Population Demographics for Decatur, Illinois in 2020, 2019
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| | Male | Female | Total | Total Population | 35,642 | 40,480 | 76,122 | White | 25,418 | 29,091 | 54,509 | Black or African American | 8,256 | 9,448 | 17,704 | Two or More Races | 1,144 | 1,206 | 2,350 | Hispanic or Latino | 876 | 774 | 1,650 | Asian | 344 | 360 | 704 | Some Other Race | 377 | 282 | 659 | American Indian | 91 | 82 | 173 | Three or more races | 54 | 83 | 137 |
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| Total population in Decatur | | Total Population: | 76,122 | Male Population: | 35,642 | Female Population: | 40,480 |
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| Median age in Decatur | | Both sexes | 39 | Male | 37 | Female | 40 |
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| Population in households in Decatur | | Total Population: | 72,204 | Male Population: | 33,977 | Under 5 years: | 2,542 | 5 to 9 years: | 2,276 | 10 to 14 years: | 2,080 | 15 to 17 years: | 1,414 | 18 and 19 years: | 862 | 20 years: | 482 | 21 years: | 458 | 22 to 24 years: | 1,353 | 25 to 29 years: | 2,304 | 30 to 34 years: | 2,162 | 35 to 39 years: | 1,924 | 40 to 44 years: | 1,877 | 45 to 49 years: | 2,263 | 50 to 54 years: | 2,560 | 55 to 59 years: | 2,470 | 60 and 61 years: | 909 | 62 to 64 years: | 1,180 | 65 and 66 years: | 623 | 67 to 69 years: | 855 | 70 to 74 years: | 1,111 | 75 to 79 years: | 959 | 80 to 84 years: | 755 | 85 years and over: | 558 | Female Population: | 38,227 | Under 5 years: | 2,540 | 5 to 9 years: | 2,288 | 10 to 14 years: | 2,265 | 15 to 17 years: | 1,361 | 18 and 19 years: | 937 | 20 years: | 547 | 21 years: | 544 | 22 to 24 years: | 1,532 | 25 to 29 years: | 2,502 | 30 to 34 years: | 2,314 | 35 to 39 years: | 2,024 | 40 to 44 years: | 1,968 | 45 to 49 years: | 2,486 | 50 to 54 years: | 2,857 | 55 to 59 years: | 2,753 | 60 and 61 years: | 1,019 | 62 to 64 years: | 1,249 | 65 and 66 years: | 772 | 67 to 69 years: | 1,027 | 70 to 74 years: | 1,475 | 75 to 79 years: | 1,355 | 80 to 84 years: | 1,188 | 85 years and over: | 1,224 |
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| Average household size in Decatur | | Total: | 2 | Under 18 years: | 0 | 18 years and over: | 1 |
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| Number of occupied homes in Decatur | | Total: | 32,344 | Family led homes: | 18,991 | Husband-wife family: | 12,092 | Other family: | 6,899 | Population of male led with no wife present: | 1,434 | Population female led with no husband present: | 5,465 | Population of Nonfamily homes: | 13,353 | Population living alone: | 11,400 | Population not living alone: | 1,953 |
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| Total occupied homes in Decatur with people under 18 years old: | | Total: | 32,344 | Population of homes with one or more people under 18 years: | 8,872 | Population of family homes: | 8,732 | Husband-wife family: | 3,949 | Under 6 years only: | 990 | Under 6 years and 6 to 17 years: | 869 | 6 to 17 years only: | 2,090 | Other family: | 4,783 | Male householder, no wife present: | 853 | Under 6 years only: | 295 | Under 6 years and 6 to 17 years: | 124 | 6 to 17 years only: | 434 | Female led with no husband present: | 3,930 | Under 6 years only: | 1,072 | Under 6 years and 6 to 17 years: | 943 | 6 to 17 years only: | 1,915 | Nonfamily households: | 140 | Male led households: | 109 | Under 6 years only: | 25 | Under 6 years and 6 to 17 years: | 16 | 6 to 17 years only: | 68 | Female led householder: | 31 | Under 6 years only: | 12 | Under 6 years and 6 to 17 years: | 3 | 6 to 17 years only: | 16 | Households with no people under 18 years: | 23,472 | Family households: | 10,259 | Husband-wife family: | 8,143 | Other family: | 2,116 | Male led with no wife present: | 581 | Female led with no husband present: | 1,535 | Nonfamily households: | 13,213 | Male led householder: | 5,951 | Female led householder: | 7,262 |
