Post Offices List in Plainfield City, New Jersey:
| Muhlenberg Post Office | 1080 Arlington Ave, Plainfield, NJ 07060 |
| Plainfield Post Office | 201 Watchung Ave, Plainfield, NJ 07060 |
| Netherwood Post Office | 1120 North Ave, Plainfield, NJ 07062 |
| Sta A Plainfield Post Office | 14 Clinton Ave, Plainfield, NJ 07063 |
| North Plainfield Post Office | 9 Jackson Ave, Plainfield, NJ 07060 |