Post Offices List in Costa Mesa City, California:
| Costa Mesa Post Office | 1590 Adams Ave, Costa Mesa, CA 92628 |
| Mesa Center Post Office | 2230 Fairview Rd Ste C, Costa Mesa, CA 92627 |
| Costa Mesa Post Office | 1590 Adams Ave, Costa Mesa, CA 92628 |
| Mesa Center Post Office | 2230 Fairview Rd Ste C, Costa Mesa, CA 92627 |