mile markers

US 1 is used to travel the islands of the Florida Keys. Locations along the highway are expressed by Mile Marker numbers. The zero Mile Marker is found in Key West at the Monroe County Courthouse. Mile Marker numbers continue to increase until they pass through the Monroe County line at Mile Marker 112 north of Key Largo. Look for small green signs with white numbers posted at each mile along US1 (these used to be the original mile posts installed along the old railroad bed).

Special Note: mile marker references are commonly used in local addresses, when there is a -B or -O it simply denotes either Bayside or Oceanside location.