Fairfield County, Ohio

County seat: Lancaster · Population 169,752 (2025) · 504 sq mi

Fairfield County is the 19th most populous of Ohio's 88 counties, with 169,752 people (2025 estimate). Its county seat is Lancaster. The map shows its 19 cities and towns and the 5 neighboring counties.

Map of Fairfield County, Ohio with cities, towns and the county boundary
Fairfield County, Ohio with its cities and towns, unincorporated communities (CDPs) and neighboring counties. Boundaries: U.S. Census Bureau, 2025. Free to use with attribution (CC BY 4.0).
Download PDF (Letter) 119 KBPNG image 91 KBOhio county map

Fairfield County facts

County seat
Lancaster
Population (2025 estimate)
169,752 +6.8% since 2020
Land area
504 sq mi 23rd largest of 88
Water area
4 sq mi
Population density
337 per sq mi
Established
1800
Largest city
Lancaster 41,956
Median household income
$90,966
Cities and towns
19 plus 3 CDPs
ZIP codes
19
Time zone
Eastern
FIPS code
39045

Cities and towns in Fairfield County

Fairfield County has 19 incorporated cities, towns and villages. Populations count the people living inside Fairfield County; cities that cross a county line also list the other counties.

NameTypePopulation 2025Also in
Lancaster (county seat)City41,956
PickeringtonCity26,256Franklin County
ColumbusCity11,742Delaware and Franklin counties
BaltimoreVillage3,110
LithopolisVillage2,920Franklin County
Canal WinchesterCity1,808Franklin County
BremenVillage1,528
ReynoldsburgCity1,226Franklin and Licking counties
MillersportVillage1,008
PleasantvilleVillage964
AmandaVillage680
ThurstonVillage616
StoutsvilleVillage582
CarrollVillage504
Sugar GroveVillage413
RushvilleVillage307
West RushvilleVillage165
Buckeye LakeVillage23Licking County
TarltonVillage0Pickaway County

Unincorporated communities (CDPs)

Census-designated places are communities without their own city government; the county provides their services.

CommunityPopulationAlso in
Fairfield Beach1,432
Hamburg461
Hide-A-Way Hills239Hocking County

ZIP codes in Fairfield County

19 ZIP codes reach into Fairfield County. ZIP codes ignore county lines, so some also cover a neighboring county.

Population of Fairfield County, 2020–2025

Fairfield County grew by 10,835 people (+6.8%) between April 2020 and July 2025: 2 more deaths than births and a net gain of 10,859 people from migration.

Year (July 1)Population
2020159,451
2021161,146
2022163,003
2023165,490
2024167,706
2025169,752

Neighboring counties

Printable Fairfield County map

The PDF is a vector file with real text: it prints sharp on Letter paper and you can search it for a town. The PNG is 2400 pixels wide for slides and documents. Both are free to use with a credit to WhichCounty.

Paste this code to embed the map on your site:

Sources

Back to the Ohio county map with all 88 counties. Found an error? Tell us.