| Locality | Postal Code |
|---|---|
| Postal/ZIP Codes in Iitagawa Iizuka (潟上市) | 018-1504 |
| Postal/ZIP Codes in Iitagawa Kaneyama (潟上市) | 018-1501 |
| Postal/ZIP Codes in Iitagawa Shimoabukawa (潟上市) | 018-1502 |
| Postal/ZIP Codes in Iitagawa Wadaimokawa (潟上市) | 018-1503 |
| Postal/ZIP Codes in Others (潟上市) | 018-1400 |
| Postal/ZIP Codes in Showa Hatchome (潟上市) | 018-1403 |
| Postal/ZIP Codes in Showa Midarebashi (潟上市) | 018-1402 |
| Postal/ZIP Codes in Showa Okubo (潟上市) | 018-1401 |
| Postal/ZIP Codes in Showa Toyokawafunabashi (潟上市) | 018-1413 |
| Postal/ZIP Codes in Showa Toyokawakamiabukawa (潟上市) | 018-1411 |
| Postal/ZIP Codes in Showa Toyokawaokaido (潟上市) | 018-1412 |
| Postal/ZIP Codes in Showa Toyokawaryuge (潟上市) | 018-1415 |
| Postal/ZIP Codes in Showa Toyokawatsukinoki (潟上市) | 018-1414 |
| Postal/ZIP Codes in Showa Toyokawayamada (潟上市) | 018-1416 |
| Postal/ZIP Codes in Tenno (潟上市) | 010-0101, 010-0201 |
| Postal/ZIP Codes in Tenno Osaki (潟上市) | 010-0202 |