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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