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

City-Data.com: Calhoun 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/Calhoun_County-IA.html

Calhoun County, Iowa - US Census Bureau
- Provides population, demographic, and housing information.
- http://quickfacts.census.gov/qfd/states/19/19025.html

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

Calhoun County REC
- Electric power cooperative serving Calhoun and areas of Webster, Sac, Pocahontas and Green Counties. Provides information about products and services, newsletter, forms for members, photographs and resource links. Located in Rockwell City.
- http://www.calhounrec.coop/

Twin Lakes, Iowa
- News, events, activities, business and community information for the region.
- http://www.twinlakesiowa.com/

Calhoun County, Iowa
- Provides an overview, a visitor's guide, descriptions of communities and their locations, events, and information about county offices.
- http://calhoundev.com/

Calhoun County Iowa 1895
- A map of the county from an 1895 atlas.
- http://www.livgenmi.com/1895/IA/County/calhoun.htm

District Information
- Provides General Assembly district information, and officeholders.
- http://www2.legis.state.ia.us/GA/76GA/Counties/Calhoun.html