| Localité | Code postal |
|---|---|
| Scotch Plains, Union | 07076 |
| Springfield, Union | 07081 |
| Summit, Union | 07901 |
| Townley, Union | 07083 |
| Tremley, Union | 07036 |
| Tremley Point, Union | 07036 |
| Union, Union | 07083 |
| Union Square, Union | 07201 |
| Vauxhall, Union | 07088 |
| Westfield, Union | 07090 |
| Winfield Park, Union | 07036 |