Capitolimpact.com Profile
- Local agencies and officials, with population and economic information.
- http://www.capitolimpact.com/gw/cntydetail.asp?state=sd&stfips=46&stname=South%20Dakota&fips=46037

Day County South Dakota GenWeb
- Genealogy and local history.
- http://www.rootsweb.com/~sdday/

Day County Extension Service
- Features 'Ask the Educator', calendar of events, news and articles, livestock/horticulture/agronomy reports, 4-H and youth programs, and family and consumer sciences.
- http://sdces.sdstate.edu/county.cfm?countyid=22

Day County Profile
- US Census Bureau information and inter-active tiger map of the county.
- http://quickfacts.census.gov/qfd/states/46/46037.html

The Political Graveyard
- Political history of Day County.
- http://politicalgraveyard.com/geo/SD/DY.html