Crossville is a town in DeKalb County, Alabama, United States. At the 2010 census the population was 1,862, up from 1,431 in 2000. Crossville is located atop Sand Mountain, a southern extension of the Cumberland Plateau.

DeKalb County is a county located in the northeastern part of the U.S. state of Alabama. As of the 2020 census, the population was 71,608. Its county seat is Fort Payne, and it is named after Major General Baron Johan DeKalb. DeKalb County is part of the Huntsville-Decatur-Albertville, AL Combined Statistical Area.