While Stephen still represents the 23rd District, due to redistricting he will run for re-election in the 46th District in November 2012. You can see your new legislative district on the Office of Administration's website by clicking "Find an Address" button at the top of the page (it is the red button).

Missouri's 23rd District encompasses the Northern and Western parts of Columbia. The district is entirely in Boone County. Columbia is located in Mid-Missouri and is the 5th largest city in Missouri. "CoMo" has a population of about 100,000, and is the home of the University of Missouri. You can use the map below to see if you're in the 23rd District, or you can input your zipcode here to see who represents you.
View an official map of the 23rd District