Clinton County is a county in Ohio, United States, about 50 miles northeast of Cincinnati and
35 miles southeast of Dayton, in the west-central part of the state. It had a population of
42,018 at the 2020 census, an estimated 42,301 by 2025, and covers 412.6 square miles (1,069 km2)
centred near 39°25′N 83°49′W.
Wilmington is the county seat and the county’s only city; its postal code is 45177. The
county holds 1 city, 8 incorporated villages and 19 unincorporated communities across 13
townships, and it runs on Eastern Time. Its FIPS code is 39027.
Towns & Villages in Clinton County
Clinton County has 28 named places on record: Wilmington and 8 incorporated villages, plus 19
unincorporated communities and one ghost town with no local government of their own. Unincorp.
covers crossroads and rural communities with no formal boundary.
| Place | Type | Township | Pop. | ZIP |
|---|---|---|---|---|
| Wilmington | City · seat | Washington | 12,664 | 45177 |
| Sabina | Village | Richland | 2,499 | 45169 |
| Blanchester | Village | Marion | 4,224 | 45107 |
| Lynchburg | Village | — | 1,510 | 45142 |
| New Vienna | Village | — | 1,108 | 45159 |
| Clarksville | Village | Vernon | 534 | 45113 |
| Martinsville | Village | Clark | 416 | 45146 |
| Midland | Village | Jefferson | 307 | 45148 |
| Port William | Village | Liberty | 229 | 45164 |
| Reesville | Unincorp. | Richland | — | — |
| Melvin | Unincorp. | Richland | — | — |
| New Antioch | Unincorp. | Green | — | — |
| Ogden | Unincorp. | Adams | — | — |
| Sligo | Unincorp. | Adams | — | — |
| Lees Creek | Unincorp. | Wayne | — | — |
| Bloomington | Unincorp. | Wilson | — | — |
| Cuba | Unincorp. | Washington | — | — |
| Morrisville | Unincorp. | Washington | — | — |
| Westboro | Unincorp. | Jefferson | — | — |
| Burtonville | Unincorp. | — | — | — |
| Farmers | Unincorp. | — | — | — |
| Gurneyville | Unincorp. | — | — | — |
| Jonesboro | Unincorp. | — | — | — |
| North Kingman | Unincorp. | — | — | — |
| Lumberton | Unincorp. | — | — | — |
| McKays Station | Unincorp. | — | — | — |
| Memphis | Unincorp. | — | — | — |
| Oakland | Unincorp. | — | — | — |
| New Burlington | Ghost town | Chester | — | — |
Lynchburg and New Vienna are not confirmed in a single Clinton County township by Wikipedia
sourcing, so their township cell is left blank rather than guessed; Lynchburg itself straddles
the Clinton–Highland county line, with most of its built-up area on the Highland side.
Several names carried on older lists of this page — scattered mobile-home parks and rural
subdivisions with no independent population or ZIP record — are omitted here for lack of a
verifiable source.
Townships
| Township | Pop. (2020) | Main settlements |
|---|---|---|
| Marion | 5,520 | Blanchester |
| Richland | 3,526 | Sabina, Reesville, Melvin |
| Union | 3,140 | Rural, no incorporated place |
| Vernon | 2,951 | Clarksville |
| Green | 2,468 | New Antioch |
| Adams | 2,040 | Ogden, Sligo |
| Chester | 2,027 | New Burlington (ghost town) |
| Washington | 2,015 | Wilmington, Cuba, Morrisville |
| Clark | 2,014 | Martinsville |
| Jefferson | 1,325 | Midland, Westboro |
| Liberty | 1,123 | Port William |
| Wayne | 700 | Lees Creek |
| Wilson | 505 | Bloomington |
ZIP Codes
- 45177 — Wilmington (also serves the county government offices)
- 45107 — Blanchester (shared with Warren County)
- 45169 — Sabina
- 45159 — New Vienna
- 45142 — Lynchburg (shared with Highland County)
- 45113 — Clarksville
- 45146 — Martinsville
- 45148 — Midland
- 45164 — Port William
The unincorporated communities and New Burlington have no ZIP code of their own; mail there is
delivered under the nearest incorporated village or Wilmington’s code.
