Wikipedia: Cass County, Iowa
- Encyclopedia article presents geography, demographics. history and links to cities and towns. Includes maps.
- http://en.wikipedia.org/wiki/Cass_County,_Iowa

City-Data.com: Cass County, Iowa
- Profiles population demographics, jobs, housing, agriculture and crime statistics. Contains a list of recreational areas, churches, cemeteries, post offices, charts, graphs and maps.
- http://www.city-data.com/county/Cass_County-IA.html

Cass County , Iowa - US Census Bureau
- Provides population, demographic, and housing information.
- http://quickfacts.census.gov/qfd/states/19/19029.html

Cass County Iowa
- Presents its history, services, holiday schedule and links to departments, offices and communities.
- http://www.casscountyiowa.org/

Cass County Memorial Hospital
- 90-bed inpatient facility meeting a wide range of medical needs. Includes details of services, visitors guide, job opportunities, educational services, support groups, outpatient clinics information, newborn news. Located in Atlantic.
- http://www.casshealth.org/

Iowa State University Extension - Cass County
- Offers agricultural, business, family and 4-H programs and resources. Includes staff directory, news, events, hours and directions. Located in Atlantic.
- http://www.extension.iastate.edu/cass/

Cass County Conservation Board
- Provides recreational opportunities and conservation programs. Includes FAQs, park directory, annual events, volunteer opportunities and staff profiles. Located in Atlantic.
- http://www.atlantic.k12.ia.us:16080/~cccb/

Cass/Atlantic Development Corporation
- Directs economic development initiatives and assists organizations to enhance the quality of life in the county. Includes information about the communities, workforce, demographics, transportation, utilities and available properties. Located in Atlantic.
- http://www.cassatlanticdevelopment.com/

Botna Valley Web Directory
- Web hosting, Internet consulting and website design. Free local web and other services.
- http://www.botnavalley.com