Hamilton County is a county in the U.S. state of Indiana. Census 2010 recorded a population of 274,569. The county seat is Noblesville.
Hamilton County is part of the Indianapolis-Carmel-Anderson, IN Metropolitan Statistical Area. Since the beginning of the 21st century, Hamilton County has been the second most populous county in Central Indiana.
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. Residential and commercial development have replaced many farm fields. The northern part 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, Hamilton County surpassed St. Joseph County in population, making it the state's fourth most populous. It is also the third densest in the state, after Marion and Lake Counties.
In 2010, Hamilton County was home to three of the state's 20 largest cities and towns: Carmel (8th), Fishers (9th), and Noblesville (14th).
Geist and Morse reservoirs are two man-made lakes in Hamilton County that offer 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.
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