Wikipedia: Harrison County, Iowa
- Encyclopedia article features geography, demographics and links to cities and towns. Includes maps.
- http://en.wikipedia.org/wiki/Harrison_County,_Iowa

Harrison County Fair
- Annual July event held in Missouri Valley. Includes schedule, events and photographs.
- http://www.harrisoncofair.com/

City-Data.com: Harrison 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/Harrison_County-IA.html

Harrison County, Iowa - US Census Bureau
- Provides population, demographic, and housing information.
- http://quickfacts.census.gov/qfd/states/19/19085.html

Harrison County Development Corporation
- Strives to promote, improve and aid economic, industrial, recreational, and tourism opportunities for the county. Includes newsletter, events and links to communities.
- http://www.hcdconline.com/

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

Harrison County REC
- Provides company profile, staff directory, products, news, service territory map, and links.
- http://www.hcrec.coop/

Harrison County Conservation Board
- Provides news, calendar of events, FAQs, newsletter, information about the Nature Encounter Center, fishing reports and hunting regulations. Located in Woodbine.
- http://www.harrisoncountyparks.org/

Harrison County, Iowa
- Official website covers information about local departments, employment, history, links to school districts, real estate data and GIS maps. Includes photographs and map.
- http://www.harrisoncountyia.org/