Jefferson County, Missouri
Jefferson County is a county in Missouri with an estimated population of 231,230 in 2023. 10 cities, towns and Census places in it are indexed here.
Largest places in Jefferson County
Arnold 21,059Festus 13,443De Soto 6,493Pevely 6,064Herculaneum 5,245Crystal City 4,717Hillsboro 3,502Byrnes Mill 3,185Olympian Village 715Lake Tekakwitha 235
About Jefferson County
Jefferson County is one of the counties of Missouri. County governments in Missouri 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.