| Name, Place, or Title |
Born |
Died |
Noted |
| A Code of Indian Offenses (1883) | | | 08 |
| A Connecticut Yankee in King Arthur’s Court (M) 1931 | - | - | 07 |
| A Fistful of Dollars (M) 1964 | - | - | 18 |
| A Good Day to Die (Novel) 1967 | | | 31 |
| A Half Century of Conflict (Book) ???? | - | - | 45 |
| A Lonely Ride (Short Story) | | | 18 |
| A Texas Cowboy (B, Charlie Siringo) | | | 42 |
| A Touch of Sun and Other Stories (Book) 1903 | | | 26 |
| A Vaquero of the Brush Country (1929) | | | 38 |
| A Victorian Gentlewoman in the Far West (Book) 1972 | - | - | 26 |
| A Year of American Travel | | | 52 |
| ABC Television | | | 37 |
| Abert, J. W. (Lt. U.S. Army) c. 1840's | | | 34 |
| Abert, John James (Soldier | | | 04 |
| Abilene, KS (RR, Cattle) | | | 15, 23, 36, 50 |
| Abolitionist (anti-slavery activist) | | | 17, 19, 30, 42, 48 |
| Academy of Country Music | | | 27 |
| Academy of Country Music, The | | | 27 |
| Acord, Artemus Ward "Art" (Pioneer Western Movie Star) | 11 | 1 | 01, 11 |
| Across the Wide Missouri (1951) | | | 49 |
| Adamson, Carl (Witness) | | | 09 |
| Adams, Andy (Western Author) | 18 | 39 | 18, 39 |
| Adams, Gen. Charles (Colorado Militia) | | | 42 |
| Adams, Jake (Drunk Cowhand) | | | 27 |
| Adams, James [Capen] "Grizzly" (Mountain Man) | 1812 | 1860 | 03, 43 |
| Adams, Ansel (Painter) | - | - | 0 |
| Adkin, George (saloon owner, DC) | - | - | 33 |
| Adobe Walls, 1st Battle of (TX) | - | - | 48 |
| Adobe Walls, 2nd Battle of (TX) | - | - | 26, 27 |
| Adventures of Champion (Radio series, Mutual) 1949 to 1950 | - | - | 0 |
| Adventures of Champion (TV) 1955-56) | 38 | 9 | 09, 38 |
| Adventures of Huckleberry Finn (Book) 1885 | - | - | 07, 16 |
| Adventures of Jim Bowie (TV) ???? | - | - | 0 |
| Adventures of Kit Carson (TV) ???? | - | 11 | 11 |
| Adventures of Red Ryder (Movie Serial) 1940 | | | 11 |
| Adventures of Wild Bill Hickok (Radio) ???? | - | - | 07 |
| Adventures of Wild Bill Hickok (TV, 1951-53) | | | 07, 31 |
| Ah Quong Tai (Murder with a twist) | - | 23 | 23 |
| Aiken Massacre (1857) Utah | - | - | 29, 0 |
| Ainsworth, Billy | - | - | 02 |
| Alamo 1960 (M) | - | - | 02, 50 |
| Alamo, Battle of the (TX Independence) | - | - | 09, 10 |
| Alamo, The (M - 2004) | | | 19 |
| Albershart, Harry Leonard (see: Rocky Lane) | | | 0 |
| Aldrich, ?? (Bad Choice for Badmen) | | | 36 |
| Alfee, Alfred (Texas Ranger) | - | - | 39 |
| Alford, C.A. (Iron Mountain RR Conductor) | | | 05 |
| Allemand, Joe (Sheepman, Victim) | - | 14 | 14 |
| Allen, E.H. (Deputy) (T) | - | - | 13 |
| Allen, Rex Elvie (Songwriter/Singer, Recording, Movie and TV Star) | 52 | 51 | 09, 11, 39, 51, 52 |
| Allen, Rex Jr. (Country/Western Singer) | - | - | 22, 51 |
| Allen, William J. ‘Billy’ (T, Leadville, CO) | - | - | 33 |
| Allison, John | - | - | 51 |
| Allison, Robert A. "Clay" | 1840 | 26 | 26, 40, 44, 45, 51 |
| Allison, Roe (Lawman) | - | - | 18 |
| Along the Great Divide (M) 1951 | - | - | 50 |
| Along the Navajo Trail (M) 1945 | - | - | 27 |
| Alonzo, Harry (see: Sundance Kid, The) | | | 0 |
| Alope (1st. wife of Goyahkla) Geronimo | | | 10 |
| Alta California | 1821 | 1850 | 05 |
| Alton & St. Louis RR (c. 1870's) | | | 40 |
| Alvord, Burt (Outlaw, Lawman) | - | 1910? | 07, 23, 45 |
| American Express Company | - | - | 12, 31 |
| American Fur Company, The | | | 26 |
| American Historical Association | - | - | 28 |
