Indianapolis spreads across flat glacial till in Marion County, with the White River running north to south through the middle. Creeks, aging neighborhoods and wooded edges give pests and mosquitoes steady cover.
Indianapolis, a consolidated city and county seat in Marion County, had 887,642 residents at the 2020 census. Its 1821 plan called for a one-square-mile town around a central circle, which earned the Circle City nickname. The land is a flat to gently sloping glacial till plain at about 719 feet, and the White River runs roughly 31 miles through it, fed by about 35 streams.
The city is organized into 99 neighborhood areas, from Broad Ripple and Meridian-Kessler to Irvington and Castleton. The 1991 to 2020 climate normals show about 25.5 inches of snow, around 43 inches of precipitation and July highs near 85 degrees. Humid summers help mosquitoes breed, and cold snaps push beetles, mice and ants into buildings.