9 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 33040 | Key West | 36,091 |
| 33037 | Key Largo | 13,674 |
| 33050 | Marathon | 10,586 |
| 33042 | Summerland Key | 6,781 |
| 33070 | Tavernier | 5,614 |
| 33043 | Big Pine Key | 4,632 |
| 33036 | Islamorada | 3,632 |
| 33051 | Key Colony Beach | 525 |
| 33001 | Long Key | 254 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 9 ZCTAs in Monroe County, Florida (US Census).