| Locality | Postal Code |
|---|---|
| Postal/ZIP Codes in Shimonecho (牛久市) | 300-1203 |
| Postal/ZIP Codes in Shinchicho (牛久市) | 300-1225 |
| Postal/ZIP Codes in Shishikocho (牛久市) | 300-1231 |
| Postal/ZIP Codes in Shobeeshindencho (牛久市) | 300-1224 |
| Postal/ZIP Codes in Shojikicho (牛久市) | 300-1285 |
| Postal/ZIP Codes in Tagu (牛久市) | 300-1237 |
| Postal/ZIP Codes in Tagucho (牛久市) | 300-1236 |
| Postal/ZIP Codes in Toyamacho (牛久市) | 300-1215 |
| Postal/ZIP Codes in Ushikucho (牛久市) | 300-1221 |