Population Demographics for Marion County, Illinois in 2020, 2019
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| Total population in Marion County | | | Total Population: | 39,437 | | Male Population: | 19,181 | | Female Population: | 20,256 |
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| Median age in Marion County | | | Both sexes | 41 | | Male | 39 | | Female | 43 |
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| Population in households in Marion County | | | Total Population: | 38,679 | | Male Population: | 18,835 | | Under 5 years: | 1,294 | | 5 to 9 years: | 1,178 | | 10 to 14 years: | 1,299 | | 15 to 17 years: | 895 | | 18 and 19 years: | 562 | | 20 years: | 226 | | 21 years: | 184 | | 22 to 24 years: | 641 | | 25 to 29 years: | 1,096 | | 30 to 34 years: | 1,054 | | 35 to 39 years: | 1,096 | | 40 to 44 years: | 1,119 | | 45 to 49 years: | 1,394 | | 50 to 54 years: | 1,458 | | 55 to 59 years: | 1,315 | | 60 and 61 years: | 502 | | 62 to 64 years: | 675 | | 65 and 66 years: | 381 | | 67 to 69 years: | 565 | | 70 to 74 years: | 721 | | 75 to 79 years: | 502 | | 80 to 84 years: | 374 | | 85 years and over: | 304 | | Female Population: | 19,844 | | Under 5 years: | 1,263 | | 5 to 9 years: | 1,198 | | 10 to 14 years: | 1,255 | | 15 to 17 years: | 834 | | 18 and 19 years: | 478 | | 20 years: | 241 | | 21 years: | 220 | | 22 to 24 years: | 624 | | 25 to 29 years: | 1,095 | | 30 to 34 years: | 1,047 | | 35 to 39 years: | 1,106 | | 40 to 44 years: | 1,159 | | 45 to 49 years: | 1,498 | | 50 to 54 years: | 1,511 | | 55 to 59 years: | 1,394 | | 60 and 61 years: | 530 | | 62 to 64 years: | 765 | | 65 and 66 years: | 406 | | 67 to 69 years: | 600 | | 70 to 74 years: | 848 | | 75 to 79 years: | 621 | | 80 to 84 years: | 518 | | 85 years and over: | 633 |
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| Average household size in Marion County | | | Total: | 2 | | Under 18 years: | 0 | | 18 years and over: | 1 |
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| Number of occupied homes in Marion County | | | Total: | 16,148 | | Family led homes: | 10,746 | | Husband-wife family: | 7,899 | | Other family: | 2,847 | | Population of male led with no wife present: | 778 | | Population female led with no husband present: | 2,069 | | Population of Nonfamily homes: | 5,402 | | Population living alone: | 4,650 | | Population not living alone: | 752 |
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| Total occupied homes in Marion County with people under 18 years old: | | | Total: | 16,148 | | Population of homes with one or more people under 18 years: | 4,985 | | Population of family homes: | 4,911 | | Husband-wife family: | 2,962 | | Under 6 years only: | 635 | | Under 6 years and 6 to 17 years: | 667 | | 6 to 17 years only: | 1,660 | | Other family: | 1,949 | | Male householder, no wife present: | 510 | | Under 6 years only: | 159 | | Under 6 years and 6 to 17 years: | 100 | | 6 to 17 years only: | 251 | | Female led with no husband present: | 1,439 | | Under 6 years only: | 405 | | Under 6 years and 6 to 17 years: | 286 | | 6 to 17 years only: | 748 | | Nonfamily households: | 74 | | Male led households: | 58 | | Under 6 years only: | 11 | | Under 6 years and 6 to 17 years: | 7 | | 6 to 17 years only: | 40 | | Female led householder: | 16 | | Under 6 years only: | 3 | | Under 6 years and 6 to 17 years: | 1 | | 6 to 17 years only: | 12 | | Households with no people under 18 years: | 11,163 | | Family households: | 5,835 | | Husband-wife family: | 4,937 | | Other family: | 898 | | Male led with no wife present: | 268 | | Female led with no husband present: | 630 | | Nonfamily households: | 5,328 | | Male led householder: | 2,410 | | Female led householder: | 2,918 |
