| Locality | Postal Code |
|---|---|
| Postal/ZIP Codes in Fujimoto (国分寺市) | 185-0031 |
| Postal/ZIP Codes in Higashikoigakubo (国分寺市) | 185-0014 |
| Postal/ZIP Codes in Higashimotomachi (国分寺市) | 185-0022 |
| Postal/ZIP Codes in Higashitokura (国分寺市) | 185-0002 |
| Postal/ZIP Codes in Hikaricho (国分寺市) | 185-0034 |
| Postal/ZIP Codes in Hiyoshicho (国分寺市) | 185-0032 |
| Postal/ZIP Codes in Honcho (国分寺市) | 185-0012 |
| Postal/ZIP Codes in Honda (国分寺市) | 185-0011 |
| Postal/ZIP Codes in Izumicho (国分寺市) | 185-0024 |
| Postal/ZIP Codes in Kitamachi (国分寺市) | 185-0001 |
| Postal/ZIP Codes in Minamicho (国分寺市) | 185-0021 |
| Postal/ZIP Codes in Naito (国分寺市) | 185-0033 |
| Postal/ZIP Codes in Namikicho (国分寺市) | 185-0005 |
| Postal/ZIP Codes in Nishikoigakubo (国分寺市) | 185-0013 |
| Postal/ZIP Codes in Nishimachi (国分寺市) | 185-0035 |
| Postal/ZIP Codes in Nishimotomachi (国分寺市) | 185-0023 |
| Postal/ZIP Codes in Others (国分寺市) | 185-0000 |
| Postal/ZIP Codes in Shimmachi (国分寺市) | 185-0004 |
| Postal/ZIP Codes in Takagicho (国分寺市) | 185-0036 |
| Postal/ZIP Codes in Tokura (国分寺市) | 185-0003 |