Onondaga Post Office
5555 Oak St, Onondaga, MI 49264
Retail Hours
| Sunday | Closed |
| Monday | 8:00 AM - 11:00 AM |
| Tuesday | 8:00 AM - 11:00 AM |
| Wednesday | 8:00 AM - 11:00 AM |
| Thursday | 8:00 AM - 11:00 AM |
| Friday | 8:00 AM - 11:00 AM |
| Saturday | 8:00 AM - 10:00 AM |
Contact Info
| Phone | 517-628-2232 |
| Fax | 517-628-2161 |
| TTY | 877-889-2457 |
| Toll Free | 1-800-275-8777 (1-800-Ask-USPS®) |
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