This is the fifth of six volumes of records of the Texas Rangers from 1847 until 1900 in an alphabetical listing. In addition to Texas Rangers with surnames from O to S, Volume 5 includes the Frontier Battalion and Companies; Minute Men and Companies, County Minute Men and Commanding Officers; County Frontier Battalions and Commanding Officers and Miscellaneous units. Many of the early records are not extant as they were in private hands or just lost in time. These records are the ones that have survived and are now housed in the Texas State Archives as Muster Rolls and Pay Rolls.

Ranger entries include the full name of the Ranger, rank, unit, dates of enlistment and discharge, and frequently age and place of residence. This volume also includes a surname index.