|Hamilton County, Indiana|
Hamilton County courthouse in Noblesville, Indiana
Location in the U.S. state of Indiana
Indiana's location in the U.S.
|Named for||Alexander Hamilton|
|• Total||402.44 sq mi (1,042 km2)|
|• Land||394.27 sq mi (1,021 km2)|
|• Water||8.17 sq mi (21 km2), 2.03%|
|• ( 2017)||323,747|
|• Density||690/sq mi (266/km2)|
|Time zone||Eastern: UTC−5/ −4|
Hamilton County’s roots are in agriculture. However, after World War II, Indianapolis grew north and towns in the southern part of the county developed as suburbs. Many farm fields have been replaced by both residential and commercial development. The northern portion of the county remains largely agricultural. Today, the county is one of the fastest-growing counties in the United States. According to 2007 estimates by the U.S. Census, the county’s population increased from an estimated 182,740 in 2000 to 261,661 in 2007, making it the fastest-growing county in Indiana out of 92. Recently[ when?], Hamilton County surpassed St. Joseph County in population, making it the fourth most populous in the state. 
Geist and Morse reservoirs are two man-made lakes in Hamilton County that offer residents and visitors recreational opportunities such as boating, fishing, and waterfront living.
In June 2008, Hamilton County was named America’s Best Place to Raise a Family by Forbes.com  due to its strong economy, affordable living, top-ranked schools, and close proximity to Indianapolis. The city of Carmel in southwestern Hamilton County was designated CNN Money's top place to live in 2013  and in 2017, the city of Fishers was named best place to live. 
The land containing Hamilton County was brought into the possession of the United States by the Treaty of St. Mary's in 1818. William Conner was the first white settler in the county. In the summer of 1822, after realizing there were enough settlers in the area, Conner and other settlers applied to the Indiana Legislature for a charter authorizing them to become a separate and independent county under Indiana law. The application was presented to the Legislature at the 1822-23 session and the act was passed and approved by the governor on January 8, 1823. The act took effect on the first Monday in April (April 7), 1823. The County Commissioners first met on May 5, 1823, at the house of William Conner. Conner’s house would also serve as the County Circuit Court. The county was named after Alexander Hamilton, the first secretary of the treasury.   
|Climate chart ( explanation)|
In recent years, average temperatures in Noblesville have ranged from a low of 17 °F (−8 °C) in January to a high of 85 °F (29 °C) in July, although a record low of −23 °F (−31 °C) was recorded in January 1994 and a record high of 105 °F (41 °C) was recorded in July 1954. Average monthly precipitation ranged from 2.42 inches (61 mm) in January to 4.86 inches (123 mm) in May. Hamilton County's climate thus falls within the Köppen climate classification system as a humid continental temperate climate, with pleasant spring and fall seasons surrounded by harsh cold and humid heat in the winter and summer, respectively. 
District 1 consists of Carmel and Clay Township. District 2 consists of Fishers, Noblesville, Delaware Township, and Noblesville Township. District 3 consists of Adams Township, Fall Creek Township, Jackson Township, Washington Township, Wayne Township, White River Township, Arcadia, Atlanta, Cicero, Sheridan and Westfield.
The current County Commissioners are:
- Christine Altman - District 1
- Steven C. Dillinger - District 2
- Mark Heirbrandt - District 3
District 1 consists of parts of Clay Township (45 precincts). District 2 consists of Delaware, Fall Creek and Wayne Townships. District 3 consists of Noblesville, Jackson and White River Townships. District 4 consists of parts of Clay Township (17 precincts), Adams and Washington Townships.
The current members of the County Council are:
- Fred Glynn - District 1
- Amy Massillamany - District 2
- Steve Schwartz1 - District 3
- Paul Ayers - District 4
- Brad Beaver - Council member at large
- Jim Belden - Council member at large
- Rick McKinney - Council member at large
Hamilton County is part of Indiana's 5th congressional district; Indiana Senate districts 20, 21, 28, 29 and 30;  and Indiana House of Representatives districts 29, 32, 35, 36, 38, 39, 86, 87 and 88. 
Hamilton County has been won by every Republican presidential candidate since Charles Evans Hughes in 1916. In 1912, Democratic candidate Woodrow Wilson had carried the county with a 3.06% majority over Republican opponent William Taft. 
Although Barack Obama got only 38.45% of Hamilton County's vote during the 2008 election, it is the best showing for a Democratic presidential candidate in this county since Franklin D. Roosevelt in 1936. 
Hamilton County's loyalty to the Republican Party is not limited to presidential elections. The county regularly rejects Democrats in gubernatorial and senatorial races, and is typically one of the Republicans' strongest counties at the state level. One of the few times in recent memory that Hamilton County has supported a Democrat for governor or Senate was in 1992, when Evan Bayh narrowly carried it with 50.48 percent of the vote in his successful reelection bid. However, Bayh lost Hamilton County in his three bids for Senate.
According to the 2010 census, the county has a total area of 402.44 square miles (1,042.3 km2), of which 394.27 square miles (1,021.2 km2) (or 97.97%) is land and 8.17 square miles (21.2 km2) (or 2.03%) is water. 
