Post Offices List in Marathon City, Florida:
| Marathon Post Office | 5171 Overseas Hwy, Marathon, FL 33050 |
| Marathon Shores Post Office | 11400 Overseas Hwy Ste 120, Marathon, FL 33050 |
| Marathon Post Office | 5171 Overseas Hwy, Marathon, FL 33050 |
| Marathon Shores Post Office | 11400 Overseas Hwy Ste 120, Marathon, FL 33050 |