I believe that Clarksville did it several years ago, when the very first geocaching events started taking place in that cradle of Arkansas geocaching. More recently, about 3 years ago, I believe Morrillton did also. Perhaps some of the Johnson and Conway County geocachers can provide more information.
"Wildness is a necessity." -- John Muir
"When you go to hide a geocache, think of the reason you are bringing people to that spot. If the only reason is for the geocache, then find a better spot." – briansnat