- Interstate 69
- Interstate 465
- U.S. Route 31
- U.S. Route 52
- U.S. Route 421
- State Road 19
- State Road 32
- State Road 37
- State Road 38
- State Road 47
- State Road 213
- Tipton County (North)
- Madison County (East)
- Hancock County (Southeast)
- Marion County (South)
- Boone County (West)
- Clinton County (Northwest)
|U.S. Decennial Census
1790-1960  1900-1990 
1990-2000  2010-2013 
As of the 2010 United States Census, there were 274,569 people, 99,835 households, and 74,755 families residing in the county.  The population density was 696.4 inhabitants per square mile (268.9/km2). There were 106,772 housing units at an average density of 270.8 per square mile (104.6/km2).  The racial makeup of the county was 88.5% white, 4.8% Asian, 3.5% black or African American, 0.2% American Indian, 1.2% from other races, and 1.8% from two or more races. Those of Hispanic or Latino origin made up 3.4% of the population.  In terms of ancestry, 29.0% were German, 14.6% were Irish, 13.0% were English, and 7.7% were American. 
Of the 99,835 households, 43.2% had children under the age of 18 living with them, 63.2% were married couples living together, 8.3% had a female householder with no husband present, 25.1% were non-families, and 20.5% of all households were made up of individuals. The average household size was 2.73 and the average family size was 3.19. The median age was 35.6 years. 
The median income for a household in the county was $47,697 and the median income for a family was $95,376. Males had a median income of $67,221 versus $44,273 for females. The per capita income for the county was $38,500. About 3.6% of families and 4.5% of the population were below the poverty line, including 5.6% of those under age 18 and 3.5% of those age 65 or over. 
- "Hamilton County QuickFacts". United States Census Bureau. Archived from the original on 2011-07-11. Retrieved 2011-09-17.
- "Hamilton takes top spot in county headcount". The Indianapolis Star. Gannett Company. 2008-03-21. Retrieved 2008-03-21.[ dead link]
- "In Depth: America's Best Places To Raise A Family - Forbes.com". Forbes. Archived from the original on 2016-03-03.
http://money.cnn.com/magazines/moneymag/bplive/2012/top100/. Missing or empty
|title=( help)[ dead link]
- "Fishers, Indiana is MONEY's No. 1 Best Place to Live in America". Money. Retrieved 2018-07-17.
- "Hamilton County stats". Indiana.edu. Archived from the original on 2007-07-08. Retrieved 2007-06-30.
- De Witt Clinton Goodrich & Charles Richard Tuttle (1875). An Illustrated History of the State of Indiana. Indiana: R. S. Peale & co. p. 560.
- Gannett, Henry (1905). The Origin of Certain Place Names in the United States. Govt. Print. Off. p. 147.
- "Monthly Averages for Noblesville, Indiana". The Weather Channel. Archived from the original on 2012-10-23. Retrieved 2011-01-27.
- "Indiana Senate Districts". State of Indiana. Archived from the original on 2011-01-15. Retrieved 2011-07-14.
- "Indiana House Districts". State of Indiana. Archived from the original on 2011-01-15. Retrieved 2011-07-14.
- David Leip's Presidential Atlas (Maps for Indiana by election) Archived 2008-11-30 at the Wayback Machine. Results prior to 1960 available through subscription only
- Leip, David. "Dave Leip's Atlas of U.S. Presidential Elections". uselectionatlas.org. Archived from the original on 2018-03-23.
- "Population, Housing Units, Area, and Density: 2010 - County". United States Census Bureau. Retrieved 2015-07-10.
- "Population and Housing Unit Estimates". Archived from the original on May 29, 2017. Retrieved June 9, 2017.
- "U.S. Decennial Census". United States Census Bureau. Archived from the original on May 12, 2015. Retrieved July 10, 2014.
- "Historical Census Browser". University of Virginia Library. Archived from the original on August 16, 2012. Retrieved July 10, 2014.
- "Population of Counties by Decennial Census: 1900 to 1990". United States Census Bureau. Archived from the original on October 4, 2014. Retrieved July 10, 2014.
- "Census 2000 PHC-T-4. Ranking Tables for Counties: 1990 and 2000" (PDF). United States Census Bureau. Archived (PDF) from the original on December 18, 2014. Retrieved July 10, 2014.
- "DP-1 Profile of General Population and Housing Characteristics: 2010 Demographic Profile Data". United States Census Bureau. Retrieved 2015-07-10.
- "DP02 SELECTED SOCIAL CHARACTERISTICS IN THE UNITED STATES – 2006-2010 American Community Survey 5-Year Estimates". United States Census Bureau. Retrieved 2015-07-10.
- "DP03 SELECTED ECONOMIC CHARACTERISTICS – 2006-2010 American Community Survey 5-Year Estimates". United States Census Bureau. Retrieved 2015-07-10.
- History of Hamilton County, Indiana, with Illustrations and Biographical Sketches of Some of its Prominent Men and Pioneers, To Which are Appended Maps of its Several Townships. Chicago: Kingman Brothers. 1880. Archived from the original on 2007-02-24. Retrieved 2007-03-25.
- "The fastest growing county in the state ... and then some". The Indianapolis Star. Retrieved 2007-03-25.
- "Hamilton's growth keeps it in Top 30". The Indianapolis Star. March 22, 2007. Retrieved 2007-03-25.
- "Hamilton County, Indiana Government Website". Hamilton County government. Retrieved 2007-03-26.