- South Switch Junction
- South Towne Park
- Southern Acres Mobile Estates
- Southview Estates Mobile Home Park
- Spaulding
- Spencer
- Spencer Island
- Spencers Grove
- Sperry
- Spillville
- Spirit Lake
- Spragueville
- Spring Fountain
- Spring Grove
- Spring Hill
- Spring Valley
- Springbrook
- Springdale
- Springdale
- Springhole
- Springville
- Springwater
- Squaw Creek Village
- Squirrel Island
- Stacyville
- Stacyville Junction
- Stamps Island
- Stanhope
- Stanley
- Stanton