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

City-Data.com: Grundy 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/Grundy_County-IA.html

Grundy County, Iowa - US Census Bureau
- Provides population, demographic, and housing information.
- http://quickfacts.census.gov/qfd/states/19/19075.html

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

Grundy County REC
- Provides service to Grundy, Black Hawk, Marshall, Tama, Butler and Hardin counties. Includes products, services, and news.
- http://www.grundycountyrecia.com/

Grundy County Memorial Hospital
- Provides 25-bed critical access hospital and long-term care unit in Grundy Center. Includes information about services, physicians and clinics, employment and physician calendar.
- http://www.grundycountyhospital.org/

Grundy County, Iowa
- Features information about departments, FAQs, census data and photographs.
- http://www.grundycounty.org/index2.asp?media=flash

Grundy County Fair
- Held annually in July in Grundy Center. Includes events, photographs, list of officials and rules.
- http://grundycountyfair.com/

Grundy County Conservation
- Provides information about its museum, parks, wildlife areas and trails. Includes articles, photos and a guest book.
- http://www.grundycountyconservation.com/

Grundy County Development Alliance
- Dedicated to assist the existing economic structure of the area and attract new businesses and industries. Includes a calendar of events, information about the quality of life, tourism and business development.
- http://www.grundycountyia.com/