Handbook of Texas Online: Dan Blocker
- Information on the actor who played Hoss Cartwright on the television series Bonanza. He was a native of O'Donnell.
- http://www.tsha.utexas.edu/handbook/online/articles/BB/fbl26.html

Handbook of Texas Online: O'Donnell
- Community history and information.
- http://www.tsha.utexas.edu/handbook/online/articles/OO/hjo1.html

O'Donnell, Texas
- Personal page of James O'Donnell, a visitor to the city, with some photographs.
- http://www.georgetown.edu/faculty/jod/texts/odonnell.texas.html

Dan Blocker's Monument: Roadside America
- Road report and review on the Monument to Dan Blocker, TV's Hoss Cartwright.
- http://www.roadsideamerica.com/attract/TXODOblocker.html

O'Donnell Independent School District
- Includes links to each campus, district information, and events.
- http://odonnell.esc17.net/

Texas Escapes: O'Donnell, Texas
- Information on history and attractions, Dan Blocker AKA Hoss Cartwright of Bonanza fame, and O'Donnell Museum.
- http://www.texasescapes.com/TexasPanhandleTowns/O'DonnellTexas/O'DonnellTx.htm

The Weather Channel - O'Donnell, Texas
- Local forecast, current conditions, radar, and links for national and international weather information.
- http://www.weather.com/weather/local/USTX0985?x=0&lswe=O%27Donnell%2C+tx&lswa=WeatherLocalUndeclared&GO=GO&whatprefs=&y=0

Organic Essentials
- Farmer-owned company offering organically grown cotton products free of chemicals, fungicides, herbicides, pesticides, and chlorine.
- http://www.organicessentials.com/