There are 9 zip codes in Monroe County, Florida. The most populated is 33040, located in Key West. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
3304036,379Key West
3303713,265Key Largo
3305010,520Marathon
330426,990Summerland Key
330705,717Tavernier
330434,547Big Pine Key
330363,620Islamorada
33051650Key Colony Beach
33001340Long Key

Zip Codes in Monroe County, Florida by Population (2024)