New Vienna

Clinton County, Ohio (rural south-central Ohio county between Dayton and Cincinnati, ~42,500 residents, county seat Wilmington, 13 townships, six incorporated places including Wilmington (city), Blanchester (village, shared with Warren and Brown counties), Clarksville (village), Martinsville (village), Midland (village), New Vienna (village), Port William (village), and Sabina (village)) is one of the relatively small number of Ohio counties that has adopted county-tier rural zoning under O.R.C. Chapter 303. The current operative document is the Clinton County Zoning Resolution, originally adopted in the late 20th century with the most recent comprehensive update effective 2025. Unlike Adams County, Athens County, and most rural Ohio counties, Clinton County exercises affirmative county-tier zoning authority over 11 of its 13 townships. The two outliers are Clark Township and Washington Township, which have not opted into the county zoning resolution and are therefore unzoned for land-use purposes (the Ohio Residential Code and Clinton County Health Department septic rules still apply there). For ADU purposes the county zoning resolution does not use the term 'accessory dwelling unit' or 'ADU' but does regulate dwellings as a permitted use in residential and agricultural districts; second dwellings on a single parcel are generally not a permitted accessory use and typically require a Conditional Use approval or a lot split. Permitting in unincorporated zoned townships requires a Clinton County Zoning Permit issued by the County Building and Zoning Department before a building permit can be issued.

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