The Northeast Iowa Regional Directory Yellow Pages 2007-2008
- Provides a directory of businesses for Elgin, Elkader, Garber, Garnavillo, Guttenberg, Marquette and McGregor.
- http://www.alpinecom.net/directories/

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

Clayton County Libraries
- Information center lists locations, hours, events, and librarians' pick of the month selections. Includes online catalog search.
- http://www.claytoncounty.lib.ia.us/

Clayton 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/Clayton_County-IA.html

Clayton County, Iowa - US Census Bureau
- Provides population, demographic, and housing information.
- http://quickfacts.census.gov/qfd/states/19/19043.html

Clayton County Conservation Board
- Acquires, develops, maintains, and makes available to the citizens of the county forests, wildlife and other conservation areas. Includes staff profiles, park descriptions, volunteer opportunities, newsletters and FAQs. Located in Elkader.
- http://www.claytoncountyconservation.org/

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

MFL MarMac Community School District
- Comprised of the communities of Monona, Farmersburg, Luana, Marquette and McGregor. Includes calendars, menus, information about the curriculum and links to the buildings.
- http://www.mflmarmac.k12.ia.us/

Clayton Ridge Schools
- Includes events calendar, lunch menu, alumni directory, and details for each school in Garnavillo and Guttenberg.
- http://www.claytonridge.k12.ia.us/

The Clayton County Fair
- Held annually in early August. Includes entertainment and events schedules, general admission information, and facility rental fees.
- http://www.claytoncountyfair.com/

Clayton County
- Web site for tourism and economic development in Clayton County, Iowa. Featuring attractions in Elkader, Strawberry Point, Guttenberg, and other communities.
- http://www.claytoncountyiowa.com/

Hydrogeology, Water Quality, and Land Management
- Description of the Big Spring study conducted by several government agencies in Clayton County, Iowa.
- http://www.igsb.uiowa.edu/pubs/abstract/ofr833.htm