Jefferson County, Missouri

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Jefferson County, Missouri
Seal of Jefferson County, Missouri
Map of Missouri highlighting Jefferson County
Location in the state of Missouri
Map of the United States highlighting Missouri
Missouri's location in the U.S.
Largest cityArnold
 • Total664.09 sq mi (1,720 km2)
 • Land656.80 sq mi (1,701 km2)
 • Water7.29 sq mi (19 km2), 1.10%
Population (Est.)
 • (2012)222,209
 • Density335/sq mi (129.45/km²)
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Jefferson County, Missouri
Seal of Jefferson County, Missouri
Map of Missouri highlighting Jefferson County
Location in the state of Missouri
Map of the United States highlighting Missouri
Missouri's location in the U.S.
Largest cityArnold
 • Total664.09 sq mi (1,720 km2)
 • Land656.80 sq mi (1,701 km2)
 • Water7.29 sq mi (19 km2), 1.10%
Population (Est.)
 • (2012)222,209
 • Density335/sq mi (129.45/km²)

Jefferson County is a county located in east central Missouri in the United States. The county was included as the mean center of U.S. population in 1980. As of the 2010 census, the population was 218,733,[1] making it the sixth most populous county in Missouri. Its county seat is Hillsboro. The county was organized in 1818 and named in honor of former President Thomas Jefferson. Governor Mel Carnahan was killed near Goldman, Missouri in a plane crash on October 16, 2000.

Jefferson County is part of the St. Louis Metro Area and encompasses many of the city's southern suburbs.


According to the 2000 U.S. Census, the county has a total area of 664.09 square miles (1,720.0 km2), of which 656.80 square miles (1,701.1 km2) (or 98.90%) is land and 7.29 square miles (18.9 km2) (or 1.10%) is water.[2] Much of Jefferson County will be in the totality path of the solar eclipse of August 21, 2017.

Adjacent counties[edit]

Major highways[edit]

National Protected Area[edit]


Historical populations
Est. 2012220,2090.7%
U.S. Decennial Census[3]
2012 Estimate[1]

As of the census[4] of 2000, there were 198,099 people, 71,499 households, and 54,553 families residing in the county. The population density was 302 inhabitants per square mile (117 /km2). There were 75,586 housing units at an average density of 115 per square mile (44/km²). The racial makeup of the county was 97.48% White, 0.08% Black or African American, 0.29% Native American, 0.36% Asian, 0.01% Pacific Islander, 0.24% from other races, and 0.93% from two or more races. Approximately 1.01% of the population were Hispanic or Latino of any race.

There were 71,499 households out of which 38.90% had children under the age of 18 living with them, 61.00% were married couples living together, 10.40% had a female householder with no husband present, and 23.70% were non-families. 18.90% of all households were made up of individuals and 6.10% had someone living alone who was 65 years of age or older. The average household size was 2.74 and the average family size was 3.12.

In the county the population was spread out with 27.90% under the age of 18, 8.50% from 18 to 24, 31.80% from 25 to 44, 22.50% from 45 to 64, and 9.20% who were 65 years of age or older. The median age was 35 years. For every 100 females there were 98.90 males. For every 100 females age 18 and over, there were 95.90 males.

The median income for a household in the county was $60,636, and the median income for a family was $66,697. Males had a median income of $37,822 versus $25,440 for females. The per capita income for the county was $25,058. About 4.90% of families and 6.80% of the population were below the poverty line, including 8.10% of those under age 18 and 6.30% of those age 65 or over.

There were 146,316 registered voters in 2008.[5] As of Oct. 24, 2012, there were 148,011.[6]

Cities and towns[edit]

† incorporated


Public Schools[edit]

Private Schools[edit]

Post Secondary[edit]

ITT Technical Institute - Arnold

Jefferson College - Hillsboro A public, two-year community college.

