| Locality | Post Code |
|---|---|
| Sankyomachi (酒田市) | 998-0838 |
| Sannomiya (酒田市) | 999-6723 |
| Seki (酒田市) | 998-0805 |
| Sengokucho (酒田市) | 998-0843 |
| Sennichicho (酒田市) | 998-0014 |
| Setsuda (酒田市) | 999-8246 |
| Shimbashi (酒田市) | 998-0864 |
| Shimmachi (酒田市) | 999-6837 |
| Shimoaosawa (酒田市) | 999-8213 |
| Shimokurokawa (酒田市) | 999-8205 |
| Shimomochiyama (酒田市) | 999-6846 |
| Shimoyasucho (酒田市) | 998-0012 |
| Shinde (酒田市) | 999-8204 |
| Shingakujisawa (酒田市) | 999-6823 |
| Shinyashiki (酒田市) | 999-6832 |
| Shitase (酒田市) | 998-0837 |
| Sokojisawa (酒田市) | 999-6831 |
| Soneda (酒田市) | 999-8155 |