Idaho City is a town in, and the county seat of, Boise County, Idaho, United States, located about 36 miles (58 km) northeast of Boise. The population was 485 at the 2010 census, up from 458 in 2000.

Boise County is a rural mountain county in the U.S. state of Idaho. As of the 2020 United States Census, the population was 7,610. The county seat is historic Idaho City, which is connected through a series of paved and unpaved roads to Lowman, Centerville, Placerville, Pioneerville, Star Ranch, Crouch, Garden Valley, and Horseshoe Bend.