Warren County, Ohio

County seat: Lebanon · Population 257,181 (2025) · 401 sq mi

Warren County is the 10th most populous of Ohio's 88 counties, with 257,181 people (2025 estimate). Its county seat is Lebanon. The map shows its 17 cities and towns and the 6 neighboring counties.

Map of Warren County, Ohio with cities, towns and the county boundary
Warren 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) 130 KBPNG image 100 KBOhio county map

Warren County facts

County seat
Lebanon
Population (2025 estimate)
257,181 +6.1% since 2020
Land area
401 sq mi 80th largest of 88
Water area
6 sq mi
Population density
641 per sq mi
Established
1803
Named after
Joseph Warren American doctor (1741-1775)
Largest city
Mason 35,834
Median household income
$110,132
Cities and towns
17 plus 6 CDPs
ZIP codes
24
Time zone
Eastern
FIPS code
39165

Cities and towns in Warren County

Warren County has 17 incorporated cities, towns and villages. Populations count the people living inside Warren County; cities that cross a county line also list the other counties.

NameTypePopulation 2025Also in
MasonCity35,834
Lebanon (county seat)City22,110
SpringboroCity18,388Montgomery County
FranklinCity11,647
South LebanonCity6,965
CarlisleCity5,664Montgomery County
MiddletownCity3,994Butler County
WaynesvilleVillage2,890
MorrowVillage2,223
MainevilleVillage1,518
LovelandCity1,035Clermont and Hamilton counties
HarveysburgVillage577
CorwinVillage534
ButlervilleVillage152
Pleasant PlainVillage140
MonroeCity123Butler County
BlanchesterVillage0Clinton County

Unincorporated communities (CDPs)

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

CommunityPopulationAlso in
Landen7,499
Hunter3,551
Five Points2,031
Loveland Park1,341Hamilton County
Kings Mills1,175
Roachester351

ZIP codes in Warren County

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

Population of Warren County, 2020–2025

Warren County grew by 14,836 people (+6.1%) between April 2020 and July 2025: 978 more births than deaths and a net gain of 13,939 people from migration.

Year (July 1)Population
2020243,211
2021246,722
2022249,822
2023252,993
2024255,039
2025257,181

Neighboring counties

Printable Warren County map

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Sources

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