Population Demographics for Marshall County, Iowa in 2020, 2019
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| | Male | Female | Total | | Total Population | 20,428 | 20,220 | 40,648 | | White | 17,938 | 18,133 | 36,071 | | Hispanic or Latino | 3,680 | 3,337 | 7,017 | | Some Other Race | 1,223 | 1,073 | 2,296 | | Two or More Races | 447 | 383 | 830 | | Black or African American | 419 | 260 | 679 | | Asian | 280 | 256 | 536 | | American Indian | 94 | 92 | 186 |
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| Total population in Marshall County | | | Total Population: | 40,648 | | Male Population: | 20,428 | | Female Population: | 20,220 |
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| Median age in Marshall County | | | Both sexes | 40 | | Male | 38 | | Female | 41 |
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| Population in households in Marshall County | | | Total Population: | 39,273 | | Male Population: | 19,503 | | Under 5 years: | 1,497 | | 5 to 9 years: | 1,428 | | 10 to 14 years: | 1,473 | | 15 to 17 years: | 943 | | 18 and 19 years: | 498 | | 20 years: | 258 | | 21 years: | 211 | | 22 to 24 years: | 683 | | 25 to 29 years: | 1,203 | | 30 to 34 years: | 1,114 | | 35 to 39 years: | 1,078 | | 40 to 44 years: | 1,182 | | 45 to 49 years: | 1,342 | | 50 to 54 years: | 1,408 | | 55 to 59 years: | 1,405 | | 60 and 61 years: | 503 | | 62 to 64 years: | 665 | | 65 and 66 years: | 378 | | 67 to 69 years: | 470 | | 70 to 74 years: | 634 | | 75 to 79 years: | 460 | | 80 to 84 years: | 366 | | 85 years and over: | 304 | | Female Population: | 19,770 | | Under 5 years: | 1,369 | | 5 to 9 years: | 1,369 | | 10 to 14 years: | 1,341 | | 15 to 17 years: | 865 | | 18 and 19 years: | 510 | | 20 years: | 198 | | 21 years: | 184 | | 22 to 24 years: | 660 | | 25 to 29 years: | 1,131 | | 30 to 34 years: | 1,113 | | 35 to 39 years: | 1,107 | | 40 to 44 years: | 1,147 | | 45 to 49 years: | 1,361 | | 50 to 54 years: | 1,514 | | 55 to 59 years: | 1,386 | | 60 and 61 years: | 484 | | 62 to 64 years: | 689 | | 65 and 66 years: | 372 | | 67 to 69 years: | 524 | | 70 to 74 years: | 711 | | 75 to 79 years: | 626 | | 80 to 84 years: | 549 | | 85 years and over: | 560 |
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| Average household size in Marshall County | | | Total: | 3 | | Under 18 years: | 1 | | 18 years and over: | 2 |
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| Number of occupied homes in Marshall County | | | Total: | 15,538 | | Family led homes: | 10,452 | | Husband-wife family: | 8,096 | | Other family: | 2,356 | | Population of male led with no wife present: | 763 | | Population female led with no husband present: | 1,593 | | Population of Nonfamily homes: | 5,086 | | Population living alone: | 4,218 | | Population not living alone: | 868 |
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| Total occupied homes in Marshall County with people under 18 years old: | | | Total: | 15,538 | | Population of homes with one or more people under 18 years: | 5,013 | | Population of family homes: | 4,949 | | Husband-wife family: | 3,287 | | Under 6 years only: | 693 | | Under 6 years and 6 to 17 years: | 875 | | 6 to 17 years only: | 1,719 | | Other family: | 1,662 | | Male householder, no wife present: | 507 | | Under 6 years only: | 143 | | Under 6 years and 6 to 17 years: | 114 | | 6 to 17 years only: | 250 | | Female led with no husband present: | 1,155 | | Under 6 years only: | 276 | | Under 6 years and 6 to 17 years: | 287 | | 6 to 17 years only: | 592 | | Nonfamily households: | 64 | | Male led households: | 49 | | Under 6 years only: | 14 | | Under 6 years and 6 to 17 years: | 5 | | 6 to 17 years only: | 30 | | Female led householder: | 15 | | Under 6 years only: | 3 | | Under 6 years and 6 to 17 years: | 0 | | 6 to 17 years only: | 12 | | Households with no people under 18 years: | 10,525 | | Family households: | 5,503 | | Husband-wife family: | 4,809 | | Other family: | 694 | | Male led with no wife present: | 256 | | Female led with no husband present: | 438 | | Nonfamily households: | 5,022 | | Male led householder: | 2,343 | | Female led householder: | 2,679 |
