 DeKalb County saw one of the highest death tolls in Alabama during a massive tornadic system in April 2011, the 2011 Super Outbreak, with 31 deaths reported in the county.According to the U.S. Census Bureau, the county has a total area of , of which is land and (0.2%) is water.As of the census of 2010, there were 71,109 people, 26,842 households, and 19,361 families living in the county.