There were just over 3,613,600 births recorded in the United States in 2020.  The five-state Rocky Mountain region recorded 145,648 births in 2020, or about 4.0% of the national total.  With 11.61 births per 1,000 population, the Rocky Mountain region's birth rate was 5.8% above the national average birth rate.  Only the Southwestern region of the U.S. had a higher regional birth rate than did the Rocky Mountain region.  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	61,494	5,807,719	10.59
Idaho	21,533	1,826,913	11.79
Montana	10,791	1,080,577	9.99
Utah	45,702	3,249,879	14.06
Wyoming	6,128	582,328	10.52
Region	145,648	12,547,416	11.61
U.S. Totals	3,613,647	329,484,123	10.97

(*) number of births per 1,000 population

Report Period: 2020

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 2016-2020, as compiled from data provided by the 57 vital statistics jurisdictions through the Vital Statistics Cooperative Program. Accessed on August 13, 2022