A
- John Hicks Adams (1830–1878), Sheriff, Santa Clara County, California, Deputy U.S. Marshal, Arizona Territory
- Alfred Shea Addis, Territorial Marshal, Tucson, Arizona 1883-1886
- William "Red" Angus (1849–1922), Sheriff, Johnson County, Wyoming
- Ira Aten (1862–1953), Sheriff and Texas Ranger, Castro County, Texas
B
- Elfego Baca (1865–1945), New Mexico
- P.C. Baird (died 1928), Sheriff and Texas Ranger, Mason County, Texas
- Mariano Barela, Sheriff and U.S. Marshal, Mesilla, New Mexico
- Joel Almon Bascom (1832–1912), Chief of Police, Provo, Utah and constable of Mona, Utah
- John Watson Bell Bascom (1869–1948), Deputy Sheriff, Uintah County, Utah and constable of Naples, Utah
- Charlie Bassett (1847–1896), Sheriff of Ford County, Kansas, Marshal of Dodge City
- Johnny Behan (c. 1845–1912), Sheriff, Cochise County, Arizona Territory
- Horace Bell (1830-1918), Los Angeles Ranger
- James W. Bell (died 1881), Deputy Sheriff, Lincoln County, New Mexico
- Sam Bernard (1880–1964), Deputy Lincoln County, New Mexico, Hillsboro, New Mexico
- 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
- Henry Newton Brown (1857–1884), Marshal, Tascosa, Texas (ghost town) and Caldwell, Kansas
- Neal Brown (born 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
C
- 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
- James W. Carr (1845-1926), Marshal Silverton, Colorado; Marshal Rico, Colorado; Deputy Sheriff Ouray County, Colorado; Deputy Sheriff Dolores County, Colorado
- 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
- Gary Cook NBC Tactical Response, RSO SO Presidential Advisor SWR
- George Washington Cook Sheriff Sierra County NM
- Robert Everett Cook, Warden New Mexico Penitentiary Pruitt NM
- Robert William Cook Shore Patrol USN 1945 San Francisco CA; Deputy Sheriff Sierra County NM; New Mexico State Police; Chief of Police, Grants NM
- "Longhair" Jim Courtright (1848–1887), Omaha, Nebraska Marshal, Marshal, Lake Valley, New Mexico; Sheriff, Fort Worth, Texas; Detective, Fort Worth, Texas
D
- Frank Dalton (1859–1887), Deputy US Marshal, Fort Smith, Arkansas, Oklahoma Territory
- Ben Daniels (1852-1923), US Marshal, Pima County, Arizona sheriff, superintendent of Yuma Territorial Prison
- James "Jim" M. Dodson (1876-1890), Prescott, Arizona City Marshal; Arizona State Penitentiary Wall Guard (post retirement)
- Ed Drew (1865-1911), Pinal County, Arizona deputy sheriff
E
- 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 U.S. Marshal, Prescott, Arizona; Deputy U.S. Marshal, Tombstone, Arizona; Marshal/Chief of Police, Tombstone, Arizona; 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; Deputy U.S. Marshal, Arizona Territory
F
G
H
- Lee Hall (1849–1911), Texas Ranger
- Wiley G. Haines (1860–1928), Undersheriff, County P, Oklahoma Territory; Deputy U.S. Marshal, Oklahoma Territory; Chief, Osage Indian Police
- John Coffee Hays (1817–1883), "Captain Jack", Captain in the Texas Rangers; first Sheriff of San Francisco (1850)
- 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 (1855–1947), 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.
J
K
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L
- 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
- Steve "Big Steve" Long (unk–1868), outlaw and Deputy Marshal, Laramie, Wyoming Territory
- Harry Love (1809–1868), Captain, California State Rangers (1853–1855)
M
- Chris Madsen (1851–1944), U.S. Marshal, Oklahoma Territory
- 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
- Ed Masterson (1852–1878), Marshal, Dodge City, Kansas
- James Masterson (1855–1895), Dodge City, Kansas, Ford County, Kansas, Ingalls, Kansas, Deputy U.S. Marshal
- Andrew "Andy" Mather (1851-1929), Texas Ranger, Williamson County, Texas, Co. E, Frontier Battalion, under Captain Maltby
- Joseph McNulty (1841-1909), Sheriff, Rooks County, Kansas
- Tolbert "Tol" Fannin McKinney (1857-1938), Lt. Texas Ranger, Co. D & E.; Frontier Battalion under Captains John R. Hughes & John H Rogers; Deputy Sheriff in Uvalde, Zavala, Bandera, Brewster, and El Paso Counties, Texas
- Leander H. McNelly (1844–1877), Texas Ranger
N
- David Neagle (1847–1926), Deputy Sheriff, Cochise County, Arizona Territory; Marshal, Tombstone, Arizona Territory; Detective, US Marshal, San Francisco, California
- Evett Dumas Nix (1861-1946), US Marshal, Fort Smith, Arkansas, Nasty Nate, Kansas
O
P
R
- Alexander Ramsey (Old West lawman) (1847-1875), Marshall, Hays City, Kansas, later, Sheriff, Ellis County, Kansas, shot and captured Henry Born "Dutch Henry", shot and killed nine other outlaws in discharge of his duties
- Bass Reeves (1832–1910), Deputy U.S. Marshal, Indian Territory
- Porter Rockwell (1813–1878), Utah Territory
S
- George Scarborough (1859–1903), El Paso, Texas Sheriff, killed John Selman
- John Selman (1839–1896), El Paso, Texas Constable, killed John Wesley Hardin
- Charles Sims (1879–1945), Town Marshal Rosedale, Oklahoma
- Charlie Siringo (1855-1928), Pinkerton detective
- Sam Sixkiller (1842–1886), Captain, U.S. Indian Police, Indian Territory; Deputy U.S. Marshal, Indian Territory
- John Slaughter (1841–1922), Sheriff and Texas Ranger, Cochise County, Arizona, Arizona Territory
- Lot Smith (1830-1892), Sheriff Davis County, Utah; in March 1853, Farmington, then known as Little Cottonwood, was approved by Utah Territorial Legislature as the County seat of Davis County; a year later, Lot Smith, who also served in Mormon Battalion at age 16, was appointed county's first sheriff
- 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
T
- 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
- James Timberlake (1846-1891), Deputy Marshal, Liberty, Missouri; County Sheriff, Clay County, Missouri; Constable, Liberty, Missouri
- Paden Tolbert (1863–1904), Deputy U.S. Marshal, Indian Territory
U
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V
W
- John Joshua Webb (1847–1882), Deputy Marshal, Dodge City, Kansas; Marshal, Las Vegas, New Mexico
- Franklin Pierce West, Indian Territory Deputy Marshal
- Fred White (1849–1880), Marshal Tombstone, Arizona Territory; died in the line of duty
- Robert Widdowfield (1846-1878), Wyoming Deputy sheriff, first Wyoming officer to be killed in the line of duty
- William Fletcher Wheeler (1824-1894), Montana Territory U.S. Marshal 1869-1878, Lt Col, 1st MN Vol Inf, 1858–61, Capt, Co F, 4th MN Inf, 1861-64 (WIA at Vicksburg, Mississippi), 3rd U.S. Marshal in the Montana Territory, 1869–78; founder of Montana Historical Society
X
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Y
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Z
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