Idaho is a state in the northwestern region of the United States. Idaho is the 14th largest, the 39th most populous, and the 7th least densely populated of the 50 United States. The state's largest city and capital is Boise. Residents are called "Idahoans". Idaho was admitted to the Union on July 3, 1890, as the 43 rd state.
Idaho is a mountainous state with an area larger than that of all of New England. It borders the Canadian province of British Columbia to the north, Montana to the northeast, Wyoming to the east, Nevada and Utah to the south, and Washington and Oregon to the west. The network of dams and locks on the Columbia River and Snake River make the city of Lewiston the farthest inland seaport on the Pacific coast of the contiguous United States.