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
City
Population
33040Key West36,379
33037Key Largo13,265
33050Marathon10,520
33042Summerland Key6,990
33070Tavernier5,717
33043Big Pine Key4,547
33036Islamorada3,620
33051Key Colony Beach650
33001Long Key340

Monroe County, Florida Zip Codes by Population (2024)