• county
  • FIPS 39165
  • Largest town: Mason

Warren County, Ohio

Warren County had 256,059 residents in the Census Vintage 2024 estimate, on 401.4 square miles of land. It ranks 10th of 88 in Ohio by population and 79th by land area.

Population
256,059
#10 of 88 in Ohio · #287 in US
Area
401.4 sq mi
#79 of 88 in Ohio · #2,519 in US
Density
638 / sq mi
#11 of 88 in Ohio · #224 in US
Median household income
$107,973
#2 of 88 in Ohio · #76 in US

Census Vintage 2024 estimates · SAIPE 2023 income · 2024 Gazetteer land area

Warren County within Ohio. Pin: Columbus.

Measure from here

Tools and pages that start from Warren County

Warren County population, land area and income

Warren County had 256,059 residents in the Census Vintage 2024 estimate, on 401.4 square miles of land. It ranks 10th of 88 in Ohio by population and 79th by land area. That works out to 637.9 people per square mile, 6.6 times the US average of 96.3, and in the top tenth nationally.

The median county-equivalent in Ohio has 58,250 residents, so Warren County is 4.4 times that size.

Its SAIPE 2023 median household income of $107,973 is in the top tenth among 3,143 counties with an estimate.

National rank among 3,144

Population

256,059

3144th1st

287th of 3,144 (US)

Land area

401 sq mi

3144th1st

2519th of 3,144 (US)

Density

637.9 / sq mi

3144th1st

224th of 3,144 (US)

Median household income

$107,973

3143rd1st

76th of 3,143 (US)

Rank within Ohio (88)

Population

256,059

88th1st

10th of 88 (OH)

Land area

401 sq mi

88th1st

79th of 88 (OH)

Density

637.9 / sq mi

88th1st

11th of 88 (OH)

Median household income

$107,973

88th1st

2nd of 88 (OH)

How Warren County's population changed since 2020

Warren County gained 12,823 residents between the July 2020 and July 2024 estimates, a rise of 5.3%. That ranks 4th of 88 in Ohio for growth. The median Ohio county changed by -0.2%, and the state as a whole by +0.7%.

Since the April 2020 estimates base, Warren County recorded 10,363 births and 9,382 deaths, a natural change of +981. Net international migration added +5,436 and net domestic migration, people moving to or from other US counties, came to +7,431. The largest single component was domestic migration, which added 7,431 people.

243.2k2020246.9k2021250.3k2022253.6k2023256.1k2024
Census Vintage 2024 county estimates for July 1 of each year. The axis starts above zero so year-to-year changes are visible.

Components of change, April 2020 to July 2024

Births
10,363
Deaths
9,382
Net international migration
+5,436
Net domestic migration
+7,431
Change, July 2023 to July 2024
+2,480

Where Warren County is

The Census internal point of Warren County is at 39.425700, -84.169900. It sits in UTM zone 16N. The map shades Ohio's 88 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Warren County outlined. Dots are towns of 1,000+ people with residents in it.

