| Locality | Postal Code |
|---|---|
| Araomachi (東海市) | 476-0003 |
| Araomachimizubuka (東海市) | 476-0004 |
| Asayama (東海市) | 476-0006 |
| Chuomachi (東海市) | 476-0013 |
| Fukinodai (東海市) | 476-0014 |
| Fukishimamachi (東海市) | 476-0011 |
| Fukishimamachifushimi (東海市) | 476-0012 |
| Kagiyamachi (東海市) | 477-0032 |
| Minamishibatamachi (東海市) | 476-0001 |
| Motohamamachi (東海市) | 477-0035 |
| Nakanoike (東海市) | 477-0033 |
| Nawamachi (東海市) | 476-0002 |
| Otamachi (東海市) | 477-0031 |
| Others (東海市) | 476-0000 |
| Shimpomachi (東海市) | 476-0005 |
| Takayokosukamachi (東海市) | 477-0037 |
| Tokaimachi (東海市) | 476-0015 |
| Yabumachi (東海市) | 477-0034 |
| Yokosukamachi (東海市) | 477-0036 |