4,510 14.1 320
Census Tract 6440 4,228 2.2 1,881
Census Tract 6490 4,196 1.4 2,957
Census Tract 6516 4,112 36.8 112
Census Tract 6320 4,077 15.5 262
Census Tract 6220 4,047 0.7 5,784
Census Tract 6501 3,952 16.5 240
Census Tract 6371 3,940 2.7 1,464
Census Tract 6372 3,821 1.6 2,452
Census Tract 6341 3,804 23.3 163
Census Tract 6430 3,704 6.6 562
Census Tract 6585 3,514 38.7 91
Census Tract 6410 3,509 34.2 103
Census Tract 6210 3,488 0.7 5,090
Census Tract 6280 3,481 0.9 3,955
Census Tract 6556 3,319 65.5 51
Census Tract 6450 3,257 20.8 157
Census Tract 6526 3,180 37.4 85
Census Tract 6230 2,986 0.7 4,309
Census Tract 6470 2,977 2.2 1,363
Census Tract 6331 2,828 10.1 280
Census Tract 6332 2,695 25.5 106
Census Tract 6290 2,678 1.1 2,329
Census Tract 6270 2,542 0.7 3,430
Census Tract 6581 2,515 35.3 71
Census Tract 6402 2,442 18.7 131
Census Tract 6521 2,405 35.7 67
Census Tract 6406 2,347 17.3 135
Census Tract 6401 2,296 2.4 964
Census Tract 6373 2,236 3.1 727
Census Tract 6512 2,122 13.7 155
Census Tract 6316 2,052 1.4 1,436
Census Tract 6571 1,987 1.9 1,069
Census Tract 6260.01 1,938 0.6 3,290
Census Tract 6311 1,931 5.5 352
Census Tract 6511 1,871 23.3 80
Census Tract 6240 1,598 0.4 3,974
Census Tract 6250.01 1,486 0.5 2,935
Census Tract 6301 1,359 3.9 347
Census Tract 6480 959 19.2 50
Census Tract 6502 909 0.6 1,625
Census Tract 9890 20 0.1 173

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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 →