Missouri Ozarks Scale Specialists meets in Branson, MO. They sometimes have their meetings in Nixa, Ozark or Springfield.
Hobby Town also has a club that meets once a month in their store.
Four States Modelers Club is in Joplin, MO.
http://www.ipmsmoss.com/
https://www.hobbytown.com/springfield-mo/l141
https://www.facebook.com/groups/4statemodelersclub/