Gem County is a county in the state of Idaho. Based on the 2010 census, the
population was 16,719. Gem County was created
on March 15, 1915. The county seat and largest city is
Emmett. The county is named for the State nickname of
"Gem State."
Gem County is part of the Boise, ID Metropolitan Statistical Area.
Gem County is named for the Idaho state nickname of Gem State.
County QuickFacts: CensusBureau Quick Facts
Established March 15, 1915 with its county seat at Emmett. Named for the state nickname, "Gem State." Fur trappers were in the area as early as 1818 and Alexander Ross explored Squaw Creek in 1824. Prospectors and miners moved through the county in 1862 in route to the gold rush in the Boise Basin, and by the next year irrigation began along the Payette River.
As reported by the Census Bureau, the county has a total area of 566 square miles (1,470 km2), of which 561 square miles (1,450 km2) is land and 4.8 square miles (12 km2) (0.8%) is water.
Gem county is located close to the center of Idaho. The county is the fifth-smallest county in Idaho by area.
Bordering counties are as follows: