Lonoke County is Arkansas' 70th county, formed on April 16, 1873. The county name originates from a "lone oak" tree that stood on the site of the present county seat, Lonoke; the red oak tree was used as a local landmark by a railroad surveyor. While the county seat is at Lonoke, Cabot is the largest city in the county. Among Arkansas' 75 counties, it is the only one to share its name with its county seat.
Lonoke County is the location of the Camp Nelson Confederate Cemetery, Toltec Mounds State Park, and the Joe Hogan Fish Hatchery - one of the world's largest working state-owned fish hatcheries.
According to the 2000 census, the county has a total area of 802.43 square miles, of which 765.96 square miles is land and 36.47 square miles is water.
Lonoke County's population recorded 68,356 by the 2010 United States Census. Lonoke County is included in the Little Rock - North Little Rock - Conway Metropolitan Statistical Area in central Arkansas.