City Primary Election Voter Pre-Registration Deadline. The deadline to pre-register to vote for the regular city election is 5 p.m. for registrations in person (including registration at driver’s license stations or agencies) or by mail. The deadline for online registrations is 11:59 p.m. Exceptions: Mailed voter registration forms postmarked on or before the worry-free postmark date, are considered on time even if received after 5 p.m. today. After today, a person may register to vote at the auditor’s office, health care facility, or a satellite absentee voting station and vote an absentee ballot. The process is the same as for registering to vote on election day. Auditor’s office is open 8 a.m. to 5 p.m.