World Library  
Flag as Inappropriate
Email this Article

Marion County, Indiana

Marion County, Indiana
Map of Indiana highlighting Marion County
Location in the state of Indiana
Map of the United States highlighting Indiana
Indiana's location in the U.S.
Founded April 01, 1822
Named for Francis Marion
Seat Indianapolis
Largest city Indianapolis
 • Total 403.01 sq mi (1,044 km2)
 • Land 396.30 sq mi (1,026 km2)
 • Water 6.71 sq mi (17 km2), 1.66%
Population (est.)
 • (2014) 934,243
 • Density 2,357/sq mi (880.5/km²)
Congressional districts 5th, 7th
Time zone Eastern: UTC-5/-4
Website /County/


  • Indiana county number 49
  • Most populous county in Indiana
  • Currently only Unigov county in Indiana
Marion County
Sheriff's Department
Agency overview
Legal personality Governmental: Government agency
Jurisdictional structure
Operations jurisdiction* County (US) of Marion in the state of Indiana, United States
Legal jurisdiction As per operations jurisdiction.
General nature
Operational structure
Agency executive John Layton, Sheriff
* Divisional agency: Division of the country, over which the agency has usual operational jurisdiction.

Marion County is a county located in the U.S. state of Indiana. Census 2010 recorded a population of 903,393,[1] making it the largest county in the state and 55th most populated county in the country, greater than the population of six states. The county seat is Indianapolis, the state capital and largest city.[2] Marion County is consolidated with Indianapolis through an arrangement known as Unigov.

Marion County is included in the Indianapolis-Carmel-Anderson, IN Metropolitan Statistical Area.


  • Geography 1
    • Adjacent counties 1.1
    • Major highways 1.2
  • History 2
  • Climate and weather 3
  • Demographics 4
  • Cities and towns 5
    • Municipalities 5.1
    • Townships 5.2
  • Politics 6
  • Notes 7
  • External links 8
  • References 9


According to the 2010 census, the county has a total area of 403.01 square miles (1,043.8 km2), of which 396.30 square miles (1,026.4 km2) (or 98.34%) is land and 6.71 square miles (17.4 km2) (or 1.66%) is water.[3]

Adjacent counties

Major highways


US Highways

Indiana Highways

* I-69 currently ends in Indianapolis at the I-465 interchange in the northeast section of the county. The extension connecting Indianapolis and Evansville is expected to be completed around 2018. Once fully completed the mainline of I-69 will travel from Brownsville, TX to Port Huron, MI.


Marion County was created on April 1, 1822, from part of the so-called "New Purchase" lands that had been obtained by the Treaty of St. Mary's; the Lenape had previously occupied the area.[4] It is named for Francis Marion, a Brigadier General from South Carolina in the American Revolutionary War.[5][6]

The state capital was moved to Indianapolis in Marion County from Corydon on January 10, 1825. This began a period of rapid growth in population.[6]

Climate and weather

Indianapolis, Indiana
Climate chart ()
Average max. and min. temperatures in °F
Precipitation totals in inches
Source: The Weather Channel[7]

In recent years, average temperatures in Indianapolis 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 °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.[7]


Age and gender distribution in Marion County

As of the 2010 United States Census, there were 903,393 people, 366,176 households, and 218,338 families residing in the county.[13] The population density was 2,279.6 inhabitants per square mile (880.2/km2). There were 417,862 housing units at an average density of 1,054.4 per square mile (407.1/km2).[3] The racial makeup of the county was 62.7% white, 26.7% black or African American, 2.0% Asian, 0.3% American Indian, 0.1% Pacific islander, 5.4% from other races, and 2.8% from two or more races. Those of Hispanic or Latino origin made up 9.3% of the population.[13] In terms of ancestry, 18.9% were German, 11.8% were Irish, 8.4% were English, 6.6% were American, and 5.2% were Subsaharan African.[14]

Of the 366,176 households, 32.3% had children under the age of 18 living with them, 36.9% were married couples living together, 17.1% had a female householder with no husband present, 40.4% were non-families, and 32.0% of all households were made up of individuals. The average household size was 2.42 and the average family size was 3.08. The median age was 33.9 years.[13]

The median income for a household in the county was $47,697 and the median income for a family was $54,142. Males had a median income of $42,215 versus $34,169 for females. The per capita income for the county was $24,498. About 13.5% of families and 17.3% of the population were below the poverty line, including 25.7% of those under age 18 and 9.0% of those age 65 or over.[15]

Cities and towns

Marion County has a consolidated city-county government, known as Unigov, in which only four municipalities retain full government autonomy (including a mayor and city council) as "excluded cities". The remaining municipalities within the county are "included towns" and exercise very limited authority, mainly in zoning and appointing their own police departments and maintaining some of their own municipal services and town identities. They retain the ability to levy taxes for these purposes. Since many of these included towns were and remain fairly wealthy and influential within the county, they can still have considerable unofficial clout. Likewise, some neighborhoods that had already been formally incorporated into Indianapolis (such as Broad Ripple) possess similar influence.