County Parks and Recreation[edit]

  • Big River Saddle Club
  • Brown's Ford
  • Cedar Hill
  • Fletcher House
  • High Ridge Civic Center
  • Rockford Beach
  • Jefferson Winter Park
  • Minnie Ha Ha Park
  • Morse Mill
  • Pleasant Valley
  • Sunridge
  • NW Jefferson County Sports Complex



The Democratic Party predominantly controls politics at the local level in Jefferson County. Democrats hold all but two of the elected positions in the county.

Jefferson County, Missouri
Elected countywide officials
AssessorTerry RoeschDemocratic
Circuit ClerkHoward WagnerDemocratic
County ClerkWes WagnerDemocratic
CollectorBeth MahnDemocratic
Ken WallerRepublican
Prosecuting AttorneyForrest WeggeDemocratic
Public AdministratorBruce KingDemocratic
RecorderDebbie DunneganRepublican
SheriffOliver Glenn BoyerDemocratic
TreasurerLinda NeesDemocratic


Past Gubernatorial Elections Results
YearRepublicanDemocraticThird Parties
200834.42% 35,94763.87% 66,6971.71% 1,781
200449.23% 45,89149.25% 45,9091.52% 1,424
200047.05% 36,06049.33% 37,8083.62% 2,775
199643.90% 28,98652.96% 34,9703.14% 2,077

Jefferson County is divided into seven legislative districts in the Missouri House of Representatives; four of which are held by Democrats and three of which are held by Republicans. Prior to the 2010 midterm elections, all seven seats were held by Democrats.

Missouri House of Representatives - District 90 - Jefferson County (2010)
RepublicanJohn C. McCaherty4,98049.09
DemocraticSam Komo4,72746.59
IndependentCharles Smith, Jr.4384.32
Missouri House of Representatives - District 101 - Jefferson County (2010)
DemocraticTimothy G. Meadows5,96856.33
RepublicanCharles Huey4,62643.67
Missouri House of Representatives - District 102 - Jefferson County (2010)
RepublicanPaul Wieland5,92850.34
DemocraticJeff Roorda4,96442.16
ConstitutionRichard Blowers8837.50
Missouri House of Representatives - District 103 - Jefferson County (2010)
DemocraticRon Casey6,22851.94
RepublicanBob Engelbach5,76348.06
Missouri House of Representatives - District 104 - Jefferson County (2010)
DemocraticJoseph Fallert, Jr.4,164100.00
Missouri House of Representatives - District 105 - Jefferson County (2010)
RepublicanPaul Curtman4,83656.34
DemocraticMichael Frame3,74843.66
Missouri House of Representatives - District 110 - Jefferson County (2010)
DemocraticBen Harris3,67056.05
RepublicanCarrie Cabral2,87843.95

Jefferson County is also divided into two districts in the Missouri Senate.

Missouri Senate - District 3 - Jefferson County (2008)
RepublicanKevin Engler10,86154.73
DemocraticDennis Riche8,98445.27
Missouri Senate - District 22 - Jefferson County (2010)
DemocraticRyan McKenna27,38052.57
RepublicanGreg Zotta24,70147.43


All of Jefferson County is included in Missouri's 3rd Congressional District and is currently represented by Russ Carnahan (D-St. Louis) in the U.S. House of Representatives. Following redistricting, Jefferson County was carved up into multiple districts and will be represented by three U.S. Representatives in 2012.

U.S. House of Representatives - District 3 - Jefferson County (2010)
RepublicanEd Martin37,65956.99
DemocraticRuss Carnahan*24,23736.68
LibertarianSteven R. Hedrick2,4603.72
ConstitutionNicholas J. Ivanovich1,7252.61

Political Culture[edit]

Past Presidential Elections Results
YearRepublicanDemocraticThird Parties
200847.91% 50,80450.42% 53,4671.67% 1,779
200449.99% 46,62449.38% 46,0570.63% 583
200047.62% 36,76650.02% 38,6162.36% 1,822
199636.12% 23,87748.52% 32,07315.36% 10,152

A predominantly suburban county, Jefferson County is fairly independent-leaning at the federal level but does have a tendency to tilt Democratic. Presidential elections in Jefferson County are almost always extremely close; George W. Bush just narrowly carried the county in 2004 by less than 600 votes and by just over a half of a percentage point. Al Gore and Barack Obama also just narrowly carried the county in 2000 and 2008, respectively. Bill Clinton, however, did manage to carry Jefferson County by double digits both times in 1992 and 1996.

