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Marion County, IN Demographics

Marion County, IN is the most populous of 92 counties in Indiana, with 977,203 residents across 397 square miles. That is about 2,464 people per square mile.

At the 2020 census

Population 977,203
Land area 397 sq mi
Density 2,464 / sq mi

Data: 2020 Census · American Community Survey 2024

How Marion 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: Marion County, IN

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

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

Census tracts in Marion County, IN

Name Population Sq mi Per sq mi
Census Tract 3801.03 9,056 10.6 851
Census Tract 3904.09 8,018 2.1 3,877
Census Tract 3812.05 7,687 1.7 4,538
Census Tract 3811.02 7,356 1.9 3,829
Census Tract 3703.03 7,217 3.5 2,057
Census Tract 3801.01 7,112 2.4 2,940
Census Tract 3901.04 7,020 3.1 2,259
Census Tract 3103.06 6,924 2.0 3,453
Census Tract 3423 6,860 2.1 3,304
Census Tract 3903 6,844 14.4 476
Census Tract 3902 6,766 7.1 947
Census Tract 3604.05 6,760 2.0 3,324
Census Tract 3420 6,690 3.7 1,791
Census Tract 3401.15 6,601 1.1 5,964
Census Tract 3103.05 6,588 1.4 4,561
Census Tract 3219 6,431 0.9 6,983
Census Tract 3305 6,329 2.0 3,131
Census Tract 3302.10 6,309 2.0 3,101
Census Tract 3605.01 6,289 1.7 3,667
Census Tract 3101.12 6,264 6.8 916
Census Tract 3807 6,221 2.0 3,134
Census Tract 3604.01 6,205 1.0 6,095
Census Tract 3103.12 6,203 1.4 4,465
Census Tract 3302.04 6,133 3.1 1,975
Census Tract 3809.02 6,133 2.5 2,420
Census Tract 3302.11 6,010 2.0 2,970
Census Tract 3304.01 5,985 2.8 2,160
Census Tract 3102.03 5,939 1.5 3,942
Census Tract 3811.01 5,939 2.1 2,820
Census Tract 3910.02 5,931 0.8 7,904
Census Tract 3605.02 5,902 3.1 1,879
Census Tract 3209.01 5,883 2.0 2,921
Census Tract 3904.06 5,870 2.8 2,109
Census Tract 3103.11 5,831 1.9 3,142
Census Tract 3901.02 5,712 2.7 2,146
Census Tract 3904.08 5,703 2.0 2,840
Census Tract 3309 5,686 1.0 5,547
Census Tract 3301.07 5,683 3.3 1,704
Census Tract 3703.06 5,664 1.9 3,032
Census Tract 3904.07 5,632 2.8 2,025
Census Tract 3614.02 5,600 5.6 1,005
Census Tract 3606.02 5,585 1.7 3,281
Census Tract 3421.01 5,575 1.8 3,104
Census Tract 3609 5,570 1.0 5,442
Census Tract 3201.08 5,546 1.0 5,410
Census Tract 3809.01 5,538 2.0 2,721
Census Tract 3422 5,454 2.3 2,373
Census Tract 3614.01 5,451 4.0 1,369
Census Tract 3302.03 5,418 2.0 2,652
Census Tract 3806 5,383 2.1 2,563
Census Tract 3214 5,364 1.9 2,834
Census Tract 3301.05 5,344 2.7 1,973
Census Tract 3616.01 5,290 3.8 1,379
Census Tract 3102.04 5,281 2.2 2,452
Census Tract 3406 5,274 1.4 3,646
Census Tract 3306 5,267 1.0 5,110
Census Tract 3409.04 5,235 0.9 5,566
Census Tract 3576.01 5,132 0.8 6,352
Census Tract 3401.12 5,108 1.3 3,853
Census Tract 3212 5,071 1.2 4,394
Census Tract 3302.12 5,032 2.0 2,495
Census Tract 3307.02 5,026 0.9 5,633
Census Tract 3216 5,024 1.8 2,866
Census Tract 3425 5,004 1.3 3,858
Census Tract 3403.02 4,968 0.8 6,082
Census Tract 3405 4,932 1.5 3,315
Census Tract 3209.03 4,922 0.9 5,682
Census Tract 3301.09 4,907 2.0 2,404
Census Tract 3908.02 4,892 9.6 512
Census Tract 3606.01 4,889 1.5 3,232
Census Tract 3804.02 4,867 0.9 5,665
Census Tract 3604.06 4,865 0.9 5,576
Census Tract 3419.03 4,839 0.8 6,349
Census Tract 3402.02 4,830 0.8 5,710
Census Tract 3202.02 4,708 2.9 1,634
Census Tract 3302.06 4,695 1.5 3,107
Census Tract 3805.02 4,695 0.9 5,391
Census Tract 3401.02 4,666 0.9 4,929
Census Tract 3210.02 4,657 2.9 1,625
Census Tract 3209.02 4,644 0.8 5,692
Census Tract 3102.01 4,603 3.4 1,337
Census Tract 3904.05 4,561 2.1 2,223
Census Tract 3103.10 4,550 0.8 5,560
Census Tract 3542.01 4,538 0.4 12,474
Census Tract 3201.05 4,528 1.0 4,431
Census Tract 3401.14 4,440 1.5 2,942
Census Tract 3301.03 4,436 2.0 2,203
Census Tract 3401.13 4,422 1.2 3,552
Census Tract 3506 4,406 0.9 4,717
Census Tract 3904.11 4,395 1.0 4,535
Census Tract 3812.06 4,395 1.1 3,938
Census Tract 3301.06 4,354 1.2 3,623
Census Tract 3574 4,345 1.6 2,757
Census Tract 3308.06 4,269 0.6 7,007
Census Tract 3804.04 4,247 1.4 3,126
Census Tract 3407 4,219 1.9 2,208
Census Tract 3310 4,194 1.0 4,054
Census Tract 3217 4,183 1.1 3,735
Census Tract 3603.01 4,167 1.2 3,366
Census Tract 3602.01 4,162 1.8 2,314

Showing the 100 most populous of 253 — 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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