Idaho’s population growth has been growing fast – so quickly that the state had the No. 1 growth rate in the nation at 21.5 % from 2012-2022, according to the U.S. Census Bureau.
Close to 90% of the state’s population growth stems from rapid net domestic migration into Idaho and not from Idaho residents suddenly deciding to have lots of babies. Idaho’s birth rate of 11.8 births per 1,000 population in 2021 (12th highest in the nation) was a 29% decline compared with 16.6 in 2007, fourth highest in the nation at the time). The rate remains higher than most of Idaho’s bordering neighbors, such as Oregon at 9.6 (fourth lowest), Montana at 10.2 and Washington at 10.8. Nationwide, birth rates per 1,000 population have decreased 23%, from 14.3 in 2007 to 11.0 in 2021 .
Migration is contributing to a higher number of school-age students in Idaho today than expected based on Idaho births alone but is still unable to reverse the trend that Americans in general are having significantly fewer babies than in the past.