Site Navigation Arizona Colorado Idaho Montana Nevada New Mexico Utah Wyoming     Idaho Gateway @ RockyMountainRoads Sitemap to all pages covering the state of Idaho. Unless otherwise noted, all photographs taken by Alex Nitzman and Andy Field. Population Statistics State Population 1,466,465 Top County Populations Ada 359,035 Canyon 173,302 Kootenai 131,507 Bonneville 94,630 Cache 91,391 Washington 90,354 Top City Populations Boise 190,117 Bannock 78,443 Twin Falls 71,575 Idaho Falls 51,507 Meridian 41,127 Coeur d'Alene 37,262 Twin Falls 36,742 Caldwell 31,041 Lewiston 30,937 Source: 2006, 2003 U.S. Census Data Estimates Other Statistics Capital: Boise Nickname: Gem State Area: 82,751 square miles Statehood: 43rd state; admitted July 3, 1890 Total Interstate Mileage: 611.76 miles Highest Point: Borah Peak, 12,662 feet Highway Guides Interstate 184 Boise Road Photos Page Updated June 5, 2008.