 Coudersport lies in a broad valley at the joining of the Allegheny River and Mill Creek.It is surrounded by the great hilltop plateaus of the Allegheny highlands.Highways enter north and south on Pennsylvania Route 44, the very old Jersey Shore (log road) Turnpike, and from west to east on U.S. Route 6, the "Grand Army of the Republic Highway", which had been long a major mid-east-states east-west corridor before Interstate highways of the late 1950s.