The Political Graveyard: Sioux County, Nebraska
- Database provides brief biographies of politicians who were born or lived in the county and political history.
- http://politicalgraveyard.com/geo/NE/SX.html

Sioux County - NEGenWeb
- Browse queries, surnames, a genealogy database, history of the county and related resource links.
- http://www.rootsweb.com/~nesioux/

Sioux County Government
- Contains event calendar, list of offices and officers, services provided and links.
- http://www.co.sioux.ne.us/

Sioux County Extension Office
- Information includes staff, board, educational opportunities, and publications.
- http://www.sioux.unl.edu/