Here ya go, page 6: https://cdn1.sportngin.com/attachments/document/2210-1687681/2018-19_Final_Registration_Report.pdf#_ga=2.245555780.1107125706.1576789290-1896761470.1576789290
Minnesota has 58,000.
North Dakota has 6,700. Most are on the younger end (12 and under)
Utah has 4,700. It's the whole Rocky Mountain Region that has ~54,000, which includes 15,000 in TX and 15,000 in CO.