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Fairfax County, VA Demographics

Fairfax County, VA is the most populous of 133 counties in Virginia, with 1,150,238 residents across 391 square miles. That is about 2,942 people per square mile.

At the 2020 census

Population 1,150,238
Land area 391 sq mi
Density 2,942 / sq mi

Data: 2020 Census · American Community Survey 2024

How Fairfax 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: Fairfax County, VA

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

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

Census tracts in Fairfax County, VA

Name Population Sq mi Per sq mi
Census Tract 4214 8,188 0.7 11,016
Census Tract 4709 7,993 1.7 4,716
Census Tract 4915.01 7,696 1.0 7,862
Census Tract 4401 7,503 2.4 3,169
Census Tract 4611 7,442 2.5 2,971
Census Tract 4826.01 7,321 1.5 4,836
Census Tract 4524 7,283 1.4 5,206
Census Tract 4304 7,217 2.2 3,274
Census Tract 4306 7,152 1.0 7,039
Census Tract 4215 7,103 0.7 10,054
Census Tract 4711 7,030 1.5 4,686
Census Tract 4915.02 7,014 2.2 3,138
Census Tract 4918.03 7,003 1.1 6,353
Census Tract 4522 6,982 0.9 7,795
Census Tract 4809.01 6,969 1.1 6,607
Census Tract 4615 6,940 1.2 5,645
Census Tract 4617 6,937 0.9 7,852
Census Tract 4221.01 6,872 0.9 7,300
Census Tract 4922.02 6,831 2.2 3,079
Census Tract 4405.03 6,817 0.8 8,421
Census Tract 4913.01 6,797 5.9 1,160
Census Tract 4221.02 6,677 2.6 2,594
Census Tract 4814 6,647 2.1 3,093
Census Tract 4921 6,592 11.5 574
Census Tract 4905.02 6,585 3.8 1,747
Census Tract 4912.01 6,558 0.8 8,172
Census Tract 4920 6,550 9.1 719
Census Tract 4911.03 6,548 0.7 9,015
Census Tract 4612.02 6,502 1.3 5,135
Census Tract 4316.02 6,485 1.5 4,281
Census Tract 4222.02 6,444 3.3 1,960
Census Tract 4216 6,409 0.4 14,313
Census Tract 4408 6,397 2.5 2,605
Census Tract 4526 6,347 1.2 5,442
Census Tract 4155 6,306 1.5 4,233
Census Tract 4812.02 6,301 1.5 4,330
Census Tract 4810 6,231 0.5 11,356
Census Tract 4817.01 6,196 4.0 1,536
Census Tract 4203 6,184 1.8 3,494
Census Tract 4516.01 6,129 0.4 16,717
Census Tract 4402.02 6,032 1.3 4,804
Census Tract 4804.02 6,028 8.1 741
Census Tract 4519 6,015 1.1 5,576
Census Tract 4218 5,933 0.8 7,565
Census Tract 4211.03 5,913 1.9 3,116
Census Tract 4211.01 5,912 1.1 5,312
Census Tract 4515.01 5,868 0.5 11,940
Census Tract 4819 5,821 4.1 1,433
Census Tract 4223.02 5,788 0.9 6,211
Census Tract 4805.02 5,763 1.2 4,966
Census Tract 4523.02 5,762 0.2 24,688
Census Tract 4325 5,758 1.2 4,625
Census Tract 4707 5,753 1.4 4,210
Census Tract 4315 5,733 1.5 3,882
Census Tract 4705 5,717 1.6 3,531
Census Tract 4528.01 5,627 0.4 12,695
Census Tract 4503 5,620 0.7 8,337
Census Tract 4160 5,569 1.3 4,218
Census Tract 4501 5,524 0.8 7,020
Census Tract 4618.02 5,448 0.6 8,745
Census Tract 4916.01 5,421 0.7 7,608
Census Tract 4527 5,398 0.5 10,797
Census Tract 4407.02 5,397 1.3 4,016
Census Tract 4808.01 5,388 0.9 6,000
Census Tract 4823.01 5,387 1.1 4,984
Census Tract 4811.06 5,362 1.4 3,783
Census Tract 4154.01 5,352 0.6 8,653
Census Tract 4210.02 5,348 1.7 3,118
Census Tract 4811.05 5,332 1.3 4,097
Census Tract 4916.02 5,310 0.9 6,210
Census Tract 4825.06 5,298 0.6 8,347
Census Tract 4825.04 5,277 1.6 3,307
Census Tract 4224.02 5,236 0.7 7,171
Census Tract 4162 5,201 7.3 715
Census Tract 4604 5,134 1.6 3,291
Census Tract 4323 5,127 1.1 4,461
Census Tract 4324.02 5,100 1.1 4,567
Census Tract 4521.01 5,091 1.3 3,934
Census Tract 4901.01 5,064 1.9 2,694
Census Tract 4917.04 5,062 0.5 9,920
Census Tract 4616.03 5,056 0.5 10,531
Census Tract 4158 5,047 1.4 3,609
Census Tract 4917.03 5,035 0.6 8,551
Census Tract 4525.02 5,011 0.5 10,744
Census Tract 4405.01 5,006 1.7 2,910
Census Tract 4704 4,994 2.2 2,259
Census Tract 4326 4,967 1.2 4,229
Census Tract 4302.02 4,949 1.1 4,449
Census Tract 4310.01 4,948 0.9 5,602
Census Tract 4914.01 4,934 0.5 9,682
Census Tract 4515.02 4,924 0.7 7,063
Census Tract 4206 4,911 0.5 9,217
Census Tract 4820.01 4,874 1.6 3,064
Census Tract 4924 4,873 1.4 3,473
Census Tract 4825.03 4,832 1.1 4,245
Census Tract 4506.02 4,814 0.5 9,345
Census Tract 4817.02 4,787 1.1 4,518
Census Tract 4322.02 4,741 0.9 5,004
Census Tract 4301.01 4,718 1.3 3,695
Census Tract 4804.01 4,717 3.4 1,389

Showing the 100 most populous of 274 — 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 →