Population Demographics for Seaford, New York in 2020, 2019
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| Total population in Seaford | | Total Population: | 15,294 | Male Population: | 7,445 | Female Population: | 7,849 |
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| Median age in Seaford | | Both sexes | 42 | Male | 42 | Female | 43 |
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| Population in households in Seaford | | Total Population: | 15,240 | Male Population: | 7,413 | Under 5 years: | 391 | 5 to 9 years: | 493 | 10 to 14 years: | 574 | 15 to 17 years: | 375 | 18 and 19 years: | 154 | 20 years: | 74 | 21 years: | 79 | 22 to 24 years: | 224 | 25 to 29 years: | 395 | 30 to 34 years: | 353 | 35 to 39 years: | 443 | 40 to 44 years: | 589 | 45 to 49 years: | 660 | 50 to 54 years: | 680 | 55 to 59 years: | 552 | 60 and 61 years: | 171 | 62 to 64 years: | 261 | 65 and 66 years: | 116 | 67 to 69 years: | 155 | 70 to 74 years: | 215 | 75 to 79 years: | 177 | 80 to 84 years: | 158 | 85 years and over: | 124 | Female Population: | 7,827 | Under 5 years: | 411 | 5 to 9 years: | 434 | 10 to 14 years: | 575 | 15 to 17 years: | 316 | 18 and 19 years: | 190 | 20 years: | 91 | 21 years: | 61 | 22 to 24 years: | 249 | 25 to 29 years: | 359 | 30 to 34 years: | 357 | 35 to 39 years: | 455 | 40 to 44 years: | 655 | 45 to 49 years: | 707 | 50 to 54 years: | 692 | 55 to 59 years: | 585 | 60 and 61 years: | 159 | 62 to 64 years: | 266 | 65 and 66 years: | 149 | 67 to 69 years: | 174 | 70 to 74 years: | 261 | 75 to 79 years: | 246 | 80 to 84 years: | 217 | 85 years and over: | 218 |
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| Average household size in Seaford | | Total: | 3 | Under 18 years: | 1 | 18 years and over: | 2 |
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| Number of occupied homes in Seaford | | Total: | 5,266 | Family led homes: | 4,140 | Husband-wife family: | 3,429 | Other family: | 711 | Population of male led with no wife present: | 183 | Population female led with no husband present: | 528 | Population of Nonfamily homes: | 1,126 | Population living alone: | 913 | Population not living alone: | 213 |
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| Total occupied homes in Seaford with people under 18 years old: | | Total: | 5,266 | Population of homes with one or more people under 18 years: | 1,969 | Population of family homes: | 1,952 | Husband-wife family: | 1,670 | Under 6 years only: | 381 | Under 6 years and 6 to 17 years: | 253 | 6 to 17 years only: | 1,036 | Other family: | 282 | Male householder, no wife present: | 59 | Under 6 years only: | 12 | Under 6 years and 6 to 17 years: | 7 | 6 to 17 years only: | 40 | Female led with no husband present: | 223 | Under 6 years only: | 36 | Under 6 years and 6 to 17 years: | 12 | 6 to 17 years only: | 175 | Nonfamily households: | 17 | Male led households: | 13 | Under 6 years only: | 0 | Under 6 years and 6 to 17 years: | 0 | 6 to 17 years only: | 13 | Female led householder: | 4 | Under 6 years only: | 1 | Under 6 years and 6 to 17 years: | 1 | 6 to 17 years only: | 2 | Households with no people under 18 years: | 3,297 | Family households: | 2,188 | Husband-wife family: | 1,759 | Other family: | 429 | Male led with no wife present: | 124 | Female led with no husband present: | 305 | Nonfamily households: | 1,109 | Male led householder: | 486 | Female led householder: | 623 |
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| Total number led homes in Seaford, by type | | Total Home Population: | 5,266 | Population of Family homes: | 4,140 | Population of 15 to 24 year olds: | 13 | Population of 25 to 34 year olds: | 270 | Population of 35 to 44 year olds: | 872 | Population of 45 to 54 year olds: | 1,201 | Population of 55 to 59 year olds: | 513 | Population of 60 to 64 year olds: | 389 | Population of 65 to 74 year olds: | 460 | Population of 75 to 84 year olds: | 315 | Population of 85 year olds and over: | 107 | Population of Nonfamily Homes: | 1,126 | Population of 15 to 24 year olds: | 6 | Population of 25 to 34 year olds: | 97 | Population of 35 to 44 year olds: | 108 | Population of 45 to 54 year olds: | 212 | Population of 55 to 59 year olds: | 109 | Population of 60 to 64 year olds: | 103 | Population of 65 to 74 year olds: | 151 | Population of 75 to 84 year olds: | 209 | Population of 85 year olds and over: | 131 |
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| households in Seaford containing people over 60 | | Total Population: | 5,266 | Population of homes with one or more people 60 years and over: | 2,101 | 1-person household: | 546 | 2-or-more-person household: | 1,555 | Family households: | 1,497 | Nonfamily households: | 58 | Population of homes with no people 60 years and over: | 3,165 | 1-person household: | 367 | 2-or-more-person household: | 2,798 | Family homes: | 2,643 | Nonfamily homes: | 155 |
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| homes in Seaford with multiple generations. | | Total Population: | 5,266 | Home has three or more generations: | 250 | Home does not have three or more generations: | 5,016 |
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| Unmarried population in Seaford under 18 years old in homes | | Total Population: | 3,568 | Unmarried partner of home lead present: | 86 | In family homes: | 74 | Population of male led and male partner homes: | 10 | Population of male led and female partner households: | 23 | Population of female led and female partner households: | 12 | Population of female led and male partner households: | 29 | In nonfamily homes: | 12 | Population of male led and male partner homes: | 0 | Population of male led and female partner homes: | 12 | 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: | 3,482 | In family homes: | 3,471 | Population of husband-wife family homes: | 3,091 | Population of male lead with no wife present, family homes: | 71 | Population of female lead with no husband present, family homes: | 309 | In nonfamily homes: | 11 |
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| Population in families living in Seaford | | Total Population: | 13,652 | Population Under 18 years: | 3,537 | Population 18 years and over: | 10,115 |
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| How long in Seaford have lived in one place. | | Total: | 5,266 | Population of Owner occupied homes: | 4,708 | Family home: | 3,856 | Nonfamily homess: | 852 | Male led home: | 346 | Living alone: | 276 | Not living alone: | 70 | Female led home: | 506 | Living alone: | 428 | Not living alone: | 78 | Population of Renter occupied homes: | 558 | Family run homes: | 284 | Husband-wife family: | 151 | Other family: | 133 | Male led with no wife present: | 28 | Female led with no husband present: | 105 | Nonfamily Homes: | 274 | Male led homes: | 153 | Male living alone: | 112 | Male not living alone: | 41 | Female led homes: | 121 | Females living alone: | 97 | Females not living alone: | 24 |
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