Handbook of Texas Online
- Current and historical information about Hamilton County.
- http://www.tsha.utexas.edu/handbook/online/articles/HH/hch3.html

Hamilton County Genealogical Society
- Site contains local information, publications and event calendar. contact information provided.
- http://websites.hamiltontexas.com/hamiltongenealogylibrary/

Hamilton County Public Library
- A small town public Library in central Texas.
- http://www.hamilton-public-library.org/

The Political Graveyard: Hamilton County
- Lists politicians who lived or died in the county.
- http://www.politicalgraveyard.com/geo/TX/HM.html

Hamilton County
- Lists contact information for county and district court offices and includes a map and demographic information.
- http://www.co.hamilton.tx.us/

The Hamilton Herald-News
- Newspaper for Hamilton County, Texas with real estate, news, and entertainment.
- http://www.herald-news.com/

Amphibians and Reptiles in Hamilton County
- Texas Cooperative Wildlife Collection list of species found in the county.
- http://wfscnet.tamu.edu/tcwc/checklist/HAMIL097.HTM