Iowa Code § 48A.7: Registration in person.

An eligible elector may register to vote by appearing personally and completing a voter registration form at the office of the commissioner in the county in which the person resides, at a motor vehicle driver’s license station, including any county treasurer’s office that is participating in county issuance of driver’s licenses under chapter 321M, or at any voter registration agency. A separate registration form shall be signed by each individual registrant.