Population Demographics for Islip, New York in 2020, 2019
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| Total population in Islip | | | Total Population: | 18,689 | | Male Population: | 9,132 | | Female Population: | 9,557 |
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| Median age in Islip | | | Both sexes | 40 | | Male | 39 | | Female | 41 |
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| Population in households in Islip | | | Total Population: | 18,631 | | Male Population: | 9,085 | | Under 5 years: | 454 | | 5 to 9 years: | 589 | | 10 to 14 years: | 756 | | 15 to 17 years: | 451 | | 18 and 19 years: | 287 | | 20 years: | 146 | | 21 years: | 93 | | 22 to 24 years: | 335 | | 25 to 29 years: | 496 | | 30 to 34 years: | 517 | | 35 to 39 years: | 566 | | 40 to 44 years: | 740 | | 45 to 49 years: | 844 | | 50 to 54 years: | 755 | | 55 to 59 years: | 570 | | 60 and 61 years: | 214 | | 62 to 64 years: | 271 | | 65 and 66 years: | 148 | | 67 to 69 years: | 170 | | 70 to 74 years: | 254 | | 75 to 79 years: | 229 | | 80 to 84 years: | 110 | | 85 years and over: | 90 | | Female Population: | 9,546 | | Under 5 years: | 507 | | 5 to 9 years: | 581 | | 10 to 14 years: | 700 | | 15 to 17 years: | 454 | | 18 and 19 years: | 230 | | 20 years: | 114 | | 21 years: | 84 | | 22 to 24 years: | 309 | | 25 to 29 years: | 424 | | 30 to 34 years: | 565 | | 35 to 39 years: | 626 | | 40 to 44 years: | 796 | | 45 to 49 years: | 928 | | 50 to 54 years: | 792 | | 55 to 59 years: | 564 | | 60 and 61 years: | 232 | | 62 to 64 years: | 319 | | 65 and 66 years: | 161 | | 67 to 69 years: | 221 | | 70 to 74 years: | 346 | | 75 to 79 years: | 226 | | 80 to 84 years: | 189 | | 85 years and over: | 178 |
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| Average household size in Islip | | | Total: | 3 | | Under 18 years: | 1 | | 18 years and over: | 2 |
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| Number of occupied homes in Islip | | | Total: | 6,437 | | Family led homes: | 4,797 | | Husband-wife family: | 3,713 | | Other family: | 1,084 | | Population of male led with no wife present: | 300 | | Population female led with no husband present: | 784 | | Population of Nonfamily homes: | 1,640 | | Population living alone: | 1,338 | | Population not living alone: | 302 |
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| Total occupied homes in Islip with people under 18 years old: | | | Total: | 6,437 | | Population of homes with one or more people under 18 years: | 2,434 | | Population of family homes: | 2,418 | | Husband-wife family: | 1,879 | | Under 6 years only: | 359 | | Under 6 years and 6 to 17 years: | 330 | | 6 to 17 years only: | 1,190 | | Other family: | 539 | | Male householder, no wife present: | 132 | | Under 6 years only: | 21 | | Under 6 years and 6 to 17 years: | 23 | | 6 to 17 years only: | 88 | | Female led with no husband present: | 407 | | Under 6 years only: | 62 | | Under 6 years and 6 to 17 years: | 61 | | 6 to 17 years only: | 284 | | Nonfamily households: | 16 | | Male led households: | 12 | | Under 6 years only: | 2 | | Under 6 years and 6 to 17 years: | 2 | | 6 to 17 years only: | 8 | | Female led householder: | 4 | | Under 6 years only: | 2 | | Under 6 years and 6 to 17 years: | 0 | | 6 to 17 years only: | 2 | | Households with no people under 18 years: | 4,003 | | Family households: | 2,379 | | Husband-wife family: | 1,834 | | Other family: | 545 | | Male led with no wife present: | 168 | | Female led with no husband present: | 377 | | Nonfamily households: | 1,624 | | Male led householder: | 712 | | Female led householder: | 912 |
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| Total number led homes in Islip, by type | | | Total Home Population: | 6,437 | | Population of Family homes: | 4,797 | | Population of 15 to 24 year olds: | 70 | | Population of 25 to 34 year olds: | 444 | | Population of 35 to 44 year olds: | 1,086 | | Population of 45 to 54 year olds: | 1,411 | | Population of 55 to 59 year olds: | 489 | | Population of 60 to 64 year olds: | 425 | | Population of 65 to 74 year olds: | 520 | | Population of 75 to 84 year olds: | 283 | | Population of 85 year olds and over: | 69 | | Population of Nonfamily Homes: | 1,640 | | Population of 15 to 24 year olds: | 36 | | Population of 25 to 34 year olds: | 223 | | Population of 35 to 44 year olds: | 226 | | Population of 45 to 54 year olds: | 305 | | Population of 55 to 59 year olds: | 152 | | Population of 60 to 64 year olds: | 165 | | Population of 65 to 74 year olds: | 236 | | Population of 75 to 84 year olds: | 197 | | Population of 85 year olds and over: | 100 |
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| households in Islip containing people over 60 | | | Total Population: | 6,437 | | Population of homes with one or more people 60 years and over: | 2,310 | | 1-person household: | 637 | | 2-or-more-person household: | 1,673 | | Family households: | 1,598 | | Nonfamily households: | 75 | | Population of homes with no people 60 years and over: | 4,127 | | 1-person household: | 701 | | 2-or-more-person household: | 3,426 | | Family homes: | 3,199 | | Nonfamily homes: | 227 |
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| homes in Islip with multiple generations. | | | Total Population: | 6,437 | | Home has three or more generations: | 353 | | Home does not have three or more generations: | 6,084 |
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| Unmarried population in Islip under 18 years old in homes | | | Total Population: | 4,490 | | Unmarried partner of home lead present: | 235 | | In family homes: | 222 | | Population of male led and male partner homes: | 20 | | Population of male led and female partner households: | 93 | | Population of female led and female partner households: | 15 | | Population of female led and male partner households: | 94 | | In nonfamily homes: | 13 | | Population of male led and male partner homes: | 2 | | Population of male led and female partner homes: | 11 | | Population of female led and female partner homes: | 0 | | Population of female led and male partner homes: | 0 | | No unmarried partner of home lead present: | 4,255 | | In family homes: | 4,246 | | Population of husband-wife family homes: | 3,513 | | Population of male lead with no wife present, family homes: | 122 | | Population of female lead with no husband present, family homes: | 611 | | In nonfamily homes: | 9 |
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| Population in families living in Islip | | | Total Population: | 16,105 | | Population Under 18 years: | 4,415 | | Population 18 years and over: | 11,690 |
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| How long in Islip have lived in one place. | | | Total: | 6,437 | | Population of Owner occupied homes: | 5,187 | | Family home: | 4,114 | | Nonfamily homess: | 1,073 | | Male led home: | 440 | | Living alone: | 344 | | Not living alone: | 96 | | Female led home: | 633 | | Living alone: | 537 | | Not living alone: | 96 | | Population of Renter occupied homes: | 1,250 | | Family run homes: | 683 | | Husband-wife family: | 377 | | Other family: | 306 | | Male led with no wife present: | 79 | | Female led with no husband present: | 227 | | Nonfamily Homes: | 567 | | Male led homes: | 284 | | Male living alone: | 219 | | Male not living alone: | 65 | | Female led homes: | 283 | | Females living alone: | 238 | | Females not living alone: | 45 |
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