Medway

Clark County, Ohio (~133,500 residents; county seat Springfield; 10 townships - Bethel, German, Green, Harmony, Mad River, Madison, Moorefield, Pike, Pleasant, and Springfield Township; incorporated places Springfield (city, county seat, ~59,680), New Carlisle (city, ~5,693), Catawba (village), Donnelsville (village), Enon (village - partly extends into Greene County), Medway (village), North Hampton (village), South Charleston (village), South Vienna (village), and Tremont City (village)) DOES exercise county-tier zoning under O.R.C. Chapter 303. Clark County is among the minority of Ohio counties that have adopted a county Rural Zoning Resolution (Resolution adopted under O.R.C. 303.02 et seq. by the Board of County Commissioners); the county Combined Planning & Zoning office administers it for unincorporated parcels in any township that has not adopted its own independent township zoning resolution under O.R.C. Chapter 519. Most Clark County townships (including Mad River, Bethel, Springfield Township, and German) operate under the county Rural Zoning Resolution rather than maintaining a separate township ordinance; a few have their own (Green Township, Moorefield Township, and Pleasant Township each carry stand-alone zoning resolutions). The county Rural Zoning Resolution treats accessory dwelling units as 'accessory residential structures' or 'second dwellings on a parcel,' with permission turning on the parcel's zoning district (A-1 Agricultural and R-1/R-2/R-3 Residential have differing accessory-use allowances), minimum lot area, setbacks, and a septic-capacity finding from the Clark County Combined Health District. Ohio is a home-rule state under Article XVIII of the Ohio Constitution, which insulates municipalities from county zoning inside their corporate limits; the county ordinance therefore does NOT govern parcels inside Springfield, New Carlisle, or any of the incorporated villages - each of those administers its own zoning code. The Mad River corridor through Mad River and Bethel townships is a meaningful overlay-adjacent factor because Mad River is a state-designated scenic river and a heavily-mapped FEMA Zone AE floodplain.

State-floor overlay: No Ohio statewide ADU preemption is in force as of 2026-05-20. Clark County and each of its incorporated municipalities and zoned townships retain full authority over ADU zoning and permitting under O.R.C. Chapters 303, 519, and 713 plus Ohio Constitution Article XVIII.

• flood-zone
• other
• historic-district
• other
• other