Lyon County Driver License & Vehicle Registration 206 S. Second Ave.Rock Rapids Iowa 51246 IA USA 206 S. Second Ave.Directions (712) 472-8509 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