Missouri can reward the climbers and boulderers who take the time to find the quality destinations. There is some pretty good info listed here, and more is always welcome. Please add as much specific information as to location, directions, height, type of protection available (not too much beta, though), difficulty and ratings, restrictions, cautions, rock quality, etc. etc., as possible.
There have been some recent additions to the Missouri section of RC.com; more routes and areas and information. "Thanks," to all the contributors! There are at least two guidebooks worth mentioning, as well: Missouri Limestone Select and Metamorphic Forms that can prove helpful to getting to Missouri climbing destinations.
Climb safely, and best wishes!
Please check with local and state authorities to make sure you are not climbing on property that is restricted for any reason!!