Buying Land in Clinton County, Ohio

Zoning: a real countywide resolution, with two named exceptions

Clinton County is one of the Ohio counties that has actually gone ahead and adopted countywide rural zoning under ORC Chapter 303, rather than leaving the question entirely to individual townships. The county's Rural Zoning Commission -- five residents of the zoned unincorporated area, appointed by the Board of County Commissioners -- administers the resulting Clinton County Zoning Resolution, with final authority resting with the commissioners and appeals running through a separate county Board of Zoning Appeals.

Per the county's own posted materials, every township in Clinton County falls under this county zoning and requires a zoning permit for covered activity, with two named exceptions: Clark Township and Washington Township are unzoned communities and require no zoning permit at all. This research pass could not confirm whether Clark or Washington have instead adopted their own separate Chapter 519 township zoning of their own, or are simply unzoned outright with no zoning authority covering them -- if you're evaluating land in either township specifically, confirm directly with the township trustees rather than assuming "unzoned under the county" means "no zoning authority whatsoever."

Agriculture: some of Ohio's strongest row-crop ground

Clinton County sits on genuinely high-performing farmland by state standards: recent Ohio State University Extension reporting on county-level yield data put Clinton County's average corn yield at 222.1 bushels per acre -- the highest average of any Ohio county in that dataset -- alongside a second-highest-in-the-state average soybean yield of 63.2 bushels per acre. For a buyer evaluating tillable acreage here, that's a meaningful data point when comparing Clinton County ground against farmland elsewhere in the state, though actual yield on any specific parcel still depends on soil type, drainage, and management rather than the countywide average alone.

Wilmington Air Park: a former Air Force base, a real boom-bust cycle, and a rebound

Immediately north of Wilmington sits the roughly 1,900-acre Wilmington Air Park, built on the site of the former Clinton County Air Force Base after its 1972 decommissioning. The county's Community Improvement Corporation developed it into the Wilmington Industrial Air Park, and by the 1980s Airborne Express (later Airborne Freight, then bought by DHL in 2003) had become its dominant tenant, with DHL investing roughly $300 million in improvements over seven years of ownership.

That run ended abruptly: DHL's January 2009 decision to exit domestic U.S. package delivery cost the region an estimated 8,000-plus jobs almost overnight, one of the more severe single-employer economic shocks in recent Ohio history. Rather than simply closing the site, DHL donated the entire Air Park to the Clinton County Port Authority in 2010 -- described in contemporaneous reporting as one of the largest private-land donations in Ohio's history -- for redevelopment. That redevelopment has substantially succeeded: the Air Park today reports nearly all its leasable space occupied, roughly a dozen tenant companies, and about 4,000 employees, with Amazon Air among the more prominent current tenants and the facility ranked among Ohio's highest-volume cargo airports by federal transportation statistics.

None of this changes the zoning or septic framework described above for a typical rural land purchase elsewhere in the county, but it's useful context for understanding Clinton County's economy and why land near Wilmington and the Air Park has a different commercial-logistics character than the county's farmland further out.

Septic, well, and other departments to know

The Clinton County Health District (111 S. Nelson Avenue, Wilmington; (937) 382-7251) handles both halves of a typical rural build: household sewage treatment system permitting and inspection under ORC Chapter 3718 and OAC 3701-29, and private water system (well) permitting, including the required post-installation water test and final inspection before a well permit is closed out. Both run through the same office, which simplifies coordination for new construction on a raw parcel.

For parcel records, contact the Clinton County Auditor for property valuation, GIS, and parcel-number lookups, and the Clinton County Recorder for deeds, easements, and recorded plats -- including any recorded township zoning resolution if you're confirming Clark or Washington Township's exact status directly.