{"id":5547,"date":"2023-07-11T14:12:42","date_gmt":"2023-07-11T14:12:42","guid":{"rendered":"https:\/\/townsvillages.com\/us\/?p=5547"},"modified":"2026-08-07T18:59:38","modified_gmt":"2026-08-07T18:59:38","slug":"jefferson-county-missouri","status":"publish","type":"post","link":"https:\/\/townsvillages.com\/us\/jefferson-county-missouri\/","title":{"rendered":"Jefferson County, Missouri"},"content":{"rendered":"

Jefferson County is a county in Missouri, United States, about 30 miles south of St. Louis along
\nthe Mississippi River. It had a population of 226,739 at the 2020 census, an estimated 233,132 by
\n2025, and covers 657 square miles (1,700 km2) of land plus 7.7 square miles (20 km2) of water,
\ncentred near 38\u00b016\u2032N 90\u00b032\u2032W.<\/p>\n

Hillsboro is the county seat; its postal code is 63050. The county holds 11 cities, 5 villages
\nand dozens of smaller unincorporated communities spread across 8 legacy townships, and it runs on
\nCentral Time. Its FIPS code is 29099.<\/p>\n

Towns & Villages in Jefferson County<\/h2>\n

Jefferson County has 16 incorporated places on record: 11 cities and 5 villages, a distinct
\nMissouri municipal category with its own charter but a smaller population threshold than a city.
\nBeyond these, the U.S. Census Bureau separately tracks 10 unincorporated CDPs (census designated
\nplaces, communities with no local government but a recognizable population cluster) and Wikipedia
\nnames another 39 smaller unincorporated hamlets and crossroads with no population figures of their
\nown.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Place<\/th>\nType<\/th>\nTownship<\/th>\nPop.<\/th>\nZIP<\/th>\n<\/tr>\n<\/thead>\n
Arnold<\/td>\nCity<\/td>\n—<\/td>\n20,858<\/td>\n63010<\/td>\n<\/tr>\n
Festus<\/td>\nCity<\/td>\n—<\/td>\n12,706<\/td>\n63028<\/td>\n<\/tr>\n
Eureka<\/td>\nCity<\/td>\n—<\/td>\n11,646<\/td>\n63025<\/td>\n<\/tr>\n
De Soto<\/td>\nCity<\/td>\n—<\/td>\n6,449<\/td>\n63020<\/td>\n<\/tr>\n
Pevely<\/td>\nCity<\/td>\n—<\/td>\n6,026<\/td>\n63070<\/td>\n<\/tr>\n
Crystal City<\/td>\nCity<\/td>\n—<\/td>\n4,740<\/td>\n63019<\/td>\n<\/tr>\n
Herculaneum<\/td>\nCity<\/td>\n—<\/td>\n4,672<\/td>\n63048<\/td>\n<\/tr>\n
Hillsboro<\/td>\nCity · seat<\/td>\n—<\/td>\n3,473<\/td>\n63050<\/td>\n<\/tr>\n
Byrnes Mill<\/td>\nCity<\/td>\n—<\/td>\n3,173<\/td>\n63051<\/td>\n<\/tr>\n
Olympian Village<\/td>\nCity<\/td>\n—<\/td>\n719<\/td>\n63020<\/td>\n<\/tr>\n
Lake Tekakwitha<\/td>\nVillage<\/td>\n—<\/td>\n230<\/td>\n63069<\/td>\n<\/tr>\n
Cedar Hill Lakes<\/td>\nVillage<\/td>\n—<\/td>\n203<\/td>\n—<\/td>\n<\/tr>\n
Scotsdale<\/td>\nVillage<\/td>\n—<\/td>\n194<\/td>\n—<\/td>\n<\/tr>\n
Parkdale<\/td>\nVillage<\/td>\nHigh Ridge<\/td>\n159<\/td>\n63049<\/td>\n<\/tr>\n
Kimmswick<\/td>\nCity<\/td>\n—<\/td>\n133<\/td>\n63053<\/td>\n<\/tr>\n
Peaceful Village<\/td>\nVillage<\/td>\nHigh Ridge<\/td>\n95<\/td>\n63049<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Eureka’s 11,646 residents are counted citywide; the city sits mainly in St. Louis County,
\nwith only a small southern edge of its limits reaching into Jefferson County. Herculaneum was the
\ncounty’s first seat from 1818 to 1839, before the honor passed to Hillsboro.<\/p>\n