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| Total number led homes in Decatur, by type | | Total Home Population: | 32,344 | Population of Family homes: | 18,991 | Population of 15 to 24 year olds: | 1,052 | Population of 25 to 34 year olds: | 3,462 | Population of 35 to 44 year olds: | 3,234 | Population of 45 to 54 year olds: | 3,595 | Population of 55 to 59 year olds: | 1,903 | Population of 60 to 64 year olds: | 1,651 | Population of 65 to 74 year olds: | 2,249 | Population of 75 to 84 year olds: | 1,456 | Population of 85 year olds and over: | 389 | Population of Nonfamily Homes: | 13,353 | Population of 15 to 24 year olds: | 1,044 | Population of 25 to 34 year olds: | 1,604 | Population of 35 to 44 year olds: | 1,313 | Population of 45 to 54 year olds: | 2,433 | Population of 55 to 59 year olds: | 1,334 | Population of 60 to 64 year olds: | 1,176 | Population of 65 to 74 year olds: | 1,654 | Population of 75 to 84 year olds: | 1,685 | Population of 85 year olds and over: | 1,110 |
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| households in Decatur containing people over 60 | | Total Population: | 32,344 | Population of homes with one or more people 60 years and over: | 12,045 | 1-person household: | 5,335 | 2-or-more-person household: | 6,710 | Family households: | 6,356 | Nonfamily households: | 354 | Population of homes with no people 60 years and over: | 20,299 | 1-person household: | 6,065 | 2-or-more-person household: | 14,234 | Family homes: | 12,635 | Nonfamily homes: | 1,599 |
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| homes in Decatur with multiple generations. | | Total Population: | 32,344 | Home has three or more generations: | 955 | Home does not have three or more generations: | 31,389 |
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| Unmarried population in Decatur under 18 years old in homes | | Total Population: | 16,752 | Unmarried partner of home lead present: | 2,099 | In family homes: | 1,967 | Population of male led and male partner homes: | 26 | Population of male led and female partner households: | 714 | Population of female led and female partner households: | 66 | Population of female led and male partner households: | 1,161 | In nonfamily homes: | 132 | Population of male led and male partner homes: | 0 | Population of male led and female partner homes: | 119 | Population of female led and female partner homes: | 4 | Population of female led and male partner homes: | 9 | No unmarried partner of home lead present: | 14,653 | In family homes: | 14,579 | Population of husband-wife family homes: | 7,612 | Population of male lead with no wife present, family homes: | 678 | Population of female lead with no husband present, family homes: | 6,289 | In nonfamily homes: | 74 |
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| Population in families living in Decatur | | Total Population: | 54,361 | Population Under 18 years: | 16,342 | Population 18 years and over: | 38,019 |
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| How long in Decatur have lived in one place. | | Total: | 32,344 | Population of Owner occupied homes: | 20,382 | Family home: | 13,310 | Nonfamily homess: | 7,072 | Male led home: | 3,075 | Living alone: | 2,535 | Not living alone: | 540 | Female led home: | 3,997 | Living alone: | 3,594 | Not living alone: | 403 | Population of Renter occupied homes: | 11,962 | Family run homes: | 5,681 | Husband-wife family: | 1,767 | Other family: | 3,914 | Male led with no wife present: | 670 | Female led with no husband present: | 3,244 | Nonfamily Homes: | 6,281 | Male led homes: | 2,985 | Male living alone: | 2,423 | Male not living alone: | 562 | Female led homes: | 3,296 | Females living alone: | 2,848 | Females not living alone: | 448 |
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