“Amarilloan” is the name of an inhabitant of Amarillo, Texas. The name “Amarilloan” has been cited in print since at least 1907.
 
 
Wikipedia: Amarillo, Texas
Amarillo (English pronunciation: /æməˈrɪlɵ/) is the 14th-largest city, by population, in the state of Texas, the largest in the Texas Panhandle, and the seat of Potter County. A portion of the city extends into Randall County. The population was 190,695 at the 2010 census. The Amarillo metropolitan area has an estimated population of 236,113 in four counties.
 
Amarillo, originally named Oneida, is situated in the Llano Estacado region. The availability of the railroad and freight service provided by the Fort Worth and Denver City Railroad contributed to the city’s growth as a cattle marketing center in the late 19th century. Amarillo is the regional economic center for the Texas Panhandle, and is economically important to Eastern New Mexico and the Oklahoma Panhandle.
 
The city was once the self-proclaimed “Helium Capital of the World” for having one of the country’s most productive helium fields. The city is also known as “The Yellow Rose of Texas” (as the city takes its name from the Spanish word for yellow), and most recently “Rotor City, USA” for its V-22 Osprey hybrid aircraft assembly plant. Amarillo operates one of the largest meat packing areas in the United States. Pantex, the only nuclear weapons assembly and disassembly facility in the country, is also a major employer. The attractions Cadillac Ranch and Big Texan Steak Ranch were located adjacent to Interstate 40. U.S. Highway 66 also passed through the city.
 
Free Merriam-Webster Dictionary
Am·a·ril·lo geographical name \ˌa-mə-ˈri-(ˌ)lō, -lə\
Definition of AMARILLO
city NW Texas pop 173,627
— Am·a·ril·lo·an \-ˈri-lō-ən\ noun
 
29 October 1907, Fort Worth (TX) Telegram, “Hub of Panhandle,” pg. 8, col. 2:
Amarillo has been growing like Fort Worth the last few years, and Amarilloans have been too busy to waste time in useless talk. They have learned to say the most in the shortest time. The average Amarilloan can tell you all about his town and the surrounding country in about two seconds.
 
3 July 1910, Galveston (TX) Daily News, pg. 20, col. 5:
Amarillo Panhandle: That ziz-zag walk which threatens to become habitual with the amiable Amarilloan is attributable to the fact that the streets are obstructed by building material to such an extent as to make bee-line progress impossible.
 
29 December 1915, The Gazette (Stevens Point, WI), “Still Climbing Up,” pg. 1, col. 3:
“A great surprise overtook most Amarilloans on or about the 1st of November, when word was passed that D. Van Hecke, our superintendent, was to leave us, and you can take it from me that it did not set well at first, but, like all new things, it finally did wear down to a nice smooth bearing.”
 
6 May 1916, Galveston (TX) Daily News, “Join In,” pg. 4, col. 4:
Did anybody ever hear of an Amarilloan failing to join in when his town was being talked up? Why man, the Amarilloans lead the conversation.
 
The Portal to Texas History
28 August 1919, Canadian (TX) Record, pg. 5, cols. 1-2:
Amarilloans deeply regret the loss of these trees, pride in which had become general throughout the city and county.—Amarillo Daily News.
 
Amarillo (TX) Globe-News
Amarilloans call for prayer at community breakfast
Posted: November 19, 2011 - 9:08pm
By RUSSELL ANGLIN
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Theologian and cultural apologist James Denison will be the featured speaker at the annual Community Prayer Breakfast scheduled Tuesday at the Amarillo Civic Center.