Population Demographics for Delaware County, Iowa in 2020, 2019
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| Total population in Delaware County | | Total Population: | 17,764 | Male Population: | 8,875 | Female Population: | 8,889 |
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| Median age in Delaware County | | Both sexes | 42 | Male | 41 | Female | 43 |
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| Population in households in Delaware County | | Total Population: | 17,546 | Male Population: | 8,796 | Under 5 years: | 599 | 5 to 9 years: | 617 | 10 to 14 years: | 614 | 15 to 17 years: | 442 | 18 and 19 years: | 198 | 20 years: | 75 | 21 years: | 74 | 22 to 24 years: | 236 | 25 to 29 years: | 471 | 30 to 34 years: | 483 | 35 to 39 years: | 488 | 40 to 44 years: | 563 | 45 to 49 years: | 731 | 50 to 54 years: | 797 | 55 to 59 years: | 648 | 60 and 61 years: | 236 | 62 to 64 years: | 259 | 65 and 66 years: | 139 | 67 to 69 years: | 224 | 70 to 74 years: | 344 | 75 to 79 years: | 235 | 80 to 84 years: | 188 | 85 years and over: | 135 | Female Population: | 8,750 | Under 5 years: | 541 | 5 to 9 years: | 589 | 10 to 14 years: | 646 | 15 to 17 years: | 435 | 18 and 19 years: | 190 | 20 years: | 64 | 21 years: | 58 | 22 to 24 years: | 232 | 25 to 29 years: | 436 | 30 to 34 years: | 467 | 35 to 39 years: | 474 | 40 to 44 years: | 543 | 45 to 49 years: | 776 | 50 to 54 years: | 726 | 55 to 59 years: | 602 | 60 and 61 years: | 205 | 62 to 64 years: | 257 | 65 and 66 years: | 152 | 67 to 69 years: | 234 | 70 to 74 years: | 349 | 75 to 79 years: | 302 | 80 to 84 years: | 253 | 85 years and over: | 219 |
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| Average household size in Delaware County | | Total: | 2 | Under 18 years: | 1 | 18 years and over: | 2 |
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| Number of occupied homes in Delaware County | | Total: | 7,062 | Family led homes: | 4,984 | Husband-wife family: | 4,240 | Other family: | 744 | Population of male led with no wife present: | 263 | Population female led with no husband present: | 481 | Population of Nonfamily homes: | 2,078 | Population living alone: | 1,761 | Population not living alone: | 317 |
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| Total occupied homes in Delaware County with people under 18 years old: | | Total: | 7,062 | Population of homes with one or more people under 18 years: | 2,237 | Population of family homes: | 2,202 | Husband-wife family: | 1,710 | Under 6 years only: | 345 | Under 6 years and 6 to 17 years: | 391 | 6 to 17 years only: | 974 | Other family: | 492 | Male householder, no wife present: | 162 | Under 6 years only: | 50 | Under 6 years and 6 to 17 years: | 29 | 6 to 17 years only: | 83 | Female led with no husband present: | 330 | Under 6 years only: | 71 | Under 6 years and 6 to 17 years: | 69 | 6 to 17 years only: | 190 | Nonfamily households: | 35 | Male led households: | 26 | Under 6 years only: | 8 | Under 6 years and 6 to 17 years: | 2 | 6 to 17 years only: | 16 | Female led householder: | 9 | Under 6 years only: | 5 | Under 6 years and 6 to 17 years: | 0 | 6 to 17 years only: | 4 | Households with no people under 18 years: | 4,825 | Family households: | 2,782 | Husband-wife family: | 2,530 | Other family: | 252 | Male led with no wife present: | 101 | Female led with no husband present: | 151 | Nonfamily households: | 2,043 | Male led householder: | 1,018 | Female led householder: | 1,025 |
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| Total number led homes in Delaware County, by type | | Total Home Population: | 7,062 | Population of Family homes: | 4,984 | Population of 15 to 24 year olds: | 100 | Population of 25 to 34 year olds: | 649 | Population of 35 to 44 year olds: | 924 | Population of 45 to 54 year olds: | 1,295 | Population of 55 to 59 year olds: | 541 | Population of 60 to 64 year olds: | 407 | Population of 65 to 74 year olds: | 626 | Population of 75 to 84 year olds: | 352 | Population of 85 year olds and over: | 90 | Population of Nonfamily Homes: | 2,078 | Population of 15 to 24 year olds: | 142 | Population of 25 to 34 year olds: | 235 | Population of 35 to 44 year olds: | 194 | Population of 45 to 54 year olds: | 357 | Population of 55 to 59 year olds: | 175 | Population of 60 to 64 year olds: | 147 | Population of 65 to 74 year olds: | 261 | Population of 75 to 84 year olds: | 354 | Population of 85 year olds and over: | 213 |
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| households in Delaware County containing people over 60 | | Total Population: | 7,062 | Population of homes with one or more people 60 years and over: | 2,550 | 1-person household: | 934 | 2-or-more-person household: | 1,616 | Family households: | 1,566 | Nonfamily households: | 50 | Population of homes with no people 60 years and over: | 4,512 | 1-person household: | 827 | 2-or-more-person household: | 3,685 | Family homes: | 3,418 | Nonfamily homes: | 267 |
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| homes in Delaware County with multiple generations. | | Total Population: | 7,062 | Home has three or more generations: | 83 | Home does not have three or more generations: | 6,979 |
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| Unmarried population in Delaware County under 18 years old in homes | | Total Population: | 4,481 | Unmarried partner of home lead present: | 338 | In family homes: | 304 | Population of male led and male partner homes: | 7 | Population of male led and female partner households: | 137 | Population of female led and female partner households: | 12 | Population of female led and male partner households: | 148 | In nonfamily homes: | 34 | Population of male led and male partner homes: | 0 | Population of male led and female partner homes: | 31 | 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: | 4,143 | In family homes: | 4,128 | Population of husband-wife family homes: | 3,534 | Population of male lead with no wife present, family homes: | 137 | Population of female lead with no husband present, family homes: | 457 | In nonfamily homes: | 15 |
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| Population in families living in Delaware County | | Total Population: | 14,788 | Population Under 18 years: | 4,381 | Population 18 years and over: | 10,407 |
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| How long in Delaware County have lived in one place. | | Total: | 7,062 | Population of Owner occupied homes: | 5,634 | Family home: | 4,321 | Nonfamily homess: | 1,313 | Male led home: | 648 | Living alone: | 527 | Not living alone: | 121 | Female led home: | 665 | Living alone: | 597 | Not living alone: | 68 | Population of Renter occupied homes: | 1,428 | Family run homes: | 663 | Husband-wife family: | 384 | Other family: | 279 | Male led with no wife present: | 74 | Female led with no husband present: | 205 | Nonfamily Homes: | 765 | Male led homes: | 396 | Male living alone: | 318 | Male not living alone: | 78 | Female led homes: | 369 | Females living alone: | 319 | Females not living alone: | 50 |
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