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| Total number led homes in Marion County, by type | | | Total Home Population: | 16,148 | | Population of Family homes: | 10,746 | | Population of 15 to 24 year olds: | 435 | | Population of 25 to 34 year olds: | 1,573 | | Population of 35 to 44 year olds: | 1,952 | | Population of 45 to 54 year olds: | 2,381 | | Population of 55 to 59 year olds: | 1,063 | | Population of 60 to 64 year olds: | 964 | | Population of 65 to 74 year olds: | 1,438 | | Population of 75 to 84 year olds: | 715 | | Population of 85 year olds and over: | 225 | | Population of Nonfamily Homes: | 5,402 | | Population of 15 to 24 year olds: | 276 | | Population of 25 to 34 year olds: | 492 | | Population of 35 to 44 year olds: | 448 | | Population of 45 to 54 year olds: | 926 | | Population of 55 to 59 year olds: | 550 | | Population of 60 to 64 year olds: | 529 | | Population of 65 to 74 year olds: | 836 | | Population of 75 to 84 year olds: | 805 | | Population of 85 year olds and over: | 540 |
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| households in Marion County containing people over 60 | | | Total Population: | 16,148 | | Population of homes with one or more people 60 years and over: | 6,422 | | 1-person household: | 2,562 | | 2-or-more-person household: | 3,860 | | Family households: | 3,677 | | Nonfamily households: | 183 | | Population of homes with no people 60 years and over: | 9,726 | | 1-person household: | 2,088 | | 2-or-more-person household: | 7,638 | | Family homes: | 7,069 | | Nonfamily homes: | 569 |
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| homes in Marion County with multiple generations. | | | Total Population: | 16,148 | | Home has three or more generations: | 512 | | Home does not have three or more generations: | 15,636 |
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| Unmarried population in Marion County under 18 years old in homes | | | Total Population: | 9,207 | | Unmarried partner of home lead present: | 1,163 | | In family homes: | 1,070 | | Population of male led and male partner homes: | 11 | | Population of male led and female partner households: | 453 | | Population of female led and female partner households: | 15 | | Population of female led and male partner households: | 591 | | In nonfamily homes: | 93 | | Population of male led and male partner homes: | 0 | | Population of male led and female partner homes: | 84 | | Population of female led and female partner homes: | 1 | | Population of female led and male partner homes: | 8 | | No unmarried partner of home lead present: | 8,044 | | In family homes: | 8,022 | | Population of husband-wife family homes: | 5,627 | | Population of male lead with no wife present, family homes: | 423 | | Population of female lead with no husband present, family homes: | 1,972 | | In nonfamily homes: | 22 |
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| Population in families living in Marion County | | | Total Population: | 31,317 | | Population Under 18 years: | 8,929 | | Population 18 years and over: | 22,388 |
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| How long in Marion County have lived in one place. | | | Total: | 16,148 | | Population of Owner occupied homes: | 11,975 | | Family home: | 8,590 | | Nonfamily homess: | 3,385 | | Male led home: | 1,526 | | Living alone: | 1,260 | | Not living alone: | 266 | | Female led home: | 1,859 | | Living alone: | 1,671 | | Not living alone: | 188 | | Population of Renter occupied homes: | 4,173 | | Family run homes: | 2,156 | | Husband-wife family: | 913 | | Other family: | 1,243 | | Male led with no wife present: | 252 | | Female led with no husband present: | 991 | | Nonfamily Homes: | 2,017 | | Male led homes: | 942 | | Male living alone: | 788 | | Male not living alone: | 154 | | Female led homes: | 1,075 | | Females living alone: | 931 | | Females not living alone: | 144 |
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