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