Allegany County is a county located in the northwestern part of the U.S. state of Maryland. As of the 2010 U.S. Census, the population was 75,087. Its county seat is Cumberland. The name Allegany may come from a local Lenape word, welhik hane or oolikhanna, which means 'best flowing river of the hills' or 'beautiful stream'. A number of counties in the Appalachian region of the US are named Allegany, Allegheny, or Alleghany.