Mount Vernon sits at a strategic bend in the Ohio River, where the landscape transitions from industrial riverfront to the agricultural plains of Posey County. The river’s influence is clear, from the large Mount Vernon Towhead Island and Towhead Island to the network of drainage systems like Big Creek Slough and Spencer Ditch. These waterways historically dictated the settlement patterns of outlying communities like Grafton, Upton, and Hovey. The transport infrastructure is anchored by CSX Transportation rail lines and the Parrish Airport, supporting the region's shipping and logistical needs.
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1903 · New Harmony
USGS Topo · 1:62,500
1903 · Patoka
USGS Topo · 1:125,000
1905 · New Haven
USGS Topo · 1:62,500
1906 · New Haven
USGS Topo · 1:62,500
1917 · Uniontown
USGS Topo · 1:62,500
1938 · New Harmony
USGS Topo · 1:62,500
1940 · Carmi
USGS Topo · 1:62,500
1943 · Carmi
USGS Topo · 1:62,500
1949 · Paducah
USGS Topo · 1:250,000
1949 · New Haven
USGS Topo · 1:62,500