| Locality | Postal Code |
|---|---|
| Postal/ZIP Codes in Takaoka (苫小牧市) | 053-0035 |
| Postal/ZIP Codes in Takasagocho (苫小牧市) | 053-0013 |
| Postal/ZIP Codes in Takuyuhigashimachi (苫小牧市) | 059-1303 |
| Postal/ZIP Codes in Takuyunishimachi (苫小牧市) | 059-1302 |
| Postal/ZIP Codes in Tarumae (苫小牧市) | 059-1265 |
| Postal/ZIP Codes in Tokaicho (苫小牧市) | 059-1301 |
| Postal/ZIP Codes in Tokiwacho (苫小牧市) | 059-1261 |
| Postal/ZIP Codes in Toyokawacho (苫小牧市) | 053-0831 |
| Postal/ZIP Codes in Uenae (苫小牧市) | 059-1365 |
| Postal/ZIP Codes in Usunosawacho (苫小牧市) | 053-0842 |
| Postal/ZIP Codes in Utonaikita (苫小牧市) | 059-1306 |
| Postal/ZIP Codes in Utonaiminami (苫小牧市) | 059-1307 |
| Postal/ZIP Codes in Wakakusacho (苫小牧市) | 053-0021 |
| Postal/ZIP Codes in Yamatecho (苫小牧市) | 053-0851 |
| Postal/ZIP Codes in Yanagimachi (苫小牧市) | 053-0053 |
| Postal/ZIP Codes in Yashirocho (苫小牧市) | 053-0803 |
| Postal/ZIP Codes in Yayoicho (苫小牧市) | 053-0802 |
| Postal/ZIP Codes in Yufutsu (苫小牧市) | 059-1372 |
| Postal/ZIP Codes in Hokuseicho (苫小牧市) | 059-1277 |
| Postal/ZIP Codes in Kinseicho (苫小牧市) | 059-1266 |