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| General Information: | |
| City Class | City |
| Class by Population | 6 |
| Land Area | 7.328 |
| Water Bodies | 0.334 |
| State | Illinois |
| Population(2000) | 18307 |
| Males: | 8738 |
| Females : | 9569 |
Map of Ottawa, Illinois:
| Races in Ottawa: | |
| White | 17440 |
| Black/African American | 251 |
| Hispanic | 954 |
| Asian | 152 |
| American Indian & Alaska Native | 27 |
| Native Hawaian Pacific Islander | 11 |
| Multi Race | 255 |
| Ohter Race | 171 |
| Population by Age: | |
| Under 5 years | 1180 |
| 5 to 17 Years | 3386 |
| 18 to 21 years | 900 |
| 22 to 29 years | 1639 |
| 30 to 39 yeras | 2579 |
| 40 to 49 years | 2751 |
| 50 to 64 years | 2587 |
| 64 and over | 3285 |
| Population Median Age: | |
| Average Median Age | 38.2 |
| Male Median Age | 36.4 |
| Female Median Age | 39.8 |
| Housing Information in Ottawa , IL | |
| Total Housing Units | 8030 |
| Urban Housing Units | NA |
| Rural Housing Unit | NA |
| Vacant Housing Units | 520 |
| Owner Occupied Housing Units | 5058 |
| Renter Occupied Housing Units | 2452 |
| Family & Family Size in Ottawa , IL: | |
| Number of families | 4892 |
| Average Family size | 2.98 |
| Househols Information in Ottawa , IL: | |
| Number of Household | 7510 |
| Average Household Size | 2.38 |
| 1-person household, male | 919 |
| 1-person household, female : | 1397 |
| Family HH(married-couple family, w/ own childern under 18 yrs) | 1614 |
| Family HH(married-couple family, no own childern under 18 yrs) | 2093 |
| Family HH, other family, male HH, no wife present, w/ own childern under 18 yrs | 163 |
| Family HH, other family, female HH, no husband present, w/ own childern under 18 yrs | 555 |
Zip code in Ottawa, Illinois:
| 61350 |