• county
  • FIPS 39041
  • Largest town: Delaware

Delaware County, Ohio

Delaware County had 237,966 residents in the Census Vintage 2024 estimate, on 443.2 square miles of land. It ranks 11th of 88 in Ohio by population and 43rd by land area.

Population
237,966
#11 of 88 in Ohio · #303 in US
Area
443.2 sq mi
#43 of 88 in Ohio · #2,293 in US
Density
537 / sq mi
#13 of 88 in Ohio · #266 in US
Median household income
$128,300
#1 of 88 in Ohio · #22 in US

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

Delaware County within Ohio. Pin: Columbus.

Measure from here

Tools and pages that start from Delaware County

Delaware County population, land area and income

Delaware County had 237,966 residents in the Census Vintage 2024 estimate, on 443.2 square miles of land. It ranks 11th of 88 in Ohio by population and 43rd by land area. That works out to 537.0 people per square mile, 5.6 times the US average of 96.3, and in the top tenth nationally.

The median county-equivalent in Ohio has 58,250 residents, so Delaware County is 4.1 times that size.

Its SAIPE 2023 median household income of $128,300 is in the top tenth among 3,143 counties with an estimate.

National rank among 3,144

Population

237,966

3144th1st

303rd of 3,144 (US)

Land area

443 sq mi

3144th1st

2293rd of 3,144 (US)

Density

537.0 / sq mi

3144th1st

266th of 3,144 (US)

Median household income

$128,300

3143rd1st

22nd of 3,143 (US)

Rank within Ohio (88)

Population

237,966

88th1st

11th of 88 (OH)

Land area

443 sq mi

88th1st

43rd of 88 (OH)

Density

537.0 / sq mi

88th1st

13th of 88 (OH)

Median household income

$128,300

88th1st

1st of 88 (OH)

How Delaware County's population changed since 2020

Delaware County gained 22,804 residents between the July 2020 and July 2024 estimates, a rise of 10.6%. That ranks 2nd 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, Delaware County recorded 9,092 births and 6,370 deaths, a natural change of +2,722. Net international migration added +4,483 and net domestic migration, people moving to or from other US counties, came to +16,741. The largest single component was domestic migration, which added 16,741 people.

215.2k2020221.3k2021227.0k2022232.7k2023238.0k2024
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
9,092
Deaths
6,370
Net international migration
+4,483
Net domestic migration
+16,741
Change, July 2023 to July 2024
+5,234

Where Delaware County is

The Census internal point of Delaware County is at 40.278900, -83.007500. It sits in UTM zone 17N. The map shades Ohio's 88 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Delaware 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: Delaware County internal point. Dark pin: Columbus.

Internal point

Decimal
40.278900, -83.007500
DMS
40°16'44.04"N 83°00'27.00"W
UTM
17N 329333.8E 4460646.5N
Geohash
dphvphec9
Plus code
86GR7XHV+H2

Towns in Delaware County

9 incorporated places of 1,000+ people have residents in Delaware County, 104,016 people together, or 44% of the county. Each figure counts only the part of the town inside Delaware County; towns marked "part" extend into another county. The largest is Delaware with 46,521.

  1. 01Delaware46,521
  2. 02Columbus (part)15,853
  3. 03Powell14,613
  4. 04Sunbury9,705
  5. 05Westerville (part)9,362
  6. 06Dublin (part)4,364
  7. 07Ashley1,350
  8. 08Ostrander1,227
  9. 09Galena1,021
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Delaware County

The Census 2024 county adjacency file lists 6 neighbors for Delaware County. The most populous is Franklin County, OH, with 1,356,303 residents. Distances run between Census internal points in a straight line.

Distance to Columbus and the nearest big city

Columbus is 21.9 miles S of Delaware County's internal point in a straight line. The nearest place of 100,000 or more is Columbus, OH (population 933,263), 20.4 miles away. The nearest place of 10,000 or more is Delaware, OH (population 46,521), 3.6 miles away.

Delaware County FIPS code

The FIPS code of Delaware County is 39041: state code 39 for Ohio plus county code 041. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $128,300.

Questions people ask

What is the population of Delaware County, Ohio?

The Census Vintage 2024 estimate for July 1, 2024 is 237,966. That is up 22,804 people (10.6%) from the July 2020 estimate of 215,162.

What is the FIPS code of Delaware County?

39041. The first two digits (39) are Ohio; the last three (041) identify the county.

What is the largest town in Delaware County?

Delaware, with 46,521 residents inside Delaware County in 2024.

Which counties border Delaware County?

6 county-equivalents border it in the Census 2024 adjacency file: Franklin County, OH; Licking County, OH; Union County, OH; Marion County, OH; Knox County, OH; Morrow 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.