Here is a list of Arkansas cities that have had professional baseball teams playing in organized leagues. An asterisk means that the city still has a professional team.
North Little Rock*
This listing awards joint ownership of the Arkansas Travelers to Little Rock and North Little Rock. The team was known as the Little Rock Travelers for its first half-century of existence, before the name was changed to Arkansas Travelers. Most people still think of the Travelers as a Little Rock team, but the new stadium is actually across the Arkansas River in North Little Rock. The team that played in Argenta (an old name for North Little Rock) was a different team, long defunct. Springdale will join the list next year.
Source: “Bush League” by Robert Obojski