Population Demographics for Grundy County, Illinois in 2020, 2019
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| | Male | Female | Total | | Total Population | 24,977 | 25,086 | 50,063 | | White | 23,366 | 23,567 | 46,933 | | Hispanic or Latino | 2,143 | 1,953 | 4,096 | | Some Other Race | 726 | 610 | 1,336 | | Two or More Races | 363 | 370 | 733 | | Black or African American | 324 | 281 | 605 | | Asian | 140 | 187 | 327 | | American Indian | 53 | 61 | 114 |
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| Total population in Grundy County | | | Total Population: | 50,063 | | Male Population: | 24,977 | | Female Population: | 25,086 |
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| Median age in Grundy County | | | Both sexes | 36 | | Male | 35 | | Female | 36 |
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| Population in households in Grundy County | | | Total Population: | 49,809 | | Male Population: | 24,897 | | Under 5 years: | 1,896 | | 5 to 9 years: | 2,034 | | 10 to 14 years: | 1,911 | | 15 to 17 years: | 1,176 | | 18 and 19 years: | 648 | | 20 years: | 290 | | 21 years: | 245 | | 22 to 24 years: | 720 | | 25 to 29 years: | 1,598 | | 30 to 34 years: | 1,809 | | 35 to 39 years: | 1,783 | | 40 to 44 years: | 1,892 | | 45 to 49 years: | 1,945 | | 50 to 54 years: | 1,799 | | 55 to 59 years: | 1,545 | | 60 and 61 years: | 509 | | 62 to 64 years: | 726 | | 65 and 66 years: | 339 | | 67 to 69 years: | 512 | | 70 to 74 years: | 646 | | 75 to 79 years: | 365 | | 80 to 84 years: | 277 | | 85 years and over: | 232 | | Female Population: | 24,912 | | Under 5 years: | 1,741 | | 5 to 9 years: | 1,855 | | 10 to 14 years: | 1,928 | | 15 to 17 years: | 1,115 | | 18 and 19 years: | 600 | | 20 years: | 281 | | 21 years: | 208 | | 22 to 24 years: | 814 | | 25 to 29 years: | 1,641 | | 30 to 34 years: | 1,747 | | 35 to 39 years: | 1,821 | | 40 to 44 years: | 1,847 | | 45 to 49 years: | 1,912 | | 50 to 54 years: | 1,717 | | 55 to 59 years: | 1,494 | | 60 and 61 years: | 516 | | 62 to 64 years: | 690 | | 65 and 66 years: | 391 | | 67 to 69 years: | 548 | | 70 to 74 years: | 651 | | 75 to 79 years: | 530 | | 80 to 84 years: | 438 | | 85 years and over: | 427 |
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| Average household size in Grundy County | | | Total: | 2 | | Under 18 years: | 0 | | 18 years and over: | 1 |
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| Number of occupied homes in Grundy County | | | Total: | 18,546 | | Family led homes: | 13,431 | | Husband-wife family: | 10,711 | | Other family: | 2,720 | | Population of male led with no wife present: | 927 | | Population female led with no husband present: | 1,793 | | Population of Nonfamily homes: | 5,115 | | Population living alone: | 4,174 | | Population not living alone: | 941 |
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| Total occupied homes in Grundy County with people under 18 years old: | | | Total: | 18,546 | | Population of homes with one or more people under 18 years: | 7,151 | | Population of family homes: | 7,070 | | Husband-wife family: | 5,219 | | Under 6 years only: | 1,190 | | Under 6 years and 6 to 17 years: | 1,247 | | 6 to 17 years only: | 2,782 | | Other family: | 1,851 | | Male householder, no wife present: | 607 | | Under 6 years only: | 189 | | Under 6 years and 6 to 17 years: | 101 | | 6 to 17 years only: | 317 | | Female led with no husband present: | 1,244 | | Under 6 years only: | 244 | | Under 6 years and 6 to 17 years: | 209 | | 6 to 17 years only: | 791 | | Nonfamily households: | 81 | | Male led households: | 71 | | Under 6 years only: | 12 | | Under 6 years and 6 to 17 years: | 7 | | 6 to 17 years only: | 52 | | Female led householder: | 10 | | Under 6 years only: | 0 | | Under 6 years and 6 to 17 years: | 1 | | 6 to 17 years only: | 9 | | Households with no people under 18 years: | 11,395 | | Family households: | 6,361 | | Husband-wife family: | 5,492 | | Other family: | 869 | | Male led with no wife present: | 320 | | Female led with no husband present: | 549 | | Nonfamily households: | 5,034 | | Male led householder: | 2,643 | | Female led householder: | 2,391 |