| American Horse (Minneconjou Chief) | | | 37 |
| American Indians | | | 40, 51 |
| American Moses, The | | | 35 |
| Anderson William “Bloody Bill" (Confederate Partisan) | - | 43 | 39, 43, 50 |
| Anderson's Raiders | - | - | 39, 43 |
| Andersonville, GA (Camp Sumpter Confederate Prison) | - | - | 09, 45 |
| Anderson, D.L. (see: Billy Wilson) | | | 0 |
| Anderson, Gilbert M. “Broncho Billy” (Max Aronson) | 12 | 3 | 03, 12, 18 |
| Anderson, Hugh | - | - | 27, 34 |
| Anderson, Rufus B. (unfortunate killer) | | | 44 |
| Anderson, William (Victim) | | | 23, 43 |
| Anderson, Wilson (Killer & Victim) | - | 41 | 13, 41 |
| Anderson, Charles | | 50 | 50 |
| Andrews | | | 49 |
| Andrews, “Arkansas” Slim (Movie Actor) | - | - | 45 |
| Angel and the Bad Man (M) 1947 | - | - | 09 |
| Angle of Repose (Book) 1971 | - | - | 26 |
| Annie Oakley (Sharpshooter Extraordinaire) [born: Phoebe Ann Mosey] | 33 | 44 | 33, 44, 47 |
| Antrim, Henry (William) (Kid Antrim) {see: Billy the Kid} | | | 51, 0 |
| Apache (M) 1954 | - | - | 35 |
| Apache Hank (see: Swilling, Hank) | | | 0 |
| Apache Indians | | | 14, 16, 20, 23, 25, 28 |
| Apache Indians (Chiricahua) | | | 03, 07, 18, 36 |
| Apache, Jicarilla | | | 52 |
| Appaloosa (M) 2008 | | | 40 |
| Arapaho Indians | | | 07, 14, 26, 36 |
| Arapeen, Jake (Ute Chief) | | | 15 |
| Arbuckle, Mortimer (Victim) | | | 10 |
| Archer, Sam | - | 28 | 28 |
| Archie Peyton (bombing victim) half brother to Jesse & Frank James | | | 04 |
| Arch, Wolf | - | - | 44 |
| Arizona Bushwhackers (Movie) 1968 | | | 20 |
| Arizona Citizen (1870) | | | 42 |
| Arizona Cowboy, The | | | 51 |
| Arizona Pioneer's Home (Prescott, AZ) | | | 44 |
| Arizona Raiders (Movie) 1965 | | | 11 |
| Arizona Rangers | | | 07, 18 |
| Arizona Territorial Prison | | | 28 |
| Arizona Whirlwind (M) 1944 | - | - | 12 |
| Arizona, State of (48th State) "The Grand Canyon State" | 1912/7 | - | 07, 08 |
| Arizona, Territory of | 1863/8 | 1912/7 | 20, 22, 27, 31, 36 |
| Arkansas Toothpick (see: Weapons Photos) | | | 0 |
| Arkansas, State of (15th State) "The Natural State" | 1826/24 | - | 24 |
| Armijo, Manual | | | 02 |
| Armstrong, John Barclay (Texas Ranger) | | | 01, 18, 34, 40, 49 |
| Armstrong, Lew (Sheriff) | | | 20 |
| Armstrong, R.G. (Movie Actor) | | | 0 |
| Arness, James (James Aurness) (TV Star) | 21 | - | 21, 37 |
| Aronson, Max (see: “Broncho Billy” Anderson) | | | 0 |
| Around the World in Eighty Days (Novel) 1873 | | | 01, 04 |
| Arrow in the Dust (M) 1954 | | | 38 |
| Arrowhead (M) 1953 | | | 25, 45 |
| Arthur, Chester A. (21st. U.S. President) | | | 38 |
| Askew, Daniel (murder victim) | | | 15 |
| Atchinson Topeka and Santa Fe RR (see: Santa Fe RR) | | | 15, 19, 22, 27, 46 |
| Aten, Ira (Texas Ranger, Rancher) | 36 | 31 | 31, 36, 52 |
| Ates, Roscoe "Soapy" (Movie Actor, Sidekick) | | | 09, 27, 38 |
| Atherton, Gertrude (Franklin, Horn) Writer, Novelist, Feminist | 44 | 24 | 24, 44 |
| Atlantic and Pacific RR | 1867 | 1897 | 37 |
| Aubry, Francis Xavier | | | 33, 0 |
| Auguste, Lucienne (interpeter) | | | 33 |
| Auraria, CO | | | 05 |
| Austin, Charles "Champagne" (Saloon Owner, Dallas, TX) | - | - | 01 |
| Austin, Stephen Fuller “Father of Texas” | 44 | 52 | 44, 52 |
| Austin, TX | | | 20 |
| Author) | | | 34 |
| Autry, Orvon Gene (see: Gene Autry) | | | 0 |
| Averell, Jim (Homesteader, Victim) | - | 29 | 14, 29 |
| Ayers, J.B (Wells Fargo Secret Agent) | | | 13 |
