- Second Chain of Islands
- Second Corinth
- Second Crossing
- Second Crossing
- Second Roosevelt Colonia
- Security
- Sedalia
- Sedgewood
- Sedwick
- Seeligson
- Seger
- Segno
- Segovia
- Seguin
- Sejita
- Selden
- Selfs
- Selkirk Island
- Selma
- Selma
- Selman
- Selman City
- Seminary Estates Colonia
- Seminary South Colonia
- Seminary Village Colonia
- Seminole
- Senate
- Sendero Colonia
- Senterfitt
- Seqouia