In 2003, there were over 1,000 regional, national, and international organizations within the state. Among the national organizations with headquarters in Arkansas are the American Crossbow Association in Huntsville; the American Fish Farmers Federation in Lonoke; and the Ozark Society, the American Parquet Association, the Federation of American Hospitals, and the Civil War Round Table Associates, all located in Little Rock. There is an active chapter of the Knights of the Ku Klux Klan in Harrison.
ACORN, the Association of Community Organizations for Reform Now, was founded in Little Rock in 1970 and has since spread to some 20 other states and has become one of the most influential citizens' lobbies in the US.