| Business | Phone |
| Board Of County Commissioners 9400 Overseas Hwy, Marathon 33050 | (305) 289-6000 |
| Building Dept 2798 Overseas Hwy, Marathon 33050 | (305) 743-5405 |
| Code Enforcement 2798 Overseas Hwy # 330, Marathon 33050 | (305) 289-2556 |
| Florida Keys Mosquito Control 506 106th Street Gulf, Marathon 33050 | (305) 289-3705 |
| Stand Up For Animals 10550 Aviation Blvd, Marathon 33050 | (305) 743-3779 |
| Monroe Cnty Detention Facility 3981 Ocean Ter, Marathon 33050 | (305) 289-2420 |
| Monroe Cnty Key West/Gato Bldg Marathon 33050 | (305) 743-0079 |
| Monroe Cnty Key West/Stock Isl 5192 Overseas Hwy, Marathon 33050 | (305) 743-0079 |
| Monroe County Commissioners 500 Whitehead, Marathon 33050 | (305) 289-6054 |
| Monroe County Commissioners 9400 Overseas Hwy # 210, Marathon 33050 | (305) 292-3551 |
| Monroe County Emergency Comms 10600 Aviation Blvd, Marathon 33050 | (305) 743-7570 |
| Veterans Affairs 4963 63rd St Ocean # 100, Marathon 33050 | (305) 743-0079 |
| Monroe County Nutrition Prgrm 535 33rd St, Marathon 33050 | (305) 743-3346 |
| Monroe County Planning Dept 2798 Overseas Hwy # 400, Marathon 33050 | (305) 292-4400 |
| Monroe County Property Apprsr 2798 Overseas Hwy # 310, Marathon 33050 | (305) 289-2550 |
| Monroe County Veteran's Affair 490 63rd Street Ocean E # 100, Marathon 33050 | (305) 289-6009 |
| Planning Dept 2798 Overseas Hwy # 300, Marathon 33050 | (305) 289-2501 |