Parent County: Original
Co. Seat: Idaho City
Cities: Crouch, Garden Valley, Horseshoe Bend, Idaho City, Placerville
Established February 4, 1864 with its county seat at Idaho City. Named for the Boise River, which was named by
French-Canadian explorers and trappers for the great variety of trees growing along its banks. The Boise Basin, in
which Idaho City lies, was one of the richest gold mining districts in the nation after the discovery of gold in 1862.
At its peak in the 1860s and 1870s, Idaho City was, for a time, the largest city in the northwest; it was this great
influx of people that lead to the establishment of the Idaho Territory.
County Courthouse, Idaho City, ID 83631-0157 Phone: (208) 392-4431
IGS Publication: Winter 2000