CARTHAGE, Mo. (AP) — Jasper County residents say thousands of people who moved after a tornado hit the county last year may have trouble voting because of confusion over their new addresses.

The county clerk’s office says about 10,000 voter registration cards have been returned.

That’s because the addresses are no longer valid.

Clerk Bonnie Earl said Monday many of the returned cards were for residents in Joplin and Duquesne who have not notified election officials that they moved after the May 2011 tornado.

Earl says she’s concerned voters might not know where they need to vote in the upcoming elections. Earl said she expects that some voters who have moved and not notified election officials may choose to vote at their previous polling place.