Wikipedia: Mahaska County, Iowa
- Encyclopedia article covers geography, demographics and links to localities. With maps and photograph of the courthouse.
- http://en.wikipedia.org/wiki/Mahaska_County,_Iowa

City-Data.com: Mahaska 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/Mahaska_County-IA.html

Mahaska County Izaak Walton League
- Dedicated to conserve, maintain, protect and restore the soil, forest, water and other natural resources. Includes membership application and events.
- http://www.mahaskacountyikes.org/

Mahaska County, Iowa - US Census Bureau
- Provides population, demographic, and housing information.
- http://quickfacts.census.gov/qfd/states/19/19123.html

Southern Iowa Fair
- Held annually in July. Includes fair and non-fair schedules of events, list of sponsors, information about camping and directions. Located in Oskaloosa.
- http://southerniowafair.com/

Mahaska Communication Group (MCG)
- Offering high speed Internet, Digital TV and music, and telephone services to residential and business customers. Includes details, pricing, newsletter, account center and construction schedule map. Located in Oskaloosa.
- http://www.mahaska.org/

Mahaska County Conservation Board
- Contains a directory of recreational areas, current events, newsletter, fees and reservations, information about hunting and fishing, and activity page for kids.
- http://www.mahaskaconservation.com/

Mahaska County YMCA
- Dedicated in 1903 and located in Oskaloosa. Provides information about activities and programs, staff directory, and hours.
- http://www.mahaskacountyymca.com/

Mahaska County
- Official web site of county government. History, directory of departments, news items, maps available online.
- http://www.mahaskacounty.org/

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