Idaho is a landlocked state in the Mountain West subregion of the United States. It shares a small portion of the Canada–United States border to the north, with the province of British Columbia. It borders Montana and Wyoming to the east, Nevada and Utah to the south, and Washington and Oregon to the west. The state's capital and largest city is Boise. With an area of 83,569 square miles (216,440 km²), Idaho is the 14th largest state by land area. With a population of approximately 1.8 million, it ranks as the 13th least populous and the 7th least densely populated of the 50 U.S. states.

आयडाहो हे अमेरिकेचे एक राज्य आहे. अमेरिकेच्या वायव्य भागात वसलेले व कॅनडा देशासोबत सीमा असणारे आयडाहो क्षेत्रफळाच्या दृष्टीने अमेरिकेमधील १४वे तर लोकसंख्येच्या दृष्टीने ३९व्या क्रमांकाचे राज्य आहे.