There were just under 3,664,300 births recorded in the United States in 2021.  The five-state Rocky Mountain region recorded 149,556 births in 2021 or about 4.1% of the national total.  With 11.74 births per 1,000 population, the Rocky Mountain region's birth rate was 6.4% above the national average birth rate.  Only the Southwestern region of the U.S. had a higher regional birth rate than the Rocky Mountain region in 2021.  A closer inspection of data from the National Center for Health Statistics details the following about birth rates in the Rocky Mountain region:

Birth Rates in the Rocky Mountain Region

State	Births	Population	Birth Rate*
Colorado	62,949	5,812,069	10.83
Idaho	22,427	1,900,923	11.80
Montana	11,231	1,104,271	10.17
Utah	46,712	3,337,975	13.99
Wyoming	6,237	578,803	10.78
Region	149,556	12,734,041	11.74
U.S. Totals	3,664,292	331,893,745	11.04

(*) number of births per 1,000 population

Report Period: 2021

Source: CDC Wonder. Centers for Disease Control and Prevention, National Center for Health Statistics. National Vital Statistics System, Natality on CDC WONDER Online Database. Data are from the Natality Records 2016-2021, as compiled from data provided by the 57 vital statistics jurisdictions through the Vital Statistics Cooperative Program. Accessed on July 1, 2023