Marion County, Indiana
Marion County, Indiana
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2295364

Marion County, Indiana

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2295364

Marion County, Indiana

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Marion County, Indiana

Marion County is located in the U.S. state of Indiana. The 2020 United States census reported a population of 977,203, making it the 54th-most populous county in the U.S., the most populous county in the state, and the main population center of the 11-county Indianapolis–Carmel–Greenwood MSA in central Indiana. Indianapolis is the county seat, the state capital, and most populous city. Marion County is consolidated with Indianapolis through an entity known as Unigov.

The low rolling hills of Marion County have been cleared of trees, and the area is completely devoted to municipal development or to agriculture, except for wooded drainages. The highest point (920 feet/280 meters ASL) is a small ridge at the county's northwest corner.

According to the 2010 census, the county has an 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.

The White River flows southwestward through the central part of the county; it is joined by Eagle Creek and Fall Creek, both of which have dams in the county forming Eagle Creek Reservoir and Geist Reservoir, respectively.

Marion County has two Indiana State Parks, Fort Harrison State Park and White River State Park, as well as many municipal parks.

Marion County was created on April 1, 1822, from part of the "New Purchase" lands that had been obtained from its inhabitants, the Lenape, by the Treaty of St. Mary's. It is named for Francis Marion, a brigadier general from South Carolina in the American Revolutionary War.

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.

In recent years, average temperatures in Indianapolis have ranged from a low of 20 °F (−7 °C) in January to a high of 86 °F (30 °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.

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