Wikipedia: Greene County, Iowa
- Encyclopedia article covers geography, demographics and links to cities and towns. With maps.
- http://en.wikipedia.org/wiki/Greene_County,_Iowa

Greene County Development Corporation
- Spotlights business expansion and development, quality of life, tourism and communities. Includes links to member profiles and area map.
- http://www.greenecountyiowadevelopment.org/

Greene County, Iowa - US Census Bureau
- Provides population, demographic, and housing information.
- http://quickfacts.census.gov/qfd/states/19/19073.html

Greene Soil & Water Conservation District
- Contains mission statement, history, information about programs, conservation practices, backyard conservation and links to partners. Located in Jefferson.
- http://greeneswcd.org/

Greene County, Iowa
- Contains brief history, links to departments, FAQs and office hours.
- http://www.co.greene.ia.us/

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