Typical of the suburban culture in most counties throughout the country, voters in Jefferson County tend to be rather centrist on social issues but more liberal on economic issues. In 2004, Missourians voted on a constitutional amendment to define marriage as the union between a man and a woman—it overwhelmingly passed Jefferson County with 72.56 percent of the vote. The initiative passed the state with 71 percent of support from voters as Missouri became the first state to ban same-sex marriage. In 2006, Missourians voted on a constitutional amendment to fund and legalize embryonic stem cell research in the state—it narrowly passed Jefferson County with 51.85 percent voting for the measure. The initiative narrowly passed the state with 51 percent of support from voters as Missouri became one of the first states in the nation to approve embryonic stem cell research. In 2006, Missourians voted on a proposition (Proposition B) to increase the minimum wage in the state to $6.50 an hour—it passed Jefferson County with 79.90 percent of the vote. The proposition strongly passed every single county in Missouri with 78.99 percent voting in favor as the minimum wage was increased to $6.50 an hour in the state. During the same election, voters in five other states also strongly approved increases in the minimum wage.

2008 Missouri Presidential Primary[edit]


U.S. Senator John McCain (R-Arizona) won Jefferson County with 33.54 percent of the vote. Former Governor Mitt Romney (R-Massachusetts finished in a not-so-distant second place with 30.45 percent of the vote while former Governor Mike Huckabee (R-Arkansas) came in third place with 30.19 percent in Jefferson County. Libertarian-leaning U.S. Representative Ron Paul (R-Texas) finished a distant fourth place with 3.94 percent of the vote in Jefferson County.

Huckabee slightly led Missouri throughout much of the evening until the precincts began reporting from St. Louis where McCain won and put him over the top of Huckabee. In the end, McCain received 32.95 percent of the vote to Huckabee’s 31.53 percent—a 1.42 percent difference. McCain received all of Missouri’s 58 delegates as the Republican Party utilizes the winner-take-all system.


Former U.S. Senator and now Secretary of State Hillary Rodham Clinton (D-New York) won Jefferson County over now President Barack Obama (D-Illinois) by an almost two-to-one margin with 61.32 percent of the vote while Obama received 35.02 percent of the vote. Although he withdrew from the race, former U.S. Senator John Edwards (D-North Carolina) still received 2.74 percent of the vote in Jefferson County. Jefferson County gave Clinton one of her strongest showings in a predominantly suburban county in the entire country.

Clinton had a large initial lead in Missouri at the beginning of the evening as the rural precincts began to report, leading several news organizations to call the state for her; however, Obama rallied from behind as the heavily African American precincts from St. Louis began to report and eventually put him over the top. In the end, Obama received 49.32 percent of the vote to Clinton’s 47.90 percent—a 1.42 percent difference. Both candidates split Missouri’s 72 delegates as the Democratic Party utilizes proportional representation.

See also[edit]


  1. ^ a b "State & County QuickFacts". United States Census Bureau. Retrieved September 9, 2013. 
  2. ^ "Census 2010 Gazetteer Files". Retrieved July 2, 2013. 
  3. ^ "U.S. Decennial Census". Retrieved September 9, 2013. 
  4. ^ "American FactFinder". United States Census Bureau. Retrieved 2008-01-31. 
  5. ^ "Registered Voters in Missouri 2008". 
  6. ^ Retrieved on Jul. 9, 2013

External links[edit]

Coordinates: 38°16′N 90°32′W / 38.26°N 90.54°W / 38.26; -90.54