Point of Rocks is an unincorporated community and census-designated place (CDP) in Frederick County, Maryland, United States. As of the 2010 census it had a population of 1,466. It is named for the striking rock formation on the adjacent Catoctin Mountain, which was formed by the Potomac River cutting through the ridge in a water gap, a typical formation in theAppalachian Mountains. The formation is not visible from the town and can only be seen from boats on the river, or from the southern bank of the river in Virginia.
In 1828, the narrow passage between the river and Catoctin Mountain at this site provoked a violent legal battle between the Chesapeake and Ohio (C&O) Canal Company and the B&O Railroad over who could have control of the narrow pass. After years of disputes, both companies finally compromised and allowed both canal and railroad to build on the right-of-way through the passage, with a wall between the two to avoid trains scaring the mules that pulled the canal boats.