Hot Springs County Treasurer – Vehicle Registration 415 Arapahoe St.Thermopolis Wyoming 82443 WY Hot Springs 415 Arapahoe St.Directions (307) 864-3616 Monday 08:00 am - 05:00 pm Tuesday 08:00 am - 05:00 pm Wednesday 08:00 am - 05:00 pm Thursday 08:00 am - 05:00 pm Friday 08:00 am - 05:00 pm Saturday Closed Sunday Closed