Jefferson County, Idaho

Jefferson County is a county in Idaho with an estimated population of 34,198 in 2023. 6 cities, towns and Census places in it are indexed here.

Largest places in Jefferson County

About Jefferson County

Jefferson County is one of the counties of Idaho. County governments in Idaho handle local services such as courts, property records and elections; cities and towns inside the county run their own municipal services. Population figures come from the Census Bureau's Vintage 2023 estimates, which are updated annually.