Voter registration for the Castlewood city election will close at 5 p.m. Registration may be completed during regular business hours at the county auditor’s office, municipal finance office, secretary of state’s office, and locations that provide driver’s licenses, SNAP, TANF, WIC, military recruitment and assistance to the disabled. You can check to see if you are registered to vote or request a mail-in registration form by contacting the county auditor or online at sdsos.gov.