Gem County, Idaho County, Idaho were: Gem County, Idaho Gem County is a county in the U.S. state of Idaho. As of the 2010 census, the population was 16,719. The county seat and largest city is Emmett. Gem County is part of the Boise, ID Metropolitan Statistical Area. Gem County is home to the Idaho ground squirrel. Named for the state nickname, "Gem State," the county was established on March 15, 1915, partitioned from Canyon County and Boise County. Fur trappers were in the area as early as 1818, and Alexander Ross explored Squaw Creek in 1824. Prospectors and miners moved through the
State highways deleted by the Utah State Legislature in 1969 which was subsequently renumbered to SR-26 as part of the 1977 Utah state route renumbering in order to avoid confusion with US-50. State Route 53 connected SR-8 (now US-6/US-191) at Wellington with SR-6 (now US-40) west of Myton via Nine Mile Canyon Road. The road was taken over on January 10, 1916, and immediately reused to replace part of SR-37 in Ogden after its 1969 deletion. State Route 54 was created as a renumbering of a branch of SR-12 to Tropic. That same year, a new State Route 120 was created, continuing the road from Tropic to Henrieville, and in