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Johnson County, Indiana
Johnson Indiana courthouse.jpg
Johnson County courthouse in Franklin, Indiana
Map of Indiana highlighting Johnson County
Location in the state of Indiana
Map of the U.S. highlighting Indiana
Indiana's location in the U.S.
Founded 1823
Seat Franklin
 - Total
 - Land
 - Water

321.56 sq mi (833 km²)
320.19 sq mi (829 km²)
1.36 sq mi (4 km²), 0.42%
 - (2010)
 - Density

436/sq mi (168.4/km²)
Congressional districts 4th, 5th, 6th

Indiana county number 41

Johnson County is a county located in the U.S. state of Indiana. As of 2010, the population was 139,654. The county seat is Franklin[1].

Major highways[]

  • I-65.svg Interstate 65
  • US 31.svg U.S. Route 31
  • Indiana 37.svg Indiana State Road 37
  • Indiana 44.svg Indiana State Road 44
  • Indiana 252.svg Indiana State Road 252
  • Indiana 144.svg Indiana State Road 144
  • Indiana 135.svg Indiana State Road 135
  • Indiana 431.svg Indiana State Road 431


According to the 2000 census, the county has a total area of 321.56 square miles (832.8 km2), of which 320.19 square miles (829.3 km2) (or 99.57%) is land and 1.36 square miles (3.5 km2) (or 0.42%) is water.[2]

Adjacent counties[]


Johnson County was formed in 1823. It was named for John Johnson, a judge of the Indiana Supreme Court. This is probably John Johnson of Knox County, delegate to the State constitutional convention, appointed to the Supreme Court in 1816.

Cities and towns[]

  • Bargersville
  • Edinburgh
  • Franklin
  • Greenwood
  • New Whiteland
  • Princes Lakes
  • Trafalgar
  • Whiteland


  • Farwest


  • Blue River
  • Clark
  • Franklin
  • Hensley
  • Needham
  • Nineveh
  • Pleasant
  • Union
  • White River

The south end of the county is also home to the Camp Atterbury military installation.

Climate and weather[]

Climate chart for Franklin, Indiana
temperatures in °Cprecipitation totals in mm
source: The Weather Channel[3]

In recent years, average temperatures in Franklin have ranged from a low of 18 °F (−8 °C) in January to a high of 84 °F (29 °C) in July, although a record low of −22 °F (−30.0 °C) was recorded in January 1985 and a record high of 104 °F (40 °C) was recorded in June 1988. Average monthly precipitation ranged from 2.05 inches (52 mm) in January to 4.78 inches (121 mm) in July.[3]


The county government is a constitutional body, and is granted specific powers by the Constitution of Indiana, and by the Indiana Code.

County Council: The county council is the legislative branch of the county government and controls all the spending and revenue collection in the county. Representatives are elected from county districts. The council members serve four year terms. They are responsible for setting salaries, the annual budget, and special spending. The council also has limited authority to impose local taxes, in the form of an income and property tax that is subject to state level approval, excise taxes, and service taxes.[4][5]

Board of Commissioners: The executive body of the county is made of a board of commissioners. The commissioners are elected county-wide, in staggered terms, and each serves a four-year term. One of the commissioners, typically the most senior, serves as president. The commissioners are charged with executing the acts legislated by the council, collecting revenue, and managing the day-to-day functions of the county government.[4][5]

Court: The county maintains a small claims court that can handle some civil cases. The judge on the court is elected to a term of four years and must be a member of the Indiana Bar Association. The judge is assisted by a constable who is also elected to a four-year term. In some cases, court decisions can be appealed to the state level circuit court.[5]

County Officials: The county has several other elected offices, including sheriff, coroner, assessor, auditor, recorder, surveyor, and circuit court clerk Each of these elected officers serves terms of four years and oversee different parts of the county government. Members elected to county government positions are required to declare party affiliations and to be residents of the county.[5]

Johnson County is part of Indiana's 4th, 5th and 6th congressional districts; Indiana Senate districts 32, 35, 36, 37 and 41;[6] and Indiana House of Representatives districts 47, 58, 59 and 93.[7]


Johnson County
Population by year

2010 139,654
2000 115,209
1990 88,109
1980 77,240
1970 61,138
1960 43,704
1950 26,183
1940 22,493
1930 21,706
1920 20,739
1910 20,394
1900 20,223
1890 19,561
1880 19,537
1870 18,366
1860 14,854
1850 12,101
1840 9,352
1830 4,019

As of the census[8] of 2000, there were 115,209 people, 42,434 households, and 31,613 families residing in the county. The population density was 360 people per square mile (139/km²). There were 45,095 housing units at an average density of 141 per square mile (54/km²). The racial makeup of the county was 97.04% White, 0.79% Black or African American, 0.18% Native American, 0.84% Asian, 0.03% Pacific Islander, 0.48% from other races, and 0.65% from two or more races. 1.38% of the population were Hispanic or Latino of any race. 26.5% were of German, 19.6% American, 12.4% English and 10.9% Irish ancestry according to Census 2000.

There were 42,434 households out of which 37.40% had children under the age of 18 living with them, 62.00% were married couples living together, 9.00% had a female householder with no husband present, and 25.50% were non-families. 21.20% of all households were made up of individuals and 7.30% had someone living alone who was 65 years of age or older. The average household size was 2.63 and the average family size was 3.06.

In the county the population was spread out with 27.20% under the age of 18, 8.70% from 18 to 24, 30.80% from 25 to 44, 22.30% from 45 to 64, and 11.00% who were 65 years of age or older. The median age was 35 years. For every 100 females there were 96.00 males. For every 100 females age 18 and over, there were 92.80 males.

The median income for a household in the county was $52,693, and the median income for a family was $60,571. Males had a median income of $42,272 versus $28,181 for females. The per capita income for the county was $22,976. About 3.30% of families and 5.60% of the population were below the poverty line, including 5.70% of those under age 18 and 7.70% of those age 65 or over.

See also[]

  • National Register of Historic Places listings in Johnson County, Indiana*

External links[]


  • Forstall, Richard L. (editor) (1996). Population of states and counties of the United States: 1790 to 1990 : from the twenty-one decennial censuses. United States Department of Commerce, Bureau of the Census, Population Division. ISBN 0-934213-48-8. 

Coordinates: 39°29′N 86°06′W / 39.49, -86.10

This page uses content from the English language Wikipedia. The original content was at Johnson County, Indiana. The list of authors can be seen in the page history. As with this Familypedia wiki, the content of Wikipedia is available under the Creative Commons License.