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Fairfield County, OH Demographics

Fairfield County, OH is the 20th most populous of 88 counties in Ohio, with 158,921 residents across 504 square miles. That is about 315 people per square mile.

At the 2020 census

Population 158,921
Land area 504 sq mi
Density 315 / sq mi

Data: 2020 Census · American Community Survey 2024

How Fairfield 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: Fairfield County, OH

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

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

Census tracts in Fairfield County, OH

Name Population Sq mi Per sq mi
Census Tract 306.01 7,918 4.9 1,612
Census Tract 316 6,763 4.7 1,431
Census Tract 311 6,303 61.9 102
Census Tract 329.01 6,223 7.7 804
Census Tract 329.02 5,957 2.3 2,551
Census Tract 308 5,950 27.1 220
Census Tract 310 5,646 33.3 170
Census Tract 331.02 5,424 1.7 3,135
Census Tract 330 5,365 15.4 347
Census Tract 309.01 5,146 11.5 446
Census Tract 312 4,905 42.7 115
Census Tract 304 4,796 43.2 111
Census Tract 327.01 4,515 1.3 3,359
Census Tract 331.01 4,488 4.5 992
Census Tract 327.04 4,444 1.7 2,658
Census Tract 314.02 4,296 1.6 2,771
Census Tract 328 4,235 1.3 3,195
Census Tract 307 4,209 10.1 417
Census Tract 306.02 4,044 1.8 2,261
Census Tract 327.03 4,021 0.5 8,370
Census Tract 323 3,998 2.6 1,509
Census Tract 309.02 3,996 20.1 199
Census Tract 317 3,920 0.7 5,649
Census Tract 301 3,669 11.9 309
Census Tract 322 3,580 1.2 2,871
Census Tract 326.02 3,562 45.9 78
Census Tract 325.01 3,554 47.8 74
Census Tract 303 3,418 7.1 482
Census Tract 321 3,371 0.5 7,124
Census Tract 320 3,290 0.8 4,027
Census Tract 326.01 3,244 27.3 119
Census Tract 313 3,187 4.2 767
Census Tract 302 3,004 36.2 83
Census Tract 315 2,984 1.2 2,591
Census Tract 325.02 2,902 13.2 219
Census Tract 314.01 2,594 4.3 598

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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 →