The Iowa Department of Transportation offers applications and testing for new and renewing driver's licenses at the IDOT office located at:
316 S 2nd Street
Clinton, IA 52732
The phone number is 563-243-7144. Normal hours of operation: Tuesday through Friday, 8:30 am to 5 pm and Saturday, 8 am to 1 pm. You may renew your driver's license 40 days before or 60 days after expiration.