Cass County - NEGenWeb
- Contains searchable pages with links to genealogy archives, vital records, lookups and biographies. Includes photographs and maps.
- http://www.rootsweb.com/~necass/

Cass County Historical Society Museum
- Tells the history of the county since its settlement in 1854. Includes details of exhibits, photographs, a calendar of events, hours and admission fees. Located in Plattsmouth.
- http://www.nebraskamuseums.org/casscountymuseum.htm

Cass County
- Includes offices, public meetings, and historical information.
- http://www.cassne.org/

Visit Cass County Nebraska
- Official tourism site, offering information about recreation, attractions, lodging, shopping, and meeting sites in Cass County. Includes a calendar of events.
- http://www.visitcasscounty.com/