Delaware County, Ohio
County seat: Delaware · Population 242,032 (2025) · 443 sq mi
Delaware County is the 11th most populous of Ohio's 88 counties, with 242,032 people (2025 estimate). Its county seat is Delaware. The map shows its 10 cities and towns and the 6 neighboring counties.
Delaware County facts
- County seat
- Delaware
- Population (2025 estimate)
- 242,032 +13% since 2020
- Land area
- 443 sq mi 43rd largest of 88
- Water area
- 14 sq mi
- Population density
- 546 per sq mi
- Established
- 1808
- Named after
- Lenape indigenous people of North America
- Largest city
- Delaware 46,636
- Median household income
- $133,540
- Cities and towns
- 10 plus 2 CDPs
- ZIP codes
- 24
- Time zone
- Eastern
- FIPS code
- 39041
Cities and towns in Delaware County
Delaware County has 10 incorporated cities, towns and villages. Populations count the people living inside Delaware County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Delaware (county seat) | City | 46,636 | |
| Powell | City | 18,269 | |
| Columbus | City | 15,455 | Fairfield and Franklin counties |
| Westerville | City | 9,119 | Franklin County |
| Sunbury | City | 8,857 | |
| Dublin | City | 4,216 | Franklin and Union counties |
| Ashley | Village | 1,343 | |
| Ostrander | Village | 1,219 | |
| Galena | Village | 1,019 | |
| Shawnee Hills | Village | 931 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Radnor | 95 | |
| Kilbourne | 43 |
ZIP codes in Delaware County
24 ZIP codes reach into Delaware County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 43003 also Morrow County
- 43011 also Knox, Licking and Morrow counties
- 43013 also Licking County
- 43015 also Union County
- 43016 also Franklin and Union counties
- 43017 also Franklin and Union counties
- 43021
- 43031 also Licking County
- 43032
- 43035
- 43040 also Union County
- 43054 also Franklin and Licking counties
- 43061 also Union County
- 43065 also Franklin County
- 43066
- 43074 also Licking County
- 43081 also Franklin County
- 43082
- 43235 also Franklin County
- 43240
- 43334 also Morrow County
- 43342 also Marion and Union counties
- 43344 also Union and Marion counties
- 43356 also Marion and Morrow counties
Population of Delaware County, 2020–2025
Delaware County grew by 27,891 people (+13%) between April 2020 and July 2025: 2,909 more births than deaths and a net gain of 25,047 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 215,181 |
| 2021 | 221,342 |
| 2022 | 226,809 |
| 2023 | 232,079 |
| 2024 | 236,863 |
| 2025 | 242,032 |
Neighboring counties
- Union County west · 73,446 people
- Franklin County south · 1,361,536 people
- Morrow County northeast · 36,305 people
- Marion County north · 65,115 people
- Licking County southeast · 185,564 people
- Knox County east · 64,002 people
Printable Delaware 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.
- PDF (Letter) (93 KB)
- PNG (2400 px) (71 KB)
Paste this code to embed the map on your site:
Sources
- Boundaries: U.S. Census Bureau, 2025 Cartographic Boundary Files (1:500,000).
- Population: Census Bureau county and city estimates, Vintage 2025. CDP populations: American Community Survey 2020–2024.
- Places and ZIP codes: Census Bureau 2026 Gazetteer and 2020 ZIP Code Tabulation Area relationship files.
- County seat, founding year and name origin: Wikidata (CC0), checked against state sources.
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