 It is named for the National Road (Cumberland Road), which was projected to run through it.According to the U.S. Census Bureau, the county has a total area of , of which is land and (0.3%) is water.In recent years, average temperatures in the county seat of Toledo have ranged from a low of in January to a high of in July, although a record low of was recorded in January 1985 (jobs) and a record high of was recorded in July 1954.