Below is a web page courtesy of the Missouri State Senate which can be used to lookup your elected officials, both federal and state. To lookup all of your elected officials, you must enter your ZIP+4. If you don't know your ZIP+4, just click on the Go to USPS Zip Lookup button.

Once you have the list of your elected officials, you can click on their links to get more information about them such as their office phone number and e-mail address. For State Senators and Representatives, you can also get information about what committees they serve on and what bills they have sponsored.