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| General Information: | |
| City Class | City |
| Class by Population | 7 |
| Land Area | 41.558 |
| Water Bodies | 4.317 |
| State | Illinois |
| Population(2000) | 81860 |
| Males: | 38303 |
| Females : | 43557 |
Map of Decatur, Illinois:
| Races in Decatur: | |
| White | 63519 |
| Black/African American | 15940 |
| Hispanic | 978 |
| Asian | 540 |
| American Indian & Alaska Native | 141 |
| Native Hawaian Pacific Islander | 15 |
| Multi Race | 1351 |
| Ohter Race | 354 |
| Population by Age: | |
| Under 5 years | 5479 |
| 5 to 17 Years | 14150 |
| 18 to 21 years | 5738 |
| 22 to 29 years | 8548 |
| 30 to 39 yeras | 10185 |
| 40 to 49 years | 11781 |
| 50 to 64 years | 12580 |
| 64 and over | 13399 |
| Population Median Age: | |
| Average Median Age | 37.2 |
| Male Median Age | 35.4 |
| Female Median Age | 38.7 |
| Housing Information in Decatur , IL | |
| Total Housing Units | 37239 |
| Urban Housing Units | NA |
| Rural Housing Unit | NA |
| Vacant Housing Units | 3153 |
| Owner Occupied Housing Units | 22623 |
| Renter Occupied Housing Units | 11463 |
| Family & Family Size in Decatur , IL: | |
| Number of families | 21088 |
| Average Family size | 2.9 |
| Househols Information in Decatur , IL: | |
| Number of Household | 34086 |
| Average Household Size | 2.3 |
| 1-person household, male | 4572 |
| 1-person household, female : | 6565 |
| Family HH(married-couple family, w/ own childern under 18 yrs) | 5530 |
| Family HH(married-couple family, no own childern under 18 yrs) | 9491 |
| Family HH, other family, male HH, no wife present, w/ own childern under 18 yrs | 669 |
| Family HH, other family, female HH, no husband present, w/ own childern under 18 yrs | 3195 |
Zip code in Decatur, Illinois:
| 62521 | 62522 | 62523 | 62524 | 62525 |
| 62526 | 62527 |