The Missouri Secretary of State now has a statewide Voter Information Lookup online. Enter the person’s first and last name, county and street name. If you’ve correctly matched that personal information, you have to select the correct street address, as you can see in this image.
Then you’ll get a confirmation that the person is registered to vote.
If you can rely on current voter registration status to verify where someone lives, then this could be useful.
Have you found that the voter registration lookup sites return valuable information?