Gulph Mills is an unincorporated community that is located in Upper Merion Township, Montgomery County, Pennsylvania.

A grist mill built here in 1747 supplied flour to Continental Army troops during their stay at Valley Forge.

General George Washington's army encamped in the area for a week before departing for winter quarters at Valley Forge.

Hanging Rock reportedly holds importance as a place by which George Washington led his troops.

The Bridge in Upper Merion Township and Hanging Rock are listed on the National Register of Historic Places.