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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.
The average population of Missouri's counties is 53,880; St. Louis County is the most populous (987,059), and Worth County is the least (1,907). The average land area is 599 sq mi (1,550 km 2 ). The largest county is Texas County (1,179 sq mi, 3,054 km 2 ) and the smallest is St. Louis city (61.9 sq mi, 160 km 2 ).
Location of Jefferson County in Missouri. This is a list of the National Register of Historic Places listings in Jefferson County, Missouri. This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Jefferson County, Missouri, United States. Latitude and longitude coordinates are ...
Olympian Village is a city in Jefferson County, Missouri, United States.The population was 774 at the 2010 census.The city was named in honor of Greek myth and culture. Some street names include Parthenon Drive, Kronos Drive, Hercules Place, Plato Place, and Pheidippides Pl
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 ]
Arnold has a public library, a branch of the Jefferson County Library. [36] The Jefferson College (Missouri) Arnold campus was opened in 2007 to expand educational services to those in northern Jefferson County. The 40,000 square feet (3,700 m2) facility is located at 1687 Missouri State Road behind the Arnold Library and Recreation Center.
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 ]
The government of the U.S. state of Missouri is organized into the state government and local government, including county government, and city and municipal government. While the state was originally a part of the Democratic-dominated "Solid South," the state transitioned into a national bellwether at the start of the 20th century.