Mason County Auditor (Registration & Title) 411 N 5th StShelton Washington 98584 WA Mason 411 N 5th StDirections (360) 427-9670 Monday 09:00 am - 04:00 pm Tuesday 09:00 am - 04:00 pm Wednesday 09:00 am - 04:00 pm Thursday 09:00 am - 04:00 pm Friday 09:00 am - 04:00 pm Saturday Closed Sunday Closed