Downtown Indianapolis from the air.


Excluded cities in bold.


Marion County has nine townships roughly organized into a grid-like, three-by-three pattern. This arrangement can be seen below, with the top being north.


Presidential election results
Year Republican Democratic Others
2012 38.1% 136,102 60.2% 215,428 1.7% 6,137
2008 35.4% 134,313 63.8% 241,987 0.8% 3,062
2004 48.6% 156,072 50.6% 162,249 0.8% 2,376
2000 49.2% 140,169 47.9% 134,553 2.9% 6,569
1996 47.2% 133,329 44.1% 124,448 8.7% 24,437
1992 39.8% 141,369 37.8% 122,234 22.5% 60,187
1988 58.6% 184,519 40.8% 128,627 0.6% 1,949
1984 58.3% 184,880 41.0% 130,185 0.7% 2,083
1980 53.7% 168,680 40.1% 126,103 6.2% 19,486
1976 54.6% 177,767 44.6% 145,274 0.8% 2,535
1972 66.5% 206,065 33.0% 102,166 0.5% 1,535
1968 52.3% 162,503 37.2% 115,715 10.5% 32,704
1964 48.3% 143,015 51.4% 152,418 0.3% 948
1960 57.7% 166,202 42.1% 121,336 0.2% 668

Marion County was up until the mid-2000s a Republican stronghold in presidential elections, giving majorities to Republicans from 1968 to 2000. The county then began trending Democratic, with John Kerry winning a majority in 2004, the first Democrat since Lyndon B. Johnson in 1964. The trend continued in 2008 and 2012 with Barack Obama showing strongly in Marion County, winning 64% and 60% of the vote respectively.

Most of Marion County is in Indiana's 7th congressional district, which is held by Democrat André Carson. Indiana's 5th congressional district, which runs along the northern edge of the county, is held by Republican Susan Brooks. The county is represented by 15 seats in the Indiana House of Representatives, 86th through 100th districts, with ten seats held by Democrats and five by Republicans. In the State Senate Marion County is divided among nine districts, which are held by two Democrats and seven Republicans. The Senate districts are numbered 28 through 36.

The Indianapolis City-County Council is the combined legislative body of Indianapolis and Marion County. The consolidated government, known as Unigov, was formally established in 1970 upon the merger of the city government with the county government. The council passes ordinances for the city and county, and also makes appointments to certain boards and commissions.

County elected officials

County commissioners: Breaux, Fuentes, O'Connor


  1. ^ a b "Marion County QuickFacts".  
  2. ^ "Find a County". National Association of Counties. Retrieved 2011-06-07. 
  3. ^ a b "Population, Housing Units, Area, and Density: 2010 - County".  
  4. ^ Divita, James J. (1994). "Demography and Ethnicity". In Bodenhamer, David J.; Barrows, Robert G. The Encyclopedia of Indianapolis. Bloomington and Indianapolis: Indiana University Press. pp. 51–52.  
  5. ^ Baker, Ronald L.; Marvin Carmony (1995). Indiana Place Names. Bloomington: Indiana University Press. p. 98.  
  6. ^ a b De Witt Clinton Goodrich & Charles Richard Tuttle (1875). An Illustrated History of the State of Indiana. Indiana: R. S. Peale & co. p. 567. 
  7. ^ a b "Monthly Averages for Indianapolis, Indiana". The Weather Channel. Retrieved 2011-01-27. 
  8. ^ "Annual Estimates of the Resident Population for Incorporated Places: April 1, 2010 to July 1, 2014". Retrieved June 4, 2015. 
  9. ^ "U.S. Decennial Census". United States Census Bureau. Retrieved July 10, 2014. 
  10. ^ "Historical Census Browser". University of Virginia Library. Retrieved July 10, 2014. 
  11. ^ "Population of Counties by Decennial Census: 1900 to 1990". United States Census Bureau. Retrieved July 10, 2014. 
  12. ^ "Census 2000 PHC-T-4. Ranking Tables for Counties: 1990 and 2000" (PDF). United States Census Bureau. Retrieved July 10, 2014. 
  13. ^ a b c "DP-1 Profile of General Population and Housing Characteristics: 2010 Demographic Profile Data".  
  14. ^ "DP02 SELECTED SOCIAL CHARACTERISTICS IN THE UNITED STATES – 2006-2010 American Community Survey 5-Year Estimates".  
  15. ^ "DP03 SELECTED ECONOMIC CHARACTERISTICS – 2006-2010 American Community Survey 5-Year Estimates".  

External links

  • Indianapolis and Marion County Official Website
  • Marion County InDepth Profile: STATS Indiana
  • County Highlights: Marion County: Hoosiers by the Numbers


This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.