Campbell County Treasurer’s Office (VEHICLE REGISTRATION) 500 S. Gillette Ave. Ste. 1600Gillette Wyoming 82716 WY Campbell 500 S. Gillette Ave. Ste. 1600Directions (307) 682-7268 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