U.S. 1 Mile Marker 0

Mile Marker 0 is the green-and-white highway sign at Whitehead and Fleming streets in Old Town Key West. It marks the southern end of U.S. Route 1: the finish line for many drivers coming down the Overseas Highway, and mile zero for the road heading north. It is a small street-corner landmark, separate from the Southernmost Point buoy about a kilometer away.

There are signs on both sides of Whitehead, and visitors say the larger one across the street makes the better picture. It is an easy, quick photo stop rather than an attraction to spend long at. This is a live street corner; use the sidewalk and treat it as a stop during an Old Town walk.

The marker is one block from Duval Street, so it is simple to add to a walk through central Key West. A dedicated lot or visitor facilities are not identified for the sign; plan to park legally elsewhere and walk over rather than expecting a place to pull in at the marker.

The Keys' first road route was State Road 4A in the mid-1920s. The modern Overseas Highway route was established in 1944, generally following the path cleared for the Florida East Coast Railway's Over-Sea Railroad. That history is what gives a modest corner sign its road-trip meaning: it marks the point where U.S. 1 starts north through the island chain.