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| Total number led homes in Grundy County, by type | | | Total Home Population: | 18,546 | | Population of Family homes: | 13,431 | | Population of 15 to 24 year olds: | 264 | | Population of 25 to 34 year olds: | 2,266 | | Population of 35 to 44 year olds: | 3,327 | | Population of 45 to 54 year olds: | 3,243 | | Population of 55 to 59 year olds: | 1,325 | | Population of 60 to 64 year olds: | 997 | | Population of 65 to 74 year olds: | 1,293 | | Population of 75 to 84 year olds: | 560 | | Population of 85 year olds and over: | 156 | | Population of Nonfamily Homes: | 5,115 | | Population of 15 to 24 year olds: | 265 | | Population of 25 to 34 year olds: | 829 | | Population of 35 to 44 year olds: | 636 | | Population of 45 to 54 year olds: | 933 | | Population of 55 to 59 year olds: | 424 | | Population of 60 to 64 year olds: | 434 | | Population of 65 to 74 year olds: | 643 | | Population of 75 to 84 year olds: | 588 | | Population of 85 year olds and over: | 363 |
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| households in Grundy County containing people over 60 | | | Total Population: | 18,546 | | Population of homes with one or more people 60 years and over: | 5,488 | | 1-person household: | 1,890 | | 2-or-more-person household: | 3,598 | | Family households: | 3,437 | | Nonfamily households: | 161 | | Population of homes with no people 60 years and over: | 13,058 | | 1-person household: | 2,284 | | 2-or-more-person household: | 10,774 | | Family homes: | 9,994 | | Nonfamily homes: | 780 |
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| homes in Grundy County with multiple generations. | | | Total Population: | 18,546 | | Home has three or more generations: | 621 | | Home does not have three or more generations: | 17,925 |
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| Unmarried population in Grundy County under 18 years old in homes | | | Total Population: | 13,651 | | Unmarried partner of home lead present: | 1,064 | | In family homes: | 976 | | Population of male led and male partner homes: | 12 | | Population of male led and female partner households: | 529 | | Population of female led and female partner households: | 45 | | Population of female led and male partner households: | 390 | | In nonfamily homes: | 88 | | Population of male led and male partner homes: | 1 | | Population of male led and female partner homes: | 81 | | Population of female led and female partner homes: | 1 | | Population of female led and male partner homes: | 5 | | No unmarried partner of home lead present: | 12,587 | | In family homes: | 12,555 | | Population of husband-wife family homes: | 10,385 | | Population of male lead with no wife present, family homes: | 484 | | Population of female lead with no husband present, family homes: | 1,686 | | In nonfamily homes: | 32 |
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| Population in families living in Grundy County | | | Total Population: | 42,467 | | Population Under 18 years: | 13,412 | | Population 18 years and over: | 29,055 |
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| How long in Grundy County have lived in one place. | | | Total: | 18,546 | | Population of Owner occupied homes: | 13,930 | | Family home: | 10,972 | | Nonfamily homess: | 2,958 | | Male led home: | 1,553 | | Living alone: | 1,220 | | Not living alone: | 333 | | Female led home: | 1,405 | | Living alone: | 1,217 | | Not living alone: | 188 | | Population of Renter occupied homes: | 4,616 | | Family run homes: | 2,459 | | Husband-wife family: | 1,282 | | Other family: | 1,177 | | Male led with no wife present: | 378 | | Female led with no husband present: | 799 | | Nonfamily Homes: | 2,157 | | Male led homes: | 1,161 | | Male living alone: | 890 | | Male not living alone: | 271 | | Female led homes: | 996 | | Females living alone: | 847 | | Females not living alone: | 149 |
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