I'd say it's growing here in KC. No accurate numbers but I'm seeing a few more riders every year. The area as a whole has been working on more friendly bike structure, bike lanes etc. The hills tend scare some way, no way around that.
In my RV travels I've seen quite a few cities adding bike lanes and discussing it. Madison, Twin Cities, Winnipeg, ALL of Colorado.. don't recall anything in Atlanta.. for some reason I want to say the Northern states are progressing more than the Southern states. Am I wrong on this?