- Sabina - Zip Codes in Sabina
- Saint Clairsville - Zip Codes in Saint Clairsville
- Saint Marys - Zip Codes in Saint Marys
- Saint Paris - Zip Codes in Saint Paris
- Salem - Zip Codes in Salem
- Sandusky - Zip Codes in Sandusky
- Sardinia - Zip Codes in Sardinia
- Sebring - Zip Codes in Sebring
- Seville - Zip Codes in Seville
- Shade - Zip Codes in Shade
- Shadyside - Zip Codes in Shadyside
- Sheffield Lake - Zip Codes in Sheffield Lake
- Shelby - Zip Codes in Shelby
- Shreve - Zip Codes in Shreve
- Sidney - Zip Codes in Sidney
- Solon - Zip Codes in Solon
- Somerset - Zip Codes in Somerset
- South Charleston - Zip Codes in South Charleston
- South Point - Zip Codes in South Point
- Spencerville - Zip Codes in Spencerville
- Springboro - Zip Codes in Springboro
- Springfield - Zip Codes in Springfield
- Steubenville - Zip Codes in Steubenville
- Stow - Zip Codes in Stow
- Streetsboro - Zip Codes in Streetsboro
- Strongsville - Zip Codes in Strongsville
- Struthers - Zip Codes in Struthers
- Sugarcreek - Zip Codes in Sugarcreek
- Sunbury - Zip Codes in Sunbury
- Swanton - Zip Codes in Swanton
- Sylvania - Zip Codes in Sylvania