The alphamegalog of the cities of Arkansas lists the largest city in Arkansas for each letter of the alphabet. In this case, ‘largest’ is based on population within the city proper.

Arkadelphia
Bentonville
Conway
De Queen
El Dorado
Fort Smith
Greenwood
Hot Springs
Imboden
Jonesboro
Kensett
Little Rock
Maumelle
North Little Rock
Osceola
Pine Bluff
Quitman
Rogers
Springdale
Texarkana
Ulm
Van Buren
West Memphis
(no X)
Yellville
Zinc