| Locality | Postal Code |
|---|---|
| Aburatsu (日南市) | 887-0001 |
| Agatahigashi (日南市) | 887-0041, 889-2541 |
| Agatanishi (日南市) | 889-2536 |
| Chuodori (日南市) | 887-0021 |
| Futo (日南市) | 887-0102 |
| Haginomine (日南市) | 889-3153 |
| Higashibembun Ko (日南市) | 889-2522 |
| Higashibembun Otsu (日南市) | 889-2521 |
| Hirano (日南市) | 887-0015 |
| Hirayama (日南市) | 887-0033 |
| Hommachi (日南市) | 889-2531 |
| Hoshikura (日南市) | 889-2533 |
| Ibii (日南市) | 887-0111 |
| Imamachi (日南市) | 889-2525 |
| Itajiki (日南市) | 889-2532 |
| Iwasaki (日南市) | 887-0014 |
| Kamihiranocho (日南市) | 887-0022 |
| Kamikata (日南市) | 889-3151 |
| Kasugacho (日南市) | 887-0006 |
| Kazeda (日南市) | 887-0034 |
| Keyoshida (日南市) | 889-3152 |
| Kitagocho Gonohara (日南市) | 889-2402 |
| Kitagocho Kitagawachi (日南市) | 889-2403 |
| Kitagocho Ofuji (日南市) | 889-2401 |
| Kiyama (日南市) | 887-0013 |
| Kumaya (日南市) | 887-0023 |