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Allegheny County, PA Demographics

Allegheny County, PA is the 2nd most populous of 67 counties in Pennsylvania, with 1,250,578 residents across 730 square miles. That is about 1,713 people per square mile.

At the 2020 census

Population 1,250,578
Land area 730 sq mi
Density 1,713 / sq mi

Data: 2020 Census · American Community Survey 2024

How Allegheny 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: Allegheny County, PA

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

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

Census tracts in Allegheny County, PA

Name Population Sq mi Per sq mi
Census Tract 4090.01 9,192 9.3 986
Census Tract 4560.03 8,059 12.2 660
Census Tract 4513 7,810 12.2 641
Census Tract 4911.01 7,681 6.4 1,195
Census Tract 5261.01 7,410 13.2 559
Census Tract 4592.01 7,344 9.1 805
Census Tract 4530.04 7,258 2.9 2,529
Census Tract 4370 7,178 6.9 1,048
Census Tract 5640 7,121 16.5 432
Census Tract 4141.02 7,044 7.0 1,005
Census Tract 4131 6,998 6.2 1,136
Census Tract 4773 6,819 1.4 4,972
Census Tract 4070.02 6,676 10.1 659
Census Tract 4135 6,621 3.4 1,967
Census Tract 4293 6,546 3.2 2,031
Census Tract 4591.02 6,426 3.7 1,744
Census Tract 4520 6,372 32.3 198
Census Tract 4120.03 6,312 3.2 1,976
Census Tract 4080.02 6,309 4.5 1,401
Census Tract 4110.02 6,076 4.5 1,340
Census Tract 4511.02 6,047 2.3 2,626
Census Tract 4263 5,982 2.0 2,972
Census Tract 4801.01 5,975 0.9 6,760
Census Tract 4142 5,936 5.5 1,083
Census Tract 5030.02 5,846 2.1 2,806
Census Tract 4733 5,771 1.3 4,531
Census Tract 4782 5,719 0.9 6,620
Census Tract 4080.01 5,633 10.1 556
Census Tract 5644 5,631 5.3 1,070
Census Tract 4511.05 5,625 3.6 1,567
Census Tract 4560.04 5,620 2.5 2,243
Census Tract 4845 5,614 1.0 5,788
Census Tract 1414 5,593 0.8 7,053
Census Tract 4070.01 5,586 18.8 297
Census Tract 4962 5,581 5.6 997
Census Tract 1401 5,579 0.6 9,846
Census Tract 4752 5,568 1.8 3,055
Census Tract 4090.02 5,499 7.6 720
Census Tract 4141.01 5,499 3.7 1,478
Census Tract 4753.04 5,466 1.7 3,255
Census Tract 4742.02 5,363 3.4 1,568
Census Tract 4220 5,343 7.9 679
Census Tract 4271 5,340 2.4 2,208
Census Tract 1918 5,252 0.6 9,335
Census Tract 5237.02 5,176 2.7 1,907
Census Tract 4268 5,150 2.0 2,577
Census Tract 5094 5,114 1.0 5,255
Census Tract 4900.02 5,102 3.2 1,602
Census Tract 5263.02 5,065 1.5 3,278
Census Tract 1413 5,048 0.3 14,680
Census Tract 5041 5,026 3.4 1,495
Census Tract 9822 5,022 0.2 25,722
Census Tract 4804 5,004 1.9 2,582
Census Tract 709 4,987 0.3 16,031
Census Tract 4761 4,979 0.9 5,327
Census Tract 4751.01 4,977 1.2 4,112
Census Tract 4211 4,969 3.4 1,465
Census Tract 4731 4,963 0.6 8,540
Census Tract 1517 4,956 0.5 10,818
Census Tract 4900.04 4,946 3.1 1,576
Census Tract 4292.01 4,941 1.8 2,729
Census Tract 4690 4,941 2.1 2,381
Census Tract 4600.01 4,925 2.6 1,915
Census Tract 4272 4,922 1.8 2,670
Census Tract 5234 4,921 1.3 3,917
Census Tract 4133 4,876 2.2 2,205
Census Tract 4120.02 4,865 3.2 1,537
Census Tract 5236 4,852 1.9 2,496
Census Tract 4742.03 4,802 1.7 2,822
Census Tract 201 4,729 0.6 8,578
Census Tract 4736.02 4,714 0.9 4,982
Census Tract 4890.01 4,703 1.4 3,266
Census Tract 5235.01 4,703 1.8 2,657
Census Tract 5238 4,687 1.9 2,531
Census Tract 4560.01 4,679 5.6 837
Census Tract 1408 4,658 0.4 11,077
Census Tract 4150.01 4,650 12.5 371
Census Tract 5262.02 4,649 4.4 1,061
Census Tract 4884 4,649 1.4 3,228
Census Tract 4292.02 4,605 1.7 2,742
Census Tract 4580.02 4,602 6.8 676
Census Tract 4011 4,601 5.1 904
Census Tract 4886 4,600 4.9 943
Census Tract 4302 4,551 0.7 6,692
Census Tract 5211 4,551 1.8 2,514
Census Tract 5212 4,521 2.8 1,598
Census Tract 4134 4,517 1.7 2,662
Census Tract 5213.02 4,516 3.1 1,467
Census Tract 4294 4,498 1.4 3,274
Census Tract 4772 4,466 1.1 3,989
Census Tract 4753.01 4,460 1.3 3,410
Census Tract 4741.01 4,460 1.6 2,846
Census Tract 4264 4,435 1.3 3,288
Census Tract 4295 4,412 1.6 2,775
Census Tract 4961.02 4,370 12.6 347
Census Tract 4781 4,363 0.6 7,462
Census Tract 4035 4,352 1.2 3,538
Census Tract 4580.01 4,333 6.8 637
Census Tract 4703 4,317 1.3 3,261
Census Tract 4705.01 4,317 0.4 9,905

Showing the 100 most populous of 394 — 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.

Read how BlockAtlas computes population within an area →