Population Demographics for Nantucket County, Massachusetts in 2020, 2019
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| Total population in Nantucket County | | | Total Population: | 10,172 | | Male Population: | 5,205 | | Female Population: | 4,967 |
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| Median age in Nantucket County | | | Both sexes | 39 | | Male | 39 | | Female | 40 |
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| Population in households in Nantucket County | | | Total Population: | 10,114 | | Male Population: | 5,182 | | Under 5 years: | 334 | | 5 to 9 years: | 294 | | 10 to 14 years: | 275 | | 15 to 17 years: | 147 | | 18 and 19 years: | 87 | | 20 years: | 42 | | 21 years: | 46 | | 22 to 24 years: | 178 | | 25 to 29 years: | 388 | | 30 to 34 years: | 453 | | 35 to 39 years: | 473 | | 40 to 44 years: | 446 | | 45 to 49 years: | 450 | | 50 to 54 years: | 376 | | 55 to 59 years: | 344 | | 60 and 61 years: | 137 | | 62 to 64 years: | 167 | | 65 and 66 years: | 91 | | 67 to 69 years: | 90 | | 70 to 74 years: | 158 | | 75 to 79 years: | 101 | | 80 to 84 years: | 58 | | 85 years and over: | 47 | | Female Population: | 4,932 | | Under 5 years: | 349 | | 5 to 9 years: | 301 | | 10 to 14 years: | 248 | | 15 to 17 years: | 157 | | 18 and 19 years: | 67 | | 20 years: | 31 | | 21 years: | 36 | | 22 to 24 years: | 145 | | 25 to 29 years: | 348 | | 30 to 34 years: | 396 | | 35 to 39 years: | 370 | | 40 to 44 years: | 395 | | 45 to 49 years: | 398 | | 50 to 54 years: | 407 | | 55 to 59 years: | 369 | | 60 and 61 years: | 120 | | 62 to 64 years: | 146 | | 65 and 66 years: | 87 | | 67 to 69 years: | 100 | | 70 to 74 years: | 164 | | 75 to 79 years: | 116 | | 80 to 84 years: | 93 | | 85 years and over: | 89 |
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| Average household size in Nantucket County | | | Total: | 2 | | Under 18 years: | 0 | | 18 years and over: | 2 |
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| Number of occupied homes in Nantucket County | | | Total: | 4,229 | | Family led homes: | 2,429 | | Husband-wife family: | 1,894 | | Other family: | 535 | | Population of male led with no wife present: | 183 | | Population female led with no husband present: | 352 | | Population of Nonfamily homes: | 1,800 | | Population living alone: | 1,257 | | Population not living alone: | 543 |
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| Total occupied homes in Nantucket County with people under 18 years old: | | | Total: | 4,229 | | Population of homes with one or more people under 18 years: | 1,213 | | Population of family homes: | 1,198 | | Husband-wife family: | 870 | | Under 6 years only: | 275 | | Under 6 years and 6 to 17 years: | 183 | | 6 to 17 years only: | 412 | | Other family: | 328 | | Male householder, no wife present: | 113 | | Under 6 years only: | 33 | | Under 6 years and 6 to 17 years: | 16 | | 6 to 17 years only: | 64 | | Female led with no husband present: | 215 | | Under 6 years only: | 67 | | Under 6 years and 6 to 17 years: | 28 | | 6 to 17 years only: | 120 | | Nonfamily households: | 15 | | Male led households: | 9 | | Under 6 years only: | 2 | | Under 6 years and 6 to 17 years: | 1 | | 6 to 17 years only: | 6 | | Female led householder: | 6 | | Under 6 years only: | 2 | | Under 6 years and 6 to 17 years: | 1 | | 6 to 17 years only: | 3 | | Households with no people under 18 years: | 3,016 | | Family households: | 1,231 | | Husband-wife family: | 1,024 | | Other family: | 207 | | Male led with no wife present: | 70 | | Female led with no husband present: | 137 | | Nonfamily households: | 1,785 | | Male led householder: | 917 | | Female led householder: | 868 |
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| Total number led homes in Nantucket County, by type | | | Total Home Population: | 4,229 | | Population of Family homes: | 2,429 | | Population of 15 to 24 year olds: | 40 | | Population of 25 to 34 year olds: | 360 | | Population of 35 to 44 year olds: | 588 | | Population of 45 to 54 year olds: | 605 | | Population of 55 to 59 year olds: | 252 | | Population of 60 to 64 year olds: | 200 | | Population of 65 to 74 year olds: | 241 | | Population of 75 to 84 year olds: | 113 | | Population of 85 year olds and over: | 30 | | Population of Nonfamily Homes: | 1,800 | | Population of 15 to 24 year olds: | 79 | | Population of 25 to 34 year olds: | 306 | | Population of 35 to 44 year olds: | 318 | | Population of 45 to 54 year olds: | 334 | | Population of 55 to 59 year olds: | 189 | | Population of 60 to 64 year olds: | 148 | | Population of 65 to 74 year olds: | 198 | | Population of 75 to 84 year olds: | 154 | | Population of 85 year olds and over: | 74 |
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| households in Nantucket County containing people over 60 | | | Total Population: | 4,229 | | Population of homes with one or more people 60 years and over: | 1,303 | | 1-person household: | 511 | | 2-or-more-person household: | 792 | | Family households: | 704 | | Nonfamily households: | 88 | | Population of homes with no people 60 years and over: | 2,926 | | 1-person household: | 746 | | 2-or-more-person household: | 2,180 | | Family homes: | 1,725 | | Nonfamily homes: | 455 |
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| homes in Nantucket County with multiple generations. | | | Total Population: | 4,229 | | Home has three or more generations: | 51 | | Home does not have three or more generations: | 4,178 |
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| Unmarried population in Nantucket County under 18 years old in homes | | | Total Population: | 2,103 | | Unmarried partner of home lead present: | 154 | | In family homes: | 146 | | Population of male led and male partner homes: | 9 | | Population of male led and female partner households: | 67 | | Population of female led and female partner households: | 2 | | Population of female led and male partner households: | 68 | | In nonfamily homes: | 8 | | Population of male led and male partner homes: | 0 | | Population of male led and female partner homes: | 7 | | Population of female led and female partner homes: | 0 | | Population of female led and male partner homes: | 1 | | No unmarried partner of home lead present: | 1,949 | | In family homes: | 1,940 | | Population of husband-wife family homes: | 1,545 | | Population of male lead with no wife present, family homes: | 103 | | Population of female lead with no husband present, family homes: | 292 | | In nonfamily homes: | 9 |
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| Population in families living in Nantucket County | | | Total Population: | 7,125 | | Population Under 18 years: | 2,070 | | Population 18 years and over: | 5,055 |
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| How long in Nantucket County have lived in one place. | | | Total: | 4,229 | | Population of Owner occupied homes: | 2,475 | | Family home: | 1,688 | | Nonfamily homess: | 787 | | Male led home: | 353 | | Living alone: | 262 | | Not living alone: | 91 | | Female led home: | 434 | | Living alone: | 354 | | Not living alone: | 80 | | Population of Renter occupied homes: | 1,754 | | Family run homes: | 741 | | Husband-wife family: | 474 | | Other family: | 267 | | Male led with no wife present: | 91 | | Female led with no husband present: | 176 | | Nonfamily Homes: | 1,013 | | Male led homes: | 573 | | Male living alone: | 332 | | Male not living alone: | 241 | | Female led homes: | 440 | | Females living alone: | 309 | | Females not living alone: | 131 |
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