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| Total number led homes in Marshall County, by type | | | Total Home Population: | 15,538 | | Population of Family homes: | 10,452 | | Population of 15 to 24 year olds: | 408 | | Population of 25 to 34 year olds: | 1,611 | | Population of 35 to 44 year olds: | 1,962 | | Population of 45 to 54 year olds: | 2,226 | | Population of 55 to 59 year olds: | 1,109 | | Population of 60 to 64 year olds: | 948 | | Population of 65 to 74 year olds: | 1,242 | | Population of 75 to 84 year olds: | 741 | | Population of 85 year olds and over: | 205 | | Population of Nonfamily Homes: | 5,086 | | Population of 15 to 24 year olds: | 338 | | Population of 25 to 34 year olds: | 563 | | Population of 35 to 44 year olds: | 464 | | Population of 45 to 54 year olds: | 883 | | Population of 55 to 59 year olds: | 535 | | Population of 60 to 64 year olds: | 446 | | Population of 65 to 74 year olds: | 673 | | Population of 75 to 84 year olds: | 672 | | Population of 85 year olds and over: | 512 |
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| households in Marshall County containing people over 60 | | | Total Population: | 15,538 | | Population of homes with one or more people 60 years and over: | 5,793 | | 1-person household: | 2,174 | | 2-or-more-person household: | 3,619 | | Family households: | 3,451 | | Nonfamily households: | 168 | | Population of homes with no people 60 years and over: | 9,745 | | 1-person household: | 2,044 | | 2-or-more-person household: | 7,701 | | Family homes: | 7,001 | | Nonfamily homes: | 700 |
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| homes in Marshall County with multiple generations. | | | Total Population: | 15,538 | | Home has three or more generations: | 488 | | Home does not have three or more generations: | 15,050 |
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| Unmarried population in Marshall County under 18 years old in homes | | | Total Population: | 10,271 | | Unmarried partner of home lead present: | 1,031 | | In family homes: | 966 | | Population of male led and male partner homes: | 17 | | Population of male led and female partner households: | 464 | | Population of female led and female partner households: | 33 | | Population of female led and male partner households: | 452 | | In nonfamily homes: | 65 | | Population of male led and male partner homes: | 2 | | Population of male led and female partner homes: | 57 | | Population of female led and female partner homes: | 0 | | Population of female led and male partner homes: | 6 | | No unmarried partner of home lead present: | 9,240 | | In family homes: | 9,212 | | Population of husband-wife family homes: | 6,963 | | Population of male lead with no wife present, family homes: | 489 | | Population of female lead with no husband present, family homes: | 1,760 | | In nonfamily homes: | 28 |
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| Population in families living in Marshall County | | | Total Population: | 32,109 | | Population Under 18 years: | 10,048 | | Population 18 years and over: | 22,061 |
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| How long in Marshall County have lived in one place. | | | Total: | 15,538 | | Population of Owner occupied homes: | 11,393 | | Family home: | 8,434 | | Nonfamily homess: | 2,959 | | Male led home: | 1,327 | | Living alone: | 1,060 | | Not living alone: | 267 | | Female led home: | 1,632 | | Living alone: | 1,457 | | Not living alone: | 175 | | Population of Renter occupied homes: | 4,145 | | Family run homes: | 2,018 | | Husband-wife family: | 968 | | Other family: | 1,050 | | Male led with no wife present: | 311 | | Female led with no husband present: | 739 | | Nonfamily Homes: | 2,127 | | Male led homes: | 1,065 | | Male living alone: | 800 | | Male not living alone: | 265 | | Female led homes: | 1,062 | | Females living alone: | 901 | | Females not living alone: | 161 |
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