Capitol Impact: Barren County
- Political, educational, and economic data.
- http://www.capitolimpact.com/gw/cntydetail.asp?state=ky&stfips=21&stname=Kentucky&fips=21009

NACo - Barren County, Kentucky
- Provides a list of elected officials, cities within the county, and census details. Learn about the county seat and the year organized.
- http://www.naco.org/Template.cfm?Section=Find_a_County&Template=/cffiles/counties/county.cfm&id=21009

Barren County Decennial Population Statistics - 1800 - 1990
- Includes total population, county area, and population density.
- http://ukcc.uky.edu/~census/21009.txt

Census Bureau - Barren County
- Provides population and economic information.
- http://quickfacts.census.gov/qfd/states/21/21009.html