Population Demographics for West Islip, New York in 2020, 2019
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| Total population in West Islip | | | Total Population: | 28,335 | | Male Population: | 13,895 | | Female Population: | 14,440 |
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| Median age in West Islip | | | Both sexes | 41 | | Male | 40 | | Female | 43 |
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| Population in households in West Islip | | | Total Population: | 27,919 | | Male Population: | 13,800 | | Under 5 years: | 797 | | 5 to 9 years: | 1,012 | | 10 to 14 years: | 1,147 | | 15 to 17 years: | 814 | | 18 and 19 years: | 384 | | 20 years: | 179 | | 21 years: | 142 | | 22 to 24 years: | 468 | | 25 to 29 years: | 554 | | 30 to 34 years: | 614 | | 35 to 39 years: | 861 | | 40 to 44 years: | 1,099 | | 45 to 49 years: | 1,327 | | 50 to 54 years: | 1,300 | | 55 to 59 years: | 894 | | 60 and 61 years: | 292 | | 62 to 64 years: | 350 | | 65 and 66 years: | 245 | | 67 to 69 years: | 295 | | 70 to 74 years: | 364 | | 75 to 79 years: | 295 | | 80 to 84 years: | 235 | | 85 years and over: | 132 | | Female Population: | 14,119 | | Under 5 years: | 722 | | 5 to 9 years: | 926 | | 10 to 14 years: | 1,095 | | 15 to 17 years: | 729 | | 18 and 19 years: | 302 | | 20 years: | 132 | | 21 years: | 159 | | 22 to 24 years: | 476 | | 25 to 29 years: | 566 | | 30 to 34 years: | 628 | | 35 to 39 years: | 887 | | 40 to 44 years: | 1,217 | | 45 to 49 years: | 1,425 | | 50 to 54 years: | 1,278 | | 55 to 59 years: | 868 | | 60 and 61 years: | 282 | | 62 to 64 years: | 435 | | 65 and 66 years: | 257 | | 67 to 69 years: | 335 | | 70 to 74 years: | 453 | | 75 to 79 years: | 384 | | 80 to 84 years: | 296 | | 85 years and over: | 267 |
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| Average household size in West Islip | | | Total: | 3 | | Under 18 years: | 1 | | 18 years and over: | 2 |
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| Number of occupied homes in West Islip | | | Total: | 9,040 | | Family led homes: | 7,459 | | Husband-wife family: | 6,168 | | Other family: | 1,291 | | Population of male led with no wife present: | 356 | | Population female led with no husband present: | 935 | | Population of Nonfamily homes: | 1,581 | | Population living alone: | 1,299 | | Population not living alone: | 282 |
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| Total occupied homes in West Islip with people under 18 years old: | | | Total: | 9,040 | | Population of homes with one or more people under 18 years: | 3,871 | | Population of family homes: | 3,850 | | Husband-wife family: | 3,253 | | Under 6 years only: | 641 | | Under 6 years and 6 to 17 years: | 566 | | 6 to 17 years only: | 2,046 | | Other family: | 597 | | Male householder, no wife present: | 149 | | Under 6 years only: | 21 | | Under 6 years and 6 to 17 years: | 17 | | 6 to 17 years only: | 111 | | Female led with no husband present: | 448 | | Under 6 years only: | 58 | | Under 6 years and 6 to 17 years: | 53 | | 6 to 17 years only: | 337 | | Nonfamily households: | 21 | | Male led households: | 15 | | Under 6 years only: | 2 | | Under 6 years and 6 to 17 years: | 1 | | 6 to 17 years only: | 12 | | Female led householder: | 6 | | Under 6 years only: | 1 | | Under 6 years and 6 to 17 years: | 0 | | 6 to 17 years only: | 5 | | Households with no people under 18 years: | 5,169 | | Family households: | 3,609 | | Husband-wife family: | 2,915 | | Other family: | 694 | | Male led with no wife present: | 207 | | Female led with no husband present: | 487 | | Nonfamily households: | 1,560 | | Male led householder: | 705 | | Female led householder: | 855 |
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| Total number led homes in West Islip, by type | | | Total Home Population: | 9,040 | | Population of Family homes: | 7,459 | | Population of 15 to 24 year olds: | 25 | | Population of 25 to 34 year olds: | 483 | | Population of 35 to 44 year olds: | 1,674 | | Population of 45 to 54 year olds: | 2,436 | | Population of 55 to 59 year olds: | 823 | | Population of 60 to 64 year olds: | 580 | | Population of 65 to 74 year olds: | 860 | | Population of 75 to 84 year olds: | 462 | | Population of 85 year olds and over: | 116 | | Population of Nonfamily Homes: | 1,581 | | Population of 15 to 24 year olds: | 24 | | Population of 25 to 34 year olds: | 161 | | Population of 35 to 44 year olds: | 172 | | Population of 45 to 54 year olds: | 244 | | Population of 55 to 59 year olds: | 148 | | Population of 60 to 64 year olds: | 157 | | Population of 65 to 74 year olds: | 254 | | Population of 75 to 84 year olds: | 302 | | Population of 85 year olds and over: | 119 |
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| households in West Islip containing people over 60 | | | Total Population: | 9,040 | | Population of homes with one or more people 60 years and over: | 3,348 | | 1-person household: | 750 | | 2-or-more-person household: | 2,598 | | Family households: | 2,502 | | Nonfamily households: | 96 | | Population of homes with no people 60 years and over: | 5,692 | | 1-person household: | 549 | | 2-or-more-person household: | 5,143 | | Family homes: | 4,957 | | Nonfamily homes: | 186 |
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| homes in West Islip with multiple generations. | | | Total Population: | 9,040 | | Home has three or more generations: | 564 | | Home does not have three or more generations: | 8,476 |
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| Unmarried population in West Islip under 18 years old in homes | | | Total Population: | 7,240 | | Unmarried partner of home lead present: | 176 | | In family homes: | 162 | | Population of male led and male partner homes: | 13 | | Population of male led and female partner households: | 51 | | Population of female led and female partner households: | 19 | | Population of female led and male partner households: | 79 | | In nonfamily homes: | 14 | | Population of male led and male partner homes: | 0 | | Population of male led and female partner homes: | 13 | | Population of female led and female partner homes: | 1 | | Population of female led and male partner homes: | 0 | | No unmarried partner of home lead present: | 7,064 | | In family homes: | 7,053 | | Population of husband-wife family homes: | 6,236 | | Population of male lead with no wife present, family homes: | 166 | | Population of female lead with no husband present, family homes: | 651 | | In nonfamily homes: | 11 |
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| Population in families living in West Islip | | | Total Population: | 25,561 | | Population Under 18 years: | 7,190 | | Population 18 years and over: | 18,371 |
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| How long in West Islip have lived in one place. | | | Total: | 9,040 | | Population of Owner occupied homes: | 8,332 | | Family home: | 7,081 | | Nonfamily homess: | 1,251 | | Male led home: | 544 | | Living alone: | 434 | | Not living alone: | 110 | | Female led home: | 707 | | Living alone: | 616 | | Not living alone: | 91 | | Population of Renter occupied homes: | 708 | | Family run homes: | 378 | | Husband-wife family: | 208 | | Other family: | 170 | | Male led with no wife present: | 48 | | Female led with no husband present: | 122 | | Nonfamily Homes: | 330 | | Male led homes: | 176 | | Male living alone: | 128 | | Male not living alone: | 48 | | Female led homes: | 154 | | Females living alone: | 121 | | Females not living alone: | 33 |
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