Black bear are located primarily in Garrett, Allegany, Washington, and Frederick counties. Populations are highest in Garrett and Allegany counties, with numbers continuing to rise throughout the western region of Maryland. Although evidence of a breeding population is confined to the western four counties, the Maryland Department of Natural Resources receives several bear sightings and complaints in central and southern Maryland counties each year. Bears are the largest mammals in Maryland. Adult bears usually weigh between 125 and 400 pounds, although bears weighing 600 pounds or more are not uncommon.