Idaho, a mountainous state in the northwestern United States bordering British Columbia, Canada; 216,000 km2, 1.58 million population (2011), capital Boise (205,700 population; 2010). Joined the Union in 1890 as the 43rd state. Nickname: The Gem State. COUNTRYAAH.COM: Lists all counties and parishes of Idaho in alphabetical order. Covers county profile and biggest counties by […]