Monroe County owns and maintains multiple historic properties, four of which have been developed into museums:
Monroe County also maintains several other historic properties. They include:
- 1890 Courthouse in Key West
- 1916 Gato Cigar Factory now serving as government offices in Key West
- 1914 Truman School now serving the public as the Harvey Government Center in Key West
- 1892/1910 Key West Jail
- 1936 Tavernier School