Idaho City is the capital of the state of Idaho and is home to many cities. Boise is the capital of Idaho and has five letters. Moscow is a city in northern Idaho and has six letters. Pocatello is a city in southeastern Idaho and has nine letters. Nampa is a city in southwestern Idaho and has five letters. Emmett is a city in western Idaho and has six letters. Twin Falls is a city in south-central Idaho and has nine letters.