- Shields
- Shiloh
- Shingleton
- Shiverette Island
- Shoe Island
- Shorecrest
- Shoreham
- Shorewood
- Shorewood Hills
- Shorewood-Tower Hills-Harbert
- Sickles
- Sid Town
- Sidnaw
- Sidney
- Siemens
- Sigma
- Silver Beach
- Silver City
- Silver Island
- Silver Lake View Mobile Home Park
- Silver Lawn Trailer Park
- Silver Shores Mobile Home Park
- Silverbrook Manufactured Home Community
- Silverwood
- Simmons
- Simmons Mobile Home Park
- Siskiwit Islands
- Sister Lakes
- Sisters Island
- Sitka