NAMI - Cleveland County Oklahoma
- Dedicated to the eradication of mental illnesses. Includes membership information, advocacy library, calendar of events and other resources. Located in Norman.
- http://www.namiclevelandcounty.org/

The Political Graveyard: Cleveland County, Oklahoma
- Database provides political history, cemetery locations, and brief biographies of politicians who lived in the county.
- http://politicalgraveyard.com/geo/OK/CV.html#CEM

Cleveland County Demographics
- Provides report from the U.S. Bureau of the Census, Census 2000. [PDF file]
- http://staging.okcommerce.gov/test1/dmdocuments/Clevel_County_Demographics_061004293.pdf