Naval Air Station Key West is located on Boca Chica Key, Monroe County, Florida. It is the second-to-last major island in the Florida Keys. NAS Key West has several annexes throughout Monroe county as well as Key West itself. Key West is the southernmost city in the continental United States. It is 1.5 miles wide and 4 miles long; it sits 93 miles north of Cuba, 163 miles southwest of Miami and 24.5 degrees above the equator.