Shelby County: -0.4%Defiance County: +1.0%Darke County: -0.8%Seneca County: -0.6%Wood County: +0.6%Fayette County: -0.7%Clark County: -0.7%Hocking County: -2.2%Jackson County: +0.2%Miami County: +2.7%Richland County: -0.1%Union County: +13.7%Auglaize County: -1.2%Hancock County: +0.1%Morgan County: -1.6%Van Wert County: -0.1%Hardin County: -1.0%Paulding County: -0.3%Portage County: +1.2%Delaware County: +10.6%Harrison County: -3.1%Ross County: -1.3%Crawford County: -0.9%Clinton County: -0.0%Henry County: -0.5%Pike County: -0.0%Cuyahoga County: -1.7%Highland County: +1.0%Knox County: +1.7%Ottawa County: -1.5%Huron County: -0.6%Erie County: -2.2%Holmes County: +1.0%Lawrence County: -4.0%Marion County: -0.6%Fairfield County: +5.2%Putnam County: -0.6%Guernsey County: -0.5%Vinton County: -2.1%Gallia County: -1.2%Trumbull County: -0.7%Wayne County: -0.2%Perry County: +0.6%Ashland County: -0.1%Fulton County: -1.4%Brown County: +1.4%Lucas County: -1.1%Stark County: -0.1%Medina County: +1.1%Belmont County: -2.4%Williams County: -1.4%Mahoning County: -1.0%Noble County: +1.1%Greene County: +2.5%Preble County: -0.5%Allen County: -1.2%Athens County: +1.3%Jefferson County: -2.0%Adams County: +0.8%Monroe County: -2.3%Washington County: -2.2%Logan County: -0.1%Franklin County: +2.4%Warren County: +5.3%Wyandot County: -2.1%Licking County: +3.4%Hamilton County: +0.8%Clermont County: +2.6%Butler County: +2.2%Coshocton County: +1.1%Geauga County: -0.0%Sandusky County: -0.0%Ashtabula County: -0.6%Carroll County: -0.9%Tuscarawas County: -1.2%Morrow County: +2.7%Montgomery County: +0.1%Mercer County: +0.3%Lake County: -0.1%Pickaway County: +6.0%Madison County: +3.8%Muskingum County: +0.1%Meigs County: -3.0%Columbiana County: -1.8%Lorain County: +2.7%Scioto County: -2.8%Champaign County: +0.4%Summit County: -0.3%
Change 2020 to 2024
  1. < -1.4%
  2. < -0.6%
  3. < -0.0%
  4. < +1.1%
  5. ≥ +1.1%
no data

Orange pin: Warren County internal point. Dark pin: Columbus.

Internal point

Decimal
39.425700, -84.169900
DMS
39°25'32.52"N 84°10'11.64"W
UTM
16N 743607.4E 4367841.3N
Geohash
dph0k9jr7
Plus code
86FQCRGJ+72

Towns in Warren County

12 incorporated places of 1,000+ people have residents in Warren County, 112,514 people together, or 44% of the county. Each figure counts only the part of the town inside Warren County; towns marked "part" extend into another county. The largest is Mason with 36,046.

  1. 01Mason36,046
  2. 02Lebanon21,995
  3. 03Springboro (part)18,442
  4. 04Franklin11,758
  5. 05South Lebanon6,923
  6. 06Carlisle (part)5,641
  7. 07Middletown (part)3,959
  8. 08Waynesville2,862
  9. 09Morrow2,199
  10. 10Maineville1,517
  11. 11Loveland (part)1,050
  12. 12Monroe (part)122
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Warren County

The Census 2024 county adjacency file lists 6 neighbors for Warren County. The most populous is Hamilton County, OH, with 837,359 residents. Distances run between Census internal points in a straight line.

Distance to Columbus and the nearest big city

Columbus is 72.4 miles ENE of Warren County's internal point in a straight line. The nearest place of 100,000 or more is Dayton, OH (population 136,346), 24.9 miles away. The nearest place of 10,000 or more is Lebanon, OH (population 21,995), 2.5 miles away.

Warren County FIPS code

The FIPS code of Warren County is 39165: state code 39 for Ohio plus county code 165. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $107,973.

Questions people ask

What is the population of Warren County, Ohio?

The Census Vintage 2024 estimate for July 1, 2024 is 256,059. That is up 12,823 people (5.3%) from the July 2020 estimate of 243,236.

What is the FIPS code of Warren County?

39165. The first two digits (39) are Ohio; the last three (165) identify the county.

What is the largest town in Warren County?

Mason, with 36,046 residents inside Warren County in 2024.

Which counties border Warren County?

6 county-equivalents border it in the Census 2024 adjacency file: Hamilton County, OH; Montgomery County, OH; Butler County, OH; Clermont County, OH; Greene County, OH; Clinton County, OH.

Sources and data as of

Data as of: Census Vintage 2024 population estimates, 2024 Gazetteer land area and internal points, SAIPE 2023 median household income.

  1. 01Census Vintage 2024 county population estimates
  2. 02Census 2024 Gazetteer, counties
  3. 03Census SAIPE 2023 state and county estimates
  4. 04Census Vintage 2024 subcounty population estimates
  5. 05Census 2024 county adjacency file
  6. 06Census 2024 cartographic boundary file, counties (1:5,000,000)

How every number is computed: methodology. Spotted a wrong figure? Report an error.