Post Offices List in La Mesa City, California:
| Grossmont Post Office | 5500 Grossmont Center Dr Ste 440, La Mesa, CA 91942 |
| La Mesa Annex Post Office | 6055 Lake Murray Blvd, La Mesa, CA 91942 |
| La Mesa Finance Post Office | 8064 Allison Ave, La Mesa, CA 91942 |