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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 ).
ZIP code: 63049. Area code: 636: FIPS code: ... High Ridge is an unincorporated community and census-designated place (CDP) in Jefferson County, Missouri, United ...
Eureka is a city mainly in St. Louis County, with a small portion in Jefferson County, Missouri, adjacent to Wildwood and Pacific. It is in the extreme southwest of the Greater St. Louis metro area. As of the 2020 census, the city had a population of 11,646. [5] Since 1971, Eureka has been known as the home of the amusement park Six Flags St ...
ZIP code: 63012. Area code: 636: FIPS code: 29-03394 [3] GNIS feature ID: 2393328 [2] Barnhart is a census-designated place (CDP) in Jefferson County, Missouri ...
ZIP Code: 63026. FIPS code: 29-50834 [3] GNIS feature ID: 2393142 [2] Murphy is a census-designated place (CDP) in Jefferson County, Missouri, United States.
Map of the United States with Missouri highlighted. ... County 2020 Census Pop. 2021 Pop. Est. Main Zip Code Affton: St. Louis: 20417: 18925:
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.