The Census Bureau also tracks 10 unincorporated CDPs, ranked here by 2020 population:<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Place<\/th>\nType<\/th>\nTownship<\/th>\nPop.<\/th>\nZIP<\/th>\n<\/tr>\n<\/thead>\n
Murphy<\/td>\nCDP<\/td>\n—<\/td>\n8,425<\/td>\n63026<\/td>\n<\/tr>\n
Barnhart<\/td>\nCDP<\/td>\n—<\/td>\n5,832<\/td>\n63012<\/td>\n<\/tr>\n
Imperial<\/td>\nCDP<\/td>\n—<\/td>\n4,407<\/td>\n63052<\/td>\n<\/tr>\n
High Ridge<\/td>\nCDP<\/td>\nHigh Ridge<\/td>\n4,242<\/td>\n63049<\/td>\n<\/tr>\n
Raintree Plantation<\/td>\nCDP<\/td>\nCentral<\/td>\n1,996<\/td>\n63050<\/td>\n<\/tr>\n
Cedar Hill<\/td>\nCDP<\/td>\n—<\/td>\n1,875<\/td>\n63016<\/td>\n<\/tr>\n
LaBarque Creek<\/td>\nCDP<\/td>\n—<\/td>\n1,658<\/td>\n63069<\/td>\n<\/tr>\n
Summer Set<\/td>\nCDP<\/td>\nValle<\/td>\n1,127<\/td>\n63020<\/td>\n<\/tr>\n
Horine<\/td>\nCDP<\/td>\n—<\/td>\n657<\/td>\n63070<\/td>\n<\/tr>\n
Briarwood Estates<\/td>\nCDP<\/td>\nValle<\/td>\n347<\/td>\n63020<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Beyond the cities, villages and CDPs above, Wikipedia’s gazetteer for the county names 39
\nsmaller unincorporated communities with no census population of their own: Antonia, Bailey, Belews
\nCreek, Bushburg, Byrnesville, Danby, Dittmer, Donnell, Fletcher, Flucom, Frumet, Goldman,
\nGrubville, Hematite, House Springs, Jarvis, Knorpp, Liguori, Local, Ludwig, Mapaville, Melzo,
\nMeramec Heights, Morse Mill, Munsons, Oermann, Old Mines, Papin, Plattin, Regina, Riverside, Rush
\nTower, Seckman, Selma, Sulphur Springs, Valles Mines, Victoria, Vineland and Ware. Most are rural
\ncrossroads or former mining camps; mail there is delivered under the nearest incorporated town or
\nCDP’s ZIP rather than a code of their own.<\/p>\n

Townships<\/h2>\n

Missouri’s townships are legacy census subdivisions with no governing function today —
\nthe state abolished township government outside a handful of counties decades ago, and none of
\nJefferson County’s 8 survive as active local governments. The Census Bureau still uses them
\nto organize population counts.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n
Township<\/th>\nPop. (2020)<\/th>\nMain settlements<\/th>\n<\/tr>\n<\/thead>\n
Rock<\/td>\n32,673<\/td>\n—<\/td>\n<\/tr>\n
Joachim<\/td>\n20,694<\/td>\n—<\/td>\n<\/tr>\n
High Ridge<\/td>\n19,152<\/td>\nHigh Ridge<\/td>\n<\/tr>\n
Meramec<\/td>\n18,869<\/td>\n—<\/td>\n<\/tr>\n
Valle<\/td>\n15,362<\/td>\nBriarwood Estates, Summer Set<\/td>\n<\/tr>\n
Central<\/td>\n14,627<\/td>\nRaintree Plantation<\/td>\n<\/tr>\n
Plattin<\/td>\n11,817<\/td>\nPlattin<\/td>\n<\/tr>\n
Big River<\/td>\n6,137<\/td>\n—<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

ZIP Codes<\/h2>\n