- Scout Island
- Scoville
- Scribner
- Sears
- Sedan
- Seneca
- Seward
- Shady Elm Mobile Home Park
- Shady Elm Trailer Court
- Shady Lane Trailer Court
- Shamrock Mobile Home Court
- Shedeeds Trailer Court
- Sheens Trailer Court
- Sheep Island
- Shelby
- Sheldonville
- Shelton
- Shestak
- Shickley
- Shippee
- Shoemaker Island
- Sholes
- Shubert
- Sidney
- Silver Creek
- Simeon
- Sioux View Park
- Skyline
- Smith Trailer Court
- Smithfield