- Sabina (Population: 2,780)
- Salem (Population: 12,197)
- Salineville (Population: 1,397)
- Sandusky (Population: 27,844)
- Sandusky South (Population: 6,599)
- Seaman (Population: 1,039)
- Sebring (Population: 4,912)
- Seven Hills (Population: 12,080)
- Seville (Population: 2,160)
- Shadyside (Population: 3,675)
- Shaker Heights (Population: 29,405)
- Sharonville (Population: 13,804)
- Shawnee Hills (Population: 419)
- Sheffield Lake (Population: 9,371)
- Sheffield (Population: 2,949)
- Shelby (Population: 9,821)
- Sherwood (Population: 801)
- Shiloh (Population: 721)
- Shreve (Population: 1,582)
- Sidney (Population: 20,211)
- Silver Lake (Population: 3,019)
- Silverton (Population: 5,178)
- Smithville (Population: 1,333)
- Somerset (Population: 1,549)
- South Amherst (Population: 1,863)
- South Bloomfield (Population: 1,179)
- South Canal (Population: 1,346)
- South Charleston (Population: 1,850)
- South Euclid (Population: 23,537)
- South Lebanon (Population: 2,538)
- South Point (Population: 3,742)
- South Russell (Population: 4,022)
- South Zanesville (Population: 1,936)
- Spencerville (Population: 2,235)
- Springboro (Population: 12,380)
- Springdale (Population: 10,563)
- Springfield (Population: 65,358)
- St. Bernard (Population: 4,924)
- St. Clairsville (Population: 5,057)
- St. Henry (Population: 2,271)
- St. Marys (Population: 8,342)
- St. Paris (Population: 1,998)
- Steubenville (Population: 19,015)
- Stow (Population: 32,139)
- Strasburg (Population: 2,310)
- Streetsboro (Population: 12,311)
- Strongsville (Population: 43,858)
- Struthers (Population: 11,756)
- Stryker (Population: 1,406)
- Sugarcreek (Population: 2,174)
- Summerside (Population: 5,523)
- Sunbury (Population: 2,630)
- Swanton (Population: 3,307)
- Sylvania (Population: 18,670)
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