Southside Post Office
16731 Santa Ana Ave, Fontana, CA 92337
Retail Hours
| Sunday | Closed |
| Monday | 10:00 AM - 5:00 PM |
| Tuesday | 10:00 AM - 5:00 PM |
| Wednesday | 10:00 AM - 5:00 PM |
| Thursday | 10:00 AM - 5:00 PM |
| Friday | 10:00 AM - 5:00 PM |
| Saturday | Closed |
Contact Info
| Phone | 909-350-3466 |
| Fax | 909-350-3855 |
| TTY | 877-889-2457 |
| Toll Free | 1-800-275-8777 (1-800-Ask-USPS®) |
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