The two counties at the heart of the Treasure Valley accounted for 50 percent of the state’s population growth last year.
Of the 30,312 people added to the state’s population between July 1, 2015, and June 30, 2016, Ada and Canyon counties added 10,561 and 4,612, respectively, according to the latest population estimates from the U.S. Census Bureau. Ada grew 2.4 percent, Canyon grew 2.2 percent.
Idaho’s population grew 1.8 percent to 1.68 million,
Only three Idaho counties besides Ada and Canyon grew by more than 1,000 people: Bonneville, Kootenai and Twin Falls. Those five urban counties and Bannock County made up 77 percent of the state’s growth and 65 percent of its overall population.
Nearly half of Idaho’s 44 counties grew by less than 1 percent, reflecting a continued population shift from the state’s rural to urban counties. Six counties posted a population decrease.
Clark County, home to just 860 people, posted the largest percentage decrease, 1.4 percent, or 12 people. Idaho County, home to 16,156 people, had the largest numerical decrease, 104 people or 0.6 percent.
According to Census estimates, two of Idaho’s metropolitan areas ranked in country’ top 25 fastest growing: Coeur d’Alene ranked 11th with a 2.6 percent increase, and Boise ranked 19th with a 2.3 percent increase.