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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