- John Hicks Adams (1830–1878), Sheriff, Santa Clara County, California, Deputy U.S. Marshal, Arizona Territory
- William "Red" Angus (1849–1922), Sheriff, Johnson County, Wyoming
- Ira Aten (1862–1953), Sheriff and Texas Ranger, Castro County, Texas
- Elfego Baca (1865–1945), New Mexico
- James W. Bell (18??–1881); Deputy Sheriff, Lincoln County, New Mexico
- Sam Bernard (1880–1964) Deputy Lincoln County, New Mexico, Hillsboro, New Mexico
- P.C. Baird (18??–1928), Sheriff and Texas Ranger, Mason County, Texas
- Mariano Barela (18??–18??) Sheriff and U.S. Marshal, Mesilla, New Mexico
- J.A. Bascom (1832–1912), Chief of Police, Mona town constable, Provo, Utah
- Charlie Bassett (1847–1896)
- John W. Bascom (1869–1947), Deputy Sheriff, Uintah County, Utah
- Johnny Behan (c. 1845 – 1912), Sheriff, Cochise County, Arizona Territory
- Charles Birkenfeld (c. 1910) Constable, Pima County, Arizona
- N. K. Boswell-{1841-1904} Sheriff, Laramie, Wyoming
- William Breakenridge (1846–1931), Deputy Sheriff and U.S. Marshal, Cochise County, Arizona Territory
- William L. Brooks (1832–1874), Marshal, Newton, Kansas and Dodge City, Kansas
- Hendry Brown (1857–1884), Marshal, Tascosa, Texas (ghost town) and Caldwell, Kansas
- Neal Brown (1850–????), Assistant Marshal, Dodge City, Kansas; U. S. Marshal, Oklahoma Territory
- Seth Bullock (1849–1919), Sheriff, Lewis and Clark County, Montana; Sheriff, Lawrence County, South Dakota; U. S. Marshal Dakota Territory
- Mathew Caldwell - (1798–1842) Gonzales Ranging Company of Mounted Volunteers 1836, Sheriff of Gonzales (Guadalupe, Dewitt, Caldwell, Lavaca) Counties 1837, Gonzales & Seguin Texas Rangers 1839
- Frank M. Canton - Joe Horner (1849–1927) Sheriff, Johnson County, Wyoming; Deputy U.S. Marshal, Oklahoma Territory; Under Sheriff, Q County, Oklahoma
- Charles Francis Colcord (1859–1934), Deputy U.S. Marshal, Oklahoma Territory; Chief of Police, Oklahoma, Oklahoma Territory
- David J. Cook (1842–1907), Marshal, Denver, Colorado
- Thomas Carl Cook (ca. 1880s), U.S. Marshal, Smith Center, Kansas
- "Longhair" Jim Courtright (1848–1887), Omaha, Nebraska Marshal, Marshal, Lake Valley, New Mexico; Sheriff, Fort Worth, Texas; Detective, Fort Worth, Texas
- Morgan Earp (1851–1882), Deputy Sheriff, Ford County, Kansas; Marshal, Butte, Montana; U.S. Deputy Marshal, Arizona Territory; Deputy Policeman/Marshal, Arizona Territory
- Virgil Earp (1843–1906) Deputy Policeman and Assistant Marshal, Dodge City, Kansas; Deputy Sheriff, Prescott, Arizona; Deputy Sheriff, Tombstone, Arizona; Marshal/Chief of Police, Tombstone, Arizona; U.S. Deputy Marshal, Arizona Territory; Sheriff, Colton, California; Deputy Sheriff Esmeralda County, Nevada
- Warren Earp (1855–1900), U. S. Deputy Marshal, Cochise County, Arizona Territory; Special Ranger (Arizona Cattleman's Association)
- Wyatt Earp (1848–1929), Constable, Lamar, Missouri; Marshal (for 1 hour), Ellsworth, Kansas; Deputy Policeman, Wichita, Kansas; Assistant Marshal, Dodge City, Kansas; Deputy Sheriff, Pima County, Arizona, Arizona Territory); Deputy Policeman and Assistant Marshal, Tombstone, Arizona, Arizona Territory; U.S. Deputy Marshal, Arizona Territory; Peace Commissioner, Dodge City, Kansas
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- Lee Hall (1849–1911), Texas Ranger.
