- Wild West History Association. The WWHA (successor organization to WOLA and NOLA) promotes the history of Old West outlaws and lawmen, publishes a quarterly Journal, and hosts an annual conference.
- The English Westerners’ Society. The society is dedicated to the study of American frontier history.
- Westerners International. WI promotes research and interest in the history of the American West.
- The Museum of Northwest Colorado. The museum is dedicated to highlighting the history of the region, including events that took place in Brown’s Park, a nearby Wild Bunch hangout.
- Colorado Historical Society. Publications, educational programs, and collections of historical artifacts and records about Colorado are among CHS’s offerings.
- Utah State Historical Society. The USHS operates a museum and provides educational and research services in an effort to preserve and share the state’s past.
- Wyoming State Historical Society. The WSHS promotes the study and interpretation of the state’s history. Its website includes an index of articles published in the Annals of Wyoming.
- Montana Historical Society. Provides information about the society, which operates a museum, maintains archives, and publishes material devoted to preserving the history of Montana.
- Uintah County Regional History Center. The center publishes the semi-annual Outlaw Trail Journal and serves as a resource for historical information on the “greater Uinta Basin, the Intermountain west, and the Outlaw Trail.”