| Locality | Postal Code |
|---|---|
| Postal/ZIP Codes in Ukai Toinokuchi (滝沢市) | 020-0677 |
| Postal/ZIP Codes in Ukai Toshimo (滝沢市) | 020-0678 |
| Postal/ZIP Codes in Ukai Ubayashiki (滝沢市) | 020-0681 |
| Postal/ZIP Codes in Ushiro (滝沢市) | 020-0601 |
| Postal/ZIP Codes in Utozaka (滝沢市) | 020-0615 |
| Postal/ZIP Codes in Yaheibayashi (滝沢市) | 020-0607 |
| Postal/ZIP Codes in Yanagihara (滝沢市) | 020-0609 |
| Postal/ZIP Codes in Yanagisawa (滝沢市) | 020-0612 |
| Postal/ZIP Codes in Yubunezawa (滝沢市) | 020-0617 |