Population Demographics for Seaford, Delaware in 2020, 2019
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| Total population in Seaford | | | Total Population: | 6,928 | | Male Population: | 3,078 | | Female Population: | 3,850 |
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| Median age in Seaford | | | Both sexes | 35 | | Male | 32 | | Female | 38 |
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| Population in households in Seaford | | | Total Population: | 6,611 | | Male Population: | 2,986 | | Under 5 years: | 318 | | 5 to 9 years: | 278 | | 10 to 14 years: | 217 | | 15 to 17 years: | 136 | | 18 and 19 years: | 79 | | 20 years: | 35 | | 21 years: | 28 | | 22 to 24 years: | 138 | | 25 to 29 years: | 213 | | 30 to 34 years: | 191 | | 35 to 39 years: | 181 | | 40 to 44 years: | 186 | | 45 to 49 years: | 170 | | 50 to 54 years: | 150 | | 55 to 59 years: | 160 | | 60 and 61 years: | 69 | | 62 to 64 years: | 99 | | 65 and 66 years: | 31 | | 67 to 69 years: | 45 | | 70 to 74 years: | 76 | | 75 to 79 years: | 59 | | 80 to 84 years: | 66 | | 85 years and over: | 61 | | Female Population: | 3,625 | | Under 5 years: | 316 | | 5 to 9 years: | 277 | | 10 to 14 years: | 219 | | 15 to 17 years: | 115 | | 18 and 19 years: | 86 | | 20 years: | 42 | | 21 years: | 54 | | 22 to 24 years: | 167 | | 25 to 29 years: | 261 | | 30 to 34 years: | 260 | | 35 to 39 years: | 188 | | 40 to 44 years: | 222 | | 45 to 49 years: | 188 | | 50 to 54 years: | 191 | | 55 to 59 years: | 218 | | 60 and 61 years: | 73 | | 62 to 64 years: | 103 | | 65 and 66 years: | 53 | | 67 to 69 years: | 74 | | 70 to 74 years: | 142 | | 75 to 79 years: | 119 | | 80 to 84 years: | 104 | | 85 years and over: | 153 |
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| Average household size in Seaford | | | Total: | 2 | | Under 18 years: | 0 | | 18 years and over: | 1 |
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| Number of occupied homes in Seaford | | | Total: | 2,686 | | Family led homes: | 1,665 | | Husband-wife family: | 874 | | Other family: | 791 | | Population of male led with no wife present: | 127 | | Population female led with no husband present: | 664 | | Population of Nonfamily homes: | 1,021 | | Population living alone: | 890 | | Population not living alone: | 131 |
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| Total occupied homes in Seaford with people under 18 years old: | | | Total: | 2,686 | | Population of homes with one or more people under 18 years: | 987 | | Population of family homes: | 975 | | Husband-wife family: | 361 | | Under 6 years only: | 93 | | Under 6 years and 6 to 17 years: | 98 | | 6 to 17 years only: | 170 | | Other family: | 614 | | Male householder, no wife present: | 87 | | Under 6 years only: | 28 | | Under 6 years and 6 to 17 years: | 26 | | 6 to 17 years only: | 33 | | Female led with no husband present: | 527 | | Under 6 years only: | 163 | | Under 6 years and 6 to 17 years: | 132 | | 6 to 17 years only: | 232 | | Nonfamily households: | 12 | | Male led households: | 10 | | Under 6 years only: | 5 | | Under 6 years and 6 to 17 years: | 1 | | 6 to 17 years only: | 4 | | Female led householder: | 2 | | Under 6 years only: | 2 | | Under 6 years and 6 to 17 years: | 0 | | 6 to 17 years only: | 0 | | Households with no people under 18 years: | 1,699 | | Family households: | 690 | | Husband-wife family: | 513 | | Other family: | 177 | | Male led with no wife present: | 40 | | Female led with no husband present: | 137 | | Nonfamily households: | 1,009 | | Male led householder: | 343 | | Female led householder: | 666 |
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| Total number led homes in Seaford, by type | | | Total Home Population: | 2,686 | | Population of Family homes: | 1,665 | | Population of 15 to 24 year olds: | 148 | | Population of 25 to 34 year olds: | 370 | | Population of 35 to 44 year olds: | 330 | | Population of 45 to 54 year olds: | 274 | | Population of 55 to 59 year olds: | 140 | | Population of 60 to 64 year olds: | 121 | | Population of 65 to 74 year olds: | 138 | | Population of 75 to 84 year olds: | 107 | | Population of 85 year olds and over: | 37 | | Population of Nonfamily Homes: | 1,021 | | Population of 15 to 24 year olds: | 47 | | Population of 25 to 34 year olds: | 100 | | Population of 35 to 44 year olds: | 86 | | Population of 45 to 54 year olds: | 134 | | Population of 55 to 59 year olds: | 95 | | Population of 60 to 64 year olds: | 104 | | Population of 65 to 74 year olds: | 159 | | Population of 75 to 84 year olds: | 150 | | Population of 85 year olds and over: | 146 |
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| households in Seaford containing people over 60 | | | Total Population: | 2,686 | | Population of homes with one or more people 60 years and over: | 1,032 | | 1-person household: | 546 | | 2-or-more-person household: | 486 | | Family households: | 469 | | Nonfamily households: | 17 | | Population of homes with no people 60 years and over: | 1,654 | | 1-person household: | 344 | | 2-or-more-person household: | 1,310 | | Family homes: | 1,196 | | Nonfamily homes: | 114 |
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| homes in Seaford with multiple generations. | | | Total Population: | 2,686 | | Home has three or more generations: | 151 | | Home does not have three or more generations: | 2,535 |
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| Unmarried population in Seaford under 18 years old in homes | | | Total Population: | 1,875 | | Unmarried partner of home lead present: | 229 | | In family homes: | 220 | | Population of male led and male partner homes: | 8 | | Population of male led and female partner households: | 71 | | Population of female led and female partner households: | 10 | | Population of female led and male partner households: | 131 | | In nonfamily homes: | 9 | | Population of male led and male partner homes: | 0 | | Population of male led and female partner homes: | 8 | | Population of female led and female partner homes: | 0 | | Population of female led and male partner homes: | 1 | | No unmarried partner of home lead present: | 1,646 | | In family homes: | 1,636 | | Population of husband-wife family homes: | 719 | | Population of male lead with no wife present, family homes: | 80 | | Population of female lead with no husband present, family homes: | 837 | | In nonfamily homes: | 10 |
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| Population in families living in Seaford | | | Total Population: | 5,145 | | Population Under 18 years: | 1,840 | | Population 18 years and over: | 3,305 |
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| How long in Seaford have lived in one place. | | | Total: | 2,686 | | Population of Owner occupied homes: | 1,176 | | Family home: | 791 | | Nonfamily homess: | 385 | | Male led home: | 127 | | Living alone: | 104 | | Not living alone: | 23 | | Female led home: | 258 | | Living alone: | 240 | | Not living alone: | 18 | | Population of Renter occupied homes: | 1,510 | | Family run homes: | 874 | | Husband-wife family: | 258 | | Other family: | 616 | | Male led with no wife present: | 85 | | Female led with no husband present: | 531 | | Nonfamily Homes: | 636 | | Male led homes: | 226 | | Male living alone: | 171 | | Male not living alone: | 55 | | Female led homes: | 410 | | Females living alone: | 375 | | Females not living alone: | 35 |
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