Coal Run is a long 2nd order tributary to Chartiers Creek in Allegheny and Washington Counties, Pennsylvania.
Coal Run rises about 0.25 miles southeast of Cecil, Pennsylvania and then flows northeast to join Chartiers Creek across from Bridgeville.
Coal Run drains of area, receives about 38.8 in/year of precipitation, has a wetness index of 326.44, and is about 43% forested.