Geography
Clinton County sits in Ohio’s Till Plains, a belt of flat-to-gently-rolling farmland
shaped by glacial deposits. Of its 412.6 square miles, 409 are land and 3.6 are water, about 0.9
percent — the county has no large natural lake, and its main watercourses are the East
Fork Little Miami River, Cowan Creek and Todd Fork, a tributary of the Little Miami River.
Greene County lies to the north, Fayette County to the northeast, Highland County to the
southeast, Brown County to the south, Clermont County to the southwest, and Warren County to the
west. Greene County, Fayette County, Highland County, Brown County, Clermont County and Warren County all border
Clinton directly.
Demographics
Clinton County had a population of 42,018 at the 2020 census, and the latest estimate puts the
county near 42,301 residents. Wilmington and Blanchester are the two largest communities, together
holding roughly two-fifths of the county’s population. Median household income runs
$67,769 statewide for Ohio, 2023 ACS; county-level income figures on record date to the 2010
census ($46,261 median household, $22,163 per capita) and are not repeated here as current.
Population density works out to roughly 103 people per square mile of land, low for southwest
Ohio and consistent with the county’s largely agricultural land use.
Economy & Local Life
Wilmington anchors the county’s economy. ABX Air operates a cargo hub at the Airborne
Airpark, a legacy of the site’s decades as a DHL Americas air-freight base. CMH Regional
Health System, built around Clinton Memorial Hospital, employs close to 1,000 people across the
county. The AZEK Company runs a composite-decking plant and a polyethylene recycling facility in
Wilmington. Wilmington College, a liberal-arts school founded by Quakers in 1870, is the
county’s largest private employer outside health care and logistics. The county’s
biggest annual event is the Wilmington Banana Split Festival each June, marking the dessert’s
disputed 1907 invention in the city; the Clinton County Corn Festival follows each September.
History
Ohio’s General Assembly formed Clinton County on 19 February 1810, effective 1 March
1810, carving it from parts of Highland and Warren counties. It was named for George Clinton, a
soldier, four-term governor of New York and vice president of the United States under Jefferson
and Madison. Wilmington was laid out as the county seat the same year.
Clinton County has voted overwhelmingly Republican in nearly every presidential election since
1856; the only Democrat to carry it in that span was Lyndon Johnson in 1964, by a margin of just
432 votes. The county is included in the Cincinnati–Wilmington–Maysville combined
statistical area, as part of the Wilmington micropolitan statistical area centred on its own
county seat.
Getting There
Interstate 71 crosses the county’s northwest corner, reachable from Wilmington via State
Route 73. US Routes 22 and 68 run through the county along with State Routes 3, 28, 72, 73, 123,
124, 132, 133, 134, 251, 350, 380 and 729.
- Cincinnati — about 50 miles southwest
- Dayton — about 35 miles northwest
- Columbus — about 60 miles northeast
- Chillicothe — about 40 miles southeast
Wilmington has no direct Amtrak service. Dayton International Airport, about 40 miles
northwest, and Cincinnati/Northern Kentucky International Airport, about 55 miles southwest, are
the nearest major commercial airports; the Airborne Airpark in Wilmington itself handles cargo
and general aviation.
Frequently Asked Questions
Where is Clinton County located?
It sits in southwest Ohio’s Till Plains, about 50 miles northeast of Cincinnati, bordered
by Greene, Fayette, Highland, Brown, Clermont and Warren counties.
What is the population of Clinton County?
42,018 at the 2020 census, with a 2025 estimate near 42,301.
How big is Clinton County?
412.6 square miles (1,069 km2) in total, of which 409 square miles are land.
What is the county seat of Clinton County?
Wilmington is the county seat and the county’s only city.
How many towns and villages are in Clinton County?
Eight incorporated villages — Blanchester, Clarksville, Lynchburg, Martinsville, Midland,
New Vienna, Port William and Sabina — plus Wilmington and 19 unincorporated communities.
What ZIP codes does Clinton County use?
45177 for Wilmington, 45107 for Blanchester, 45169 for Sabina, 45159 for New Vienna, 45142 for
Lynchburg, 45113 for Clarksville, 45146 for Martinsville, 45148 for Midland and 45164 for Port
William.
What is Clinton County known for?
The Wilmington Banana Split Festival, marking the dessert’s disputed 1907 invention in the
city, and its longtime role as a DHL/ABX Air cargo hub at the Airborne Airpark.
More counties in this state: Towns and villages in Ohio.