Capitol Impact: Allen County
- Political, educational, and economic data.
- http://www.capitolimpact.com/gw/cntydetail.asp?state=ky&stfips=21&stname=Kentucky&fips=21003

National Association of Counties - Allen County Data
- Contains a list of elected officials, cities within the county, census details, and contact details for the county court house.
- http://www.naco.org/Template.cfm?Section=Find_a_County&Template=/cffiles/counties/county.cfm&id=21003

Allen County Decennial Population Statistics - 1820 - 1990
- Includes total population, county area, and population density.
- http://ukcc.uky.edu/~census/21003.txt

Allen County Kentucky
- Provides government information, forms, licenses, and contact details.
- http://www.allencountykentucky.com

U.S. Census Bureau - Allen County Quick Facts
- Provides population and economic information.
- http://quickfacts.census.gov/qfd/states/21/21003.html