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Jefferson County is located in the eastern portion of the U.S. state of Missouri. It is a part of the St. Louis Metropolitan Area . As of the 2020 census , the population was 226,739, [ 1 ] making it the sixth-most populous county in Missouri.
In Missouri, only counties of the third and fourth classes, which are those with a total assessed valuation under $450,000,000, may have township governments, but are not required to. [ 1 ] [ 2 ] As of 2021, 20 of the 114 Missouri counties had township governments, containing 285 townships. [ 1 ]
Arnold is a city in northeastern Jefferson County, Missouri, situated near the confluence of the Meramec and Mississippi rivers. A suburb of St. Louis, the city lies within the Greater St. Louis metropolitan statistical area. The population was 20,858 at the 2020 United States census, which makes it the most populous community in the county.
The land surrounding Barnhart originally belonged to Benjamin O'Fallon, who settled here with his family in 1834.The James O'Fallon Home was built in 1860, and was purchased in 1884 by Joseph G. Marriott, a cattle rancher who introducing the first Holstein cattle to Jefferson County.
Cedar Hill is an unincorporated community and census-designated place (CDP) in northwest Jefferson County, Missouri, United States. The population was 1,721 at the 2010 census. The population was 1,721 at the 2010 census.
Hillsboro is a city in and the county seat of Jefferson County, Missouri, United States. The population was 3,473 at the 2020 census , up from 2,821 in 2010. [ 5 ]
Herculaneum is a city in Jefferson County, Missouri, and is a suburb of St. Louis. The population was 4,273 at the 2020 United States Census . The City of Herculaneum was the first county seat of Jefferson County from January 1, 1819, to 1839.
Sulphur Springs is an unincorporated community in eastern Jefferson County, Missouri, United States. [1] It is located near Barnhart, bordering the banks of Glaize Creek and the Mississippi River. Sulphur Springs was platted in 1860, and named for a sulphur spring near the original town site. [2]