Post Offices List in Fullerton City, California:
| Commonwealth Post Office | 202 E Commonwealth Ave, Fullerton, CA 92836 |
| Fullerton Post Office | 1350 E Chapman Ave, Fullerton, CA 92834 |
| Orangehurst Post Office | 1920 W Commonwealth Ave, Fullerton, CA 92837 |
| Sunny Hills Post Office | 1820 N Sunnycrest Dr, Fullerton, CA 92838 |