Jefferson County , Missouri

County in Missouri, United States

Jefferson County, MO locator map
Location of Jefferson County, MO on Missouri map.


Jefferson County is a county located in the U.S. state of Missouri. As of the 2010 census, the population was 218,733 and a population density of 127 people per km². After 9 years in 2019 county had an estimated population of 225,081 inhabitants. Its county seat is Hillsboro. The county was created 203 years ago in 1817.

The county has a total area of 664.10 square miles (1720 km2).

Jefferson County map

Jefferson County, MO Quick Facts

Population : 225,081 (2019)
Country : United States of America
State : Missouri
Different from : Jefferson County
Area : 1720 km2
Water as percent of area : 1.2%
Land as percent of area : 98.8%
Named for : Thomas Jefferson
Capital : Hillsboro
Establishment : January 01, 1818
Time Zone : America/Chicago
Local time : 22:47:23 (11th April 2021)
Density : 131 Pop. per km² as of 2019
Population growth : 2.82% (2010-2019)
Weather : 72℉ Sunny 7-days weather

Jefferson County, MO has 6 neighbors .

Year Population Method
2010 218,733 census
2011 219,594 estimation process
2012 219,853 estimation process
2013 220,870 estimation process
2014 222,006 estimation process
2015 223,116 estimation process
2016 223,377 estimation process
2017 223,769 estimation process
2018 224,410 estimation process
2019 225,081 estimation process

The population of Jefferson County increased by 2.82% in 9 years.

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People born in Jefferson County, MO (2)

Many people were born here, including politician Samuel Byrns, politician Paul Wieland, you can see a list of people who born in Jefferson County, MO.

Jefferson County, MO Populated Places

Cities, Towns, Neighborhoods & Other Populated Places in Jefferson County, MO.

City Name Population Title
Arnold 21,091 City in Missouri
Festus 12,036 City in Missouri
De Soto 6,345 City in Jefferson County, Missouri
Pevely 5,978 City
Crystal City 4,700 City
Herculaneum 4,138 Roman town
Riverside 3,505 City in Platte County, Missouri, United States
Hillsboro 3,292 City in Missouri, United States
Byrnes Mill 3,002 City
Olympian Village 752 City
Cedar Hill Lakes 227 Village in Jefferson County, Missouri, United States
Scotsdale 216 Human settlement in Jefferson County, Missouri, United States of America
Parkdale 166 Human settlement in Jefferson County, Missouri, United States of America
Kimmswick 143 City

Missouri Other Counties (more counties)

County Name Population Title
Saint Louis County 994,205 County in Minnesota, United States
Jackson County 703,011 County in Oregon, United States
Kansas City 495,327 Largest municipality in the U.
Saint Charles County 402,022 County in Missouri, United States
St. Louis 315,685 City in Missouri, United States
Greene County 293,086 County in Tennessee, United States
Clay County 249,948 County in North Carolina, United States
Boone County 180,463 County in West Virginia, United States
Columbia 123,195 City in Missouri, United States
Jasper County 121,328 County in South Carolina, United States
Cass County 105,780 County in Missouri, United States
Platte County 104,418 County in Wyoming, United States
Franklin County 103,967 County in Missouri, United States
Lee's Summit 99,357 City in Missouri, United States
Castle Point 90,070 Non-metropolitan district in Essex, UK
O'Fallon 88,673 City in St.
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