Population Demographics for Plymouth County, Iowa in 2020, 2019
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| Total population in Plymouth County | | | Total Population: | 24,986 | | Male Population: | 12,373 | | Female Population: | 12,613 |
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| Median age in Plymouth County | | | Both sexes | 41 | | Male | 40 | | Female | 42 |
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| Population in households in Plymouth County | | | Total Population: | 24,637 | | Male Population: | 12,263 | | Under 5 years: | 847 | | 5 to 9 years: | 913 | | 10 to 14 years: | 971 | | 15 to 17 years: | 608 | | 18 and 19 years: | 287 | | 20 years: | 100 | | 21 years: | 100 | | 22 to 24 years: | 298 | | 25 to 29 years: | 668 | | 30 to 34 years: | 680 | | 35 to 39 years: | 694 | | 40 to 44 years: | 817 | | 45 to 49 years: | 907 | | 50 to 54 years: | 1,034 | | 55 to 59 years: | 930 | | 60 and 61 years: | 284 | | 62 to 64 years: | 385 | | 65 and 66 years: | 241 | | 67 to 69 years: | 304 | | 70 to 74 years: | 380 | | 75 to 79 years: | 360 | | 80 to 84 years: | 272 | | 85 years and over: | 183 | | Female Population: | 12,374 | | Under 5 years: | 805 | | 5 to 9 years: | 821 | | 10 to 14 years: | 917 | | 15 to 17 years: | 602 | | 18 and 19 years: | 280 | | 20 years: | 95 | | 21 years: | 77 | | 22 to 24 years: | 324 | | 25 to 29 years: | 624 | | 30 to 34 years: | 697 | | 35 to 39 years: | 690 | | 40 to 44 years: | 745 | | 45 to 49 years: | 968 | | 50 to 54 years: | 1,020 | | 55 to 59 years: | 887 | | 60 and 61 years: | 302 | | 62 to 64 years: | 376 | | 65 and 66 years: | 227 | | 67 to 69 years: | 333 | | 70 to 74 years: | 434 | | 75 to 79 years: | 448 | | 80 to 84 years: | 362 | | 85 years and over: | 340 |
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| Average household size in Plymouth County | | | Total: | 2 | | Under 18 years: | 1 | | 18 years and over: | 2 |
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| Number of occupied homes in Plymouth County | | | Total: | 9,875 | | Family led homes: | 6,953 | | Husband-wife family: | 5,893 | | Other family: | 1,060 | | Population of male led with no wife present: | 407 | | Population female led with no husband present: | 653 | | Population of Nonfamily homes: | 2,922 | | Population living alone: | 2,550 | | Population not living alone: | 372 |
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| Total occupied homes in Plymouth County with people under 18 years old: | | | Total: | 9,875 | | Population of homes with one or more people under 18 years: | 3,207 | | Population of family homes: | 3,171 | | Husband-wife family: | 2,435 | | Under 6 years only: | 484 | | Under 6 years and 6 to 17 years: | 571 | | 6 to 17 years only: | 1,380 | | Other family: | 736 | | Male householder, no wife present: | 277 | | Under 6 years only: | 79 | | Under 6 years and 6 to 17 years: | 52 | | 6 to 17 years only: | 146 | | Female led with no husband present: | 459 | | Under 6 years only: | 108 | | Under 6 years and 6 to 17 years: | 84 | | 6 to 17 years only: | 267 | | Nonfamily households: | 36 | | Male led households: | 30 | | Under 6 years only: | 8 | | Under 6 years and 6 to 17 years: | 4 | | 6 to 17 years only: | 18 | | Female led householder: | 6 | | Under 6 years only: | 1 | | Under 6 years and 6 to 17 years: | 1 | | 6 to 17 years only: | 4 | | Households with no people under 18 years: | 6,668 | | Family households: | 3,782 | | Husband-wife family: | 3,458 | | Other family: | 324 | | Male led with no wife present: | 130 | | Female led with no husband present: | 194 | | Nonfamily households: | 2,886 | | Male led householder: | 1,341 | | Female led householder: | 1,545 |
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| Total number led homes in Plymouth County, by type | | | Total Home Population: | 9,875 | | Population of Family homes: | 6,953 | | Population of 15 to 24 year olds: | 144 | | Population of 25 to 34 year olds: | 987 | | Population of 35 to 44 year olds: | 1,357 | | Population of 45 to 54 year olds: | 1,684 | | Population of 55 to 59 year olds: | 757 | | Population of 60 to 64 year olds: | 567 | | Population of 65 to 74 year olds: | 792 | | Population of 75 to 84 year olds: | 523 | | Population of 85 year olds and over: | 142 | | Population of Nonfamily Homes: | 2,922 | | Population of 15 to 24 year olds: | 162 | | Population of 25 to 34 year olds: | 332 | | Population of 35 to 44 year olds: | 251 | | Population of 45 to 54 year olds: | 478 | | Population of 55 to 59 year olds: | 288 | | Population of 60 to 64 year olds: | 226 | | Population of 65 to 74 year olds: | 381 | | Population of 75 to 84 year olds: | 499 | | Population of 85 year olds and over: | 305 |
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| households in Plymouth County containing people over 60 | | | Total Population: | 9,875 | | Population of homes with one or more people 60 years and over: | 3,582 | | 1-person household: | 1,365 | | 2-or-more-person household: | 2,217 | | Family households: | 2,161 | | Nonfamily households: | 56 | | Population of homes with no people 60 years and over: | 6,293 | | 1-person household: | 1,185 | | 2-or-more-person household: | 5,108 | | Family homes: | 4,792 | | Nonfamily homes: | 316 |
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| homes in Plymouth County with multiple generations. | | | Total Population: | 9,875 | | Home has three or more generations: | 151 | | Home does not have three or more generations: | 9,724 |
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| Unmarried population in Plymouth County under 18 years old in homes | | | Total Population: | 6,483 | | Unmarried partner of home lead present: | 429 | | In family homes: | 388 | | Population of male led and male partner homes: | 14 | | Population of male led and female partner households: | 237 | | Population of female led and female partner households: | 5 | | Population of female led and male partner households: | 132 | | In nonfamily homes: | 41 | | Population of male led and male partner homes: | 0 | | Population of male led and female partner homes: | 38 | | Population of female led and female partner homes: | 0 | | Population of female led and male partner homes: | 3 | | No unmarried partner of home lead present: | 6,054 | | In family homes: | 6,040 | | Population of husband-wife family homes: | 5,120 | | Population of male lead with no wife present, family homes: | 227 | | Population of female lead with no husband present, family homes: | 693 | | In nonfamily homes: | 14 |
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| Population in families living in Plymouth County | | | Total Population: | 20,855 | | Population Under 18 years: | 6,367 | | Population 18 years and over: | 14,488 |
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| How long in Plymouth County have lived in one place. | | | Total: | 9,875 | | Population of Owner occupied homes: | 7,699 | | Family home: | 5,929 | | Nonfamily homess: | 1,770 | | Male led home: | 800 | | Living alone: | 669 | | Not living alone: | 131 | | Female led home: | 970 | | Living alone: | 886 | | Not living alone: | 84 | | Population of Renter occupied homes: | 2,176 | | Family run homes: | 1,024 | | Husband-wife family: | 600 | | Other family: | 424 | | Male led with no wife present: | 137 | | Female led with no husband present: | 287 | | Nonfamily Homes: | 1,152 | | Male led homes: | 571 | | Male living alone: | 470 | | Male not living alone: | 101 | | Female led homes: | 581 | | Females living alone: | 525 | | Females not living alone: | 56 |
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