Monroe County, Florida

county in Florida, United States

Monroe County is a county in the U.S. state of Florida. It was formed on July 3, 1823. As of 2020, the population is 82,874.[1] Its county seat is Key West.

Monroe County
The Monroe County Courthouse in Key West
The Monroe County Courthouse in Key West
Flag of Monroe County
Official seal of Monroe County
Map of Florida highlighting Monroe County
Location within the U.S. state of Florida
Map of the United States highlighting Florida
Florida's location within the U.S.
Coordinates: 25°07′N 81°09′W / 25.12°N 81.15°W / 25.12; -81.15
Country United States
State Florida
FoundedJuly 3, 1823
Named forJames Monroe
SeatKey West
Largest cityKey West
 • Total3,738 sq mi (9,680 km2)
 • Land983 sq mi (2,550 km2)
 • Water2,754 sq mi (7,130 km2)  73.7%
 • Total82,874
 • Density22/sq mi (8/km2)
Time zoneUTC−5 (Eastern)
 • Summer (DST)UTC−4 (EDT)

Monroe County includes a part of the Florida mainland, and many small islands called the Florida Keys. Almost nobody lives in the mainland of the county. It is all wetland, part of the Everglades. Nearly everybody in the county lives on the islands.


  1. 1.0 1.1 "QuickFacts: Monroe County, Florida". United States Census Bureau. Retrieved August 10, 2023.