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41.03 miles
It is 50 miles taking I-71 NORTH to SR-73 EAST to WILMINGTON at EXIT 45, and then taking SR-73 EAST into Wilmington.
The distance from Wilmington, Ohio, to Philadelphia, Pennsylvania, is 463 air miles. That equals 745 kilometers or 402 nautical miles.
It is 158 miles according to Google Maps.
Consider North Carolina, Delaware, Massachusetts or Ohio.