Post Offices List in Union City City, California:
| Alvarado Post Office | 3861 Smith St, Union City, CA 94587 |
| Union City Post Office | 33170 Alvarado Niles Rd, Union City, CA 94587 |
| Alvarado Post Office | 3861 Smith St, Union City, CA 94587 |
| Union City Post Office | 33170 Alvarado Niles Rd, Union City, CA 94587 |