Niobrara County Treasurer – Vehicle Registration 424 South Elm StreetLusk Wyoming 82225 WY Niobrara 424 South Elm StreetDirections (307) 334-2432 Monday 08:00 am - 04:00 pm Tuesday 08:00 am - 04:00 pm Wednesday 08:00 am - 04:00 pm Thursday 08:00 am - 04:00 pm Friday 08:00 am - 04:00 pm Saturday Closed Sunday Closed