Voter registration for the Castlewood Municipal Special Referendum Election on switching to Sioux Rural Water will close on January 9th. Registration may be completed during regular business hours at the county auditor’s office, city 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 may also contact the county auditor to request a mail-in registration form or access a form at www.sd-sos.gov.