National Register of Historical Places - Washington County
- Provides a listing of properties, districts, and landmarks in the county. Includes architectural style and period of significance
- http://www.historicdistricts.com/IA/Washington/state.html

The Political Graveyard: Washington County, Iowa
- Database provides political history, cemetery locations, and brief biographies of politicians who were born, lived or died in the county.
- http://politicalgraveyard.com/geo/IA/WA.html#BORN