Decatur is a city located in Macon County, Illinois. As of the 2000 census, the city had a total population of 81,860. It is the county seat of Macon County6.


\nDecatur is located at 39°51'6" North, 88°56'39" West (39.851636, -88.944228)
1. According to the United States Census Bureau, the city has a total area of 118.8 km² (45.9 mi²). 107.6 km² (41.6 mi²) of it is land and 11.2 km² (4.3 mi²) of it is water. The total area is 9.42% water.


\nAs of the
census of 2000, there are 81,860 people, 34,086 households, and 21,099 families residing in the city. The population density is 760.5/km² (1,969.7/mi²). There are 37,239 housing units at an average density of 346.0/km² (896.0/mi²). The racial makeup of the city is 77.59% White, 19.47% African American, 0.17% Native American, 0.66% Asian, 0.02% Pacific Islander, 0.43% from other races, and 1.65% from two or more races. 1.19% of the population are Hispanic or Latino of any race. There are 34,086 households out of which 27.6% have children under the age of 18 living with them, 44.1% are married couples living together, 14.1% have a female householder with no husband present, and 38.1% are non-families. 32.7% of all households are made up of individuals and 13.0% have someone living alone who is 65 years of age or older. The average household size is 2.30 and the average family size is 2.90. In the city the population is spread out with 24.0% under the age of 18, 11.1% from 18 to 24, 26.0% from 25 to 44, 22.5% from 45 to 64, and 16.4% who are 65 years of age or older. The median age is 37 years. For every 100 females there are 87.9 males. For every 100 females age 18 and over, there are 83.9 males. The median income for a household in the city is $33,111, and the median income for a family is $42,379. Males have a median income of $36,920 versus $22,359 for females. The per capita income for the city is $19,009. 16.5% of the population and 12.1% of families are below the poverty line. Out of the total people living in poverty, 25.1% are under the age of 18 and 9.0% are 65 or older.