- John Coffee Hays (1836–1848)," Captain Jack " leader of the Texas Rangers; 1st Sheriff of San Fransisco, Ca (1850)
- Wiley G. Haines (1860–1928), Undersheriff, County P, Oklahoma Territory; Deputy U.S. Marshal, Oklahoma Territory; Chief, Osage Indian Police.
- Jack Helm (c. 1838 – 1873), Sheriff, DeWitt County, Texas
- James Butler "Wild Bill" Hickok (1837–1876), Marshal, Abilene, Kansas and Hays City, Kansas
- John Henry "Doc" Holliday (1851–1887), Special Police Officer, Tombstone, Arizona Territory;Deputy U.S. Marshal Arizona Territory
- John R. Hughes (1855–1946), Texas Ranger.
- James B. Hume (1827–1904), Marshal, Placerville, California; Undersheriff, El Dorado County, California; Sheriff, El Dorado County, California; Chief Detective, Wells, Fargo & Co..
- John M. Larn (1849–1877), outlaw and Sheriff, Shackelford County, Texas
- James Franklin "Bud" Ledbetter (1852–1937), Deputy Sheriff, Johnson County, Arkansas; Deputy U.S. Marshal, Oklahoma Territory; Sheriff, Muskogee County, Oklahoma
- Isaiah W. Lees (1830–1902), Detective, San Francisco, California
- William Sidney "Cap" Light (1864–1893), Deputy Sheriff, Belton, Texas, Temple, Texas and Creede, Colorado
- Harry Love (1809–1868), Captain, California State Rangers (1853–1855).
- Steve "Big Steve" Long (unk–1868), outlaw and Deputy Marshal, Laramie, Wyoming Territory
- Leander H. McNelly (1844–1877), Texas Ranger
- Chris Madsen (1851–1944), U.S. Marshal, Oklahoma Territory
- Ed Masterson (1852–1878), Marshal, Dodge City, Kansas
- James Masterson (1855–1895), Dodge City, Kansas, Ford County, Kansas, Ingalls, Kansas, Deputy U.S. Marshal
- Bat Masterson (1853–1921), Deputy Sheriff/Sheriff Ford County, Kansas; Marshal, Trinidad, Colorado; U. S. Deputy Marshal, Dodge City, Kansas; Peace Commissioner/Deputy U.S. Marshal, Southern District of New York
- Dave Mather (1851 – c. 1886), Marshal, Dodge City, Kansas; Assistant Marshal, El Paso, Texas; U. S. Deputy Marshal New Mexico Territory; R. C. M. P.
- Mike Meagher (1844–1881), Marshal, Wichita, Kansas
- Jeff Milton (November 7, 1861 – May 7, 1947) Texas Ranger; El Paso, Texas Police Chief
- Burton C. Mossman (1867–1956), Captain, Arizona Rangers
- Harry N. Morse (1835–1912), Sheriff, Alameda County, California
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- George Scarborough (1859–1903)
- John Selman (1839–1896), El Paso, Texas Constable
- Sam Sixkiller (1842–1886), Captain, U.S. Indian Police, Indian Territory; Deputy U.S. Marshal, Indian Territory
- Charles Sims (1879–1945), Town Marshal Rosedale, Oklahoma
- John Slaughter (1841–1922), Sheriff and Texas Ranger, Cochise County, Arizona, Arizona Territory
- Thomas Smith (1830–1870), Marshal and Deputy U.S. Marshal, Kit Carson, Colorado and Abilene, Kansas
- Con Stapleton (1848–1879), Marshal, Deadwood, South Dakota
- Dallas Stoudenmire (1845–1882), El Paso, Texas Marshal and Texas Ranger; Deputy U.S. Marshal
- Michael Sughrue (1844–1901), Sheriff, Clark County, Kansas; Marshal Ashland, Kansas; Deputy Sheriff, Ford County, Kansas; Deputy Marshal, Dodge City, Kansas
- Henry Andrew "Heck" Thomas (1850–1912), Deputy U.S. Marshal, Oklahoma Territory.
- Ben Thompson (1842–1884), Marshal, Austin, Texas
- Bill Tilghman (1854–1924), Deputy Marshal, Dodge City, Kansas; Deputy U.S. Marshal, Oklahoma Territory; Sheriff, Lincoln County, Oklahoma; Chief of Police, Oklahoma City, Oklahoma
- Paden Tolbert (1863–1904), Deputy U.S. Marshal, Indian Territory.
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