Ellerslie is an unincorporated community and census-designated place in Allegany County, Maryland, United States. As of the 2010 census it had a population of 572. Ellerslie is part of the Cumberland, MD-WV Metropolitan Statistical Area.The town lies along Maryland Route 35, 7 miles north of Cumberland next to the Pennsylvania-Maryland state line. To the north, Pennsylvania Route 96 extends 8 miles to Hyndman, Pennsylvania and 31 miles to Bedford, Pennsylvania. Ellerslie is situated in the valley of Wills Creek, between the parallel ridges of Little Allegheny Mountain to the west and Wills Mountain to the east.