Idaho is divided into 44 counties, each serving as a local government unit. These counties vary in size, population, and geography, with Ada County being the most populous, home to the state capital, Boise. Other notable counties include Kootenai County, known for its lakes, and Bannock County, which features the city of Pocatello. Counties in Idaho are responsible for various services, including law enforcement, road maintenance, and public health. Each county has an elected board of commissioners that oversees local governance. The diverse landscapes of Idaho's counties range from mountains to plains, contributing to the state's natural beauty.