Population Demographics for Ottawa, Illinois in 2020, 2019
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| Total population in Ottawa | | | Total Population: | 18,768 | | Male Population: | 9,161 | | Female Population: | 9,607 |
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| Median age in Ottawa | | | Both sexes | 40 | | Male | 38 | | Female | 41 |
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| Population in households in Ottawa | | | Total Population: | 18,287 | | Male Population: | 8,883 | | Under 5 years: | 614 | | 5 to 9 years: | 658 | | 10 to 14 years: | 578 | | 15 to 17 years: | 366 | | 18 and 19 years: | 235 | | 20 years: | 91 | | 21 years: | 84 | | 22 to 24 years: | 336 | | 25 to 29 years: | 597 | | 30 to 34 years: | 563 | | 35 to 39 years: | 501 | | 40 to 44 years: | 598 | | 45 to 49 years: | 655 | | 50 to 54 years: | 708 | | 55 to 59 years: | 635 | | 60 and 61 years: | 210 | | 62 to 64 years: | 270 | | 65 and 66 years: | 134 | | 67 to 69 years: | 206 | | 70 to 74 years: | 247 | | 75 to 79 years: | 236 | | 80 to 84 years: | 222 | | 85 years and over: | 139 | | Female Population: | 9,404 | | Under 5 years: | 560 | | 5 to 9 years: | 597 | | 10 to 14 years: | 601 | | 15 to 17 years: | 376 | | 18 and 19 years: | 210 | | 20 years: | 105 | | 21 years: | 90 | | 22 to 24 years: | 357 | | 25 to 29 years: | 605 | | 30 to 34 years: | 531 | | 35 to 39 years: | 506 | | 40 to 44 years: | 603 | | 45 to 49 years: | 694 | | 50 to 54 years: | 761 | | 55 to 59 years: | 600 | | 60 and 61 years: | 210 | | 62 to 64 years: | 299 | | 65 and 66 years: | 181 | | 67 to 69 years: | 231 | | 70 to 74 years: | 346 | | 75 to 79 years: | 348 | | 80 to 84 years: | 310 | | 85 years and over: | 283 |
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| Average household size in Ottawa | | | Total: | 2 | | Under 18 years: | 0 | | 18 years and over: | 1 |
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| Number of occupied homes in Ottawa | | | Total: | 7,783 | | Family led homes: | 4,871 | | Husband-wife family: | 3,503 | | Other family: | 1,368 | | Population of male led with no wife present: | 389 | | Population female led with no husband present: | 979 | | Population of Nonfamily homes: | 2,912 | | Population living alone: | 2,505 | | Population not living alone: | 407 |
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| Total occupied homes in Ottawa with people under 18 years old: | | | Total: | 7,783 | | Population of homes with one or more people under 18 years: | 2,332 | | Population of family homes: | 2,297 | | Husband-wife family: | 1,440 | | Under 6 years only: | 312 | | Under 6 years and 6 to 17 years: | 349 | | 6 to 17 years only: | 779 | | Other family: | 857 | | Male householder, no wife present: | 232 | | Under 6 years only: | 74 | | Under 6 years and 6 to 17 years: | 38 | | 6 to 17 years only: | 120 | | Female led with no husband present: | 625 | | Under 6 years only: | 149 | | Under 6 years and 6 to 17 years: | 116 | | 6 to 17 years only: | 360 | | Nonfamily households: | 35 | | Male led households: | 27 | | Under 6 years only: | 9 | | Under 6 years and 6 to 17 years: | 2 | | 6 to 17 years only: | 16 | | Female led householder: | 8 | | Under 6 years only: | 0 | | Under 6 years and 6 to 17 years: | 2 | | 6 to 17 years only: | 6 | | Households with no people under 18 years: | 5,451 | | Family households: | 2,574 | | Husband-wife family: | 2,063 | | Other family: | 511 | | Male led with no wife present: | 157 | | Female led with no husband present: | 354 | | Nonfamily households: | 2,877 | | Male led householder: | 1,324 | | Female led householder: | 1,553 |
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| Total number led homes in Ottawa, by type | | | Total Home Population: | 7,783 | | Population of Family homes: | 4,871 | | Population of 15 to 24 year olds: | 136 | | Population of 25 to 34 year olds: | 802 | | Population of 35 to 44 year olds: | 945 | | Population of 45 to 54 year olds: | 1,142 | | Population of 55 to 59 year olds: | 481 | | Population of 60 to 64 year olds: | 383 | | Population of 65 to 74 year olds: | 492 | | Population of 75 to 84 year olds: | 395 | | Population of 85 year olds and over: | 95 | | Population of Nonfamily Homes: | 2,912 | | Population of 15 to 24 year olds: | 169 | | Population of 25 to 34 year olds: | 355 | | Population of 35 to 44 year olds: | 255 | | Population of 45 to 54 year olds: | 525 | | Population of 55 to 59 year olds: | 271 | | Population of 60 to 64 year olds: | 232 | | Population of 65 to 74 year olds: | 400 | | Population of 75 to 84 year olds: | 430 | | Population of 85 year olds and over: | 275 |
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| households in Ottawa containing people over 60 | | | Total Population: | 7,783 | | Population of homes with one or more people 60 years and over: | 2,872 | | 1-person household: | 1,277 | | 2-or-more-person household: | 1,595 | | Family households: | 1,522 | | Nonfamily households: | 73 | | Population of homes with no people 60 years and over: | 4,911 | | 1-person household: | 1,228 | | 2-or-more-person household: | 3,683 | | Family homes: | 3,349 | | Nonfamily homes: | 334 |
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| homes in Ottawa with multiple generations. | | | Total Population: | 7,783 | | Home has three or more generations: | 208 | | Home does not have three or more generations: | 7,575 |
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| Unmarried population in Ottawa under 18 years old in homes | | | Total Population: | 4,349 | | Unmarried partner of home lead present: | 459 | | In family homes: | 427 | | Population of male led and male partner homes: | 5 | | Population of male led and female partner households: | 205 | | Population of female led and female partner households: | 24 | | Population of female led and male partner households: | 193 | | In nonfamily homes: | 32 | | Population of male led and male partner homes: | 0 | | Population of male led and female partner homes: | 25 | | Population of female led and female partner homes: | 3 | | Population of female led and male partner homes: | 4 | | No unmarried partner of home lead present: | 3,890 | | In family homes: | 3,869 | | Population of husband-wife family homes: | 2,833 | | Population of male lead with no wife present, family homes: | 168 | | Population of female lead with no husband present, family homes: | 868 | | In nonfamily homes: | 21 |
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| Population in families living in Ottawa | | | Total Population: | 14,418 | | Population Under 18 years: | 4,231 | | Population 18 years and over: | 10,187 |
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| How long in Ottawa have lived in one place. | | | Total: | 7,783 | | Population of Owner occupied homes: | 5,228 | | Family home: | 3,742 | | Nonfamily homess: | 1,486 | | Male led home: | 637 | | Living alone: | 522 | | Not living alone: | 115 | | Female led home: | 849 | | Living alone: | 762 | | Not living alone: | 87 | | Population of Renter occupied homes: | 2,555 | | Family run homes: | 1,129 | | Husband-wife family: | 499 | | Other family: | 630 | | Male led with no wife present: | 158 | | Female led with no husband present: | 472 | | Nonfamily Homes: | 1,426 | | Male led homes: | 714 | | Male living alone: | 593 | | Male not living alone: | 121 | | Female led homes: | 712 | | Females living alone: | 628 | | Females not living alone: | 84 |
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