Historic Bridges of the U.S. : Bridges in Clay County, Iowa
- Database provides overview, status, history and categories of bridges in the county. Includes photographs.
- http://www.bridgehunter.com/ia/clay/

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

Clay County Networkers
- Non-profit organization providing tourist information for the county and the surrounding area. Includes an overview of the county, information about businesses and services, places to go, dining, recipes, community links, and events.
- http://www.travelclaycountyiowa.com//aboutus.htm

City-Data.com: Clay 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/Clay_County-IA.html

Clay County, Iowa - US Census Bureau
- Provides population, demographic, and housing information.
- http://quickfacts.census.gov/qfd/states/19/19041.html

Clay County Assessor
- Provides general information about the position, duties and market value. Includes parcel, residential, commercial and agricultural land sale search. Located in Spencer.
- http://clay.iowaassessors.com/

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

Clay County Fair
- Held annually in September. Includes fair history, schedules, photos and map. Located in Spencer.
- http://www.claycountyfair.com/

Clay County Iowa
- Your guide to Clay County, Iowa government offices, conservation area, recreation, golf courses, and museums. Includes information on each office, search the Board of Spencer minutes and view pictures of native prairie plants as well as links to lacal sit
- http://www.co.clay.ia.us/