Population Demographics for Sammamish, Washington in 2020, 2019
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| | Male | Female | Total | Total Population | 22,921 | 22,859 | 45,780 | White | 17,317 | 16,890 | 34,207 | Asian | 4,236 | 4,616 | 8,852 | Hispanic or Latino | 866 | 938 | 1,804 | Two or More Races | 846 | 868 | 1,714 | Black or African American | 234 | 205 | 439 | Some Other Race | 207 | 188 | 395 | Three or more races | 63 | 71 | 134 | American Indian | 61 | 65 | 126 |
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| Total population in Sammamish | | Total Population: | 45,780 | Male Population: | 22,921 | Female Population: | 22,859 |
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| Median age in Sammamish | | Both sexes | 37 | Male | 37 | Female | 37 |
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| Population in households in Sammamish | | Total Population: | 45,681 | Male Population: | 22,884 | Under 5 years: | 1,593 | 5 to 9 years: | 2,347 | 10 to 14 years: | 2,318 | 15 to 17 years: | 1,309 | 18 and 19 years: | 505 | 20 years: | 157 | 21 years: | 115 | 22 to 24 years: | 425 | 25 to 29 years: | 677 | 30 to 34 years: | 1,075 | 35 to 39 years: | 1,963 | 40 to 44 years: | 2,369 | 45 to 49 years: | 2,278 | 50 to 54 years: | 1,958 | 55 to 59 years: | 1,483 | 60 and 61 years: | 463 | 62 to 64 years: | 584 | 65 and 66 years: | 259 | 67 to 69 years: | 319 | 70 to 74 years: | 300 | 75 to 79 years: | 184 | 80 to 84 years: | 126 | 85 years and over: | 77 | Female Population: | 22,797 | Under 5 years: | 1,588 | 5 to 9 years: | 2,188 | 10 to 14 years: | 2,175 | 15 to 17 years: | 1,234 | 18 and 19 years: | 377 | 20 years: | 124 | 21 years: | 92 | 22 to 24 years: | 404 | 25 to 29 years: | 775 | 30 to 34 years: | 1,313 | 35 to 39 years: | 2,137 | 40 to 44 years: | 2,429 | 45 to 49 years: | 2,359 | 50 to 54 years: | 1,870 | 55 to 59 years: | 1,482 | 60 and 61 years: | 450 | 62 to 64 years: | 499 | 65 and 66 years: | 270 | 67 to 69 years: | 284 | 70 to 74 years: | 306 | 75 to 79 years: | 198 | 80 to 84 years: | 124 | 85 years and over: | 119 |
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| Average household size in Sammamish | | Total: | 3 | Under 18 years: | 0 | 18 years and over: | 2 |
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| Number of occupied homes in Sammamish | | Total: | 15,154 | Family led homes: | 12,918 | Husband-wife family: | 11,648 | Other family: | 1,270 | Population of male led with no wife present: | 414 | Population female led with no husband present: | 856 | Population of Nonfamily homes: | 2,236 | Population living alone: | 1,721 | Population not living alone: | 515 |
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| Total occupied homes in Sammamish with people under 18 years old: | | Total: | 15,154 | Population of homes with one or more people under 18 years: | 8,016 | Population of family homes: | 7,983 | Husband-wife family: | 7,134 | Under 6 years only: | 1,496 | Under 6 years and 6 to 17 years: | 1,381 | 6 to 17 years only: | 4,257 | Other family: | 849 | Male householder, no wife present: | 270 | Under 6 years only: | 32 | Under 6 years and 6 to 17 years: | 26 | 6 to 17 years only: | 212 | Female led with no husband present: | 579 | Under 6 years only: | 57 | Under 6 years and 6 to 17 years: | 58 | 6 to 17 years only: | 464 | Nonfamily households: | 33 | Male led households: | 26 | Under 6 years only: | 6 | Under 6 years and 6 to 17 years: | 0 | 6 to 17 years only: | 20 | Female led householder: | 7 | Under 6 years only: | 0 | Under 6 years and 6 to 17 years: | 0 | 6 to 17 years only: | 7 | Households with no people under 18 years: | 7,138 | Family households: | 4,935 | Husband-wife family: | 4,514 | Other family: | 421 | Male led with no wife present: | 144 | Female led with no husband present: | 277 | Nonfamily households: | 2,203 | Male led householder: | 1,112 | Female led householder: | 1,091 |
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| Total number led homes in Sammamish, by type | | Total Home Population: | 15,154 | Population of Family homes: | 12,918 | Population of 15 to 24 year olds: | 64 | Population of 25 to 34 year olds: | 1,175 | Population of 35 to 44 year olds: | 4,190 | Population of 45 to 54 year olds: | 4,113 | Population of 55 to 59 year olds: | 1,397 | Population of 60 to 64 year olds: | 931 | Population of 65 to 74 year olds: | 739 | Population of 75 to 84 year olds: | 255 | Population of 85 year olds and over: | 54 | Population of Nonfamily Homes: | 2,236 | Population of 15 to 24 year olds: | 103 | Population of 25 to 34 year olds: | 378 | Population of 35 to 44 year olds: | 412 | Population of 45 to 54 year olds: | 507 | Population of 55 to 59 year olds: | 279 | Population of 60 to 64 year olds: | 190 | Population of 65 to 74 year olds: | 215 | Population of 75 to 84 year olds: | 101 | Population of 85 year olds and over: | 51 |
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| households in Sammamish containing people over 60 | | Total Population: | 15,154 | Population of homes with one or more people 60 years and over: | 3,041 | 1-person household: | 483 | 2-or-more-person household: | 2,558 | Family households: | 2,472 | Nonfamily households: | 86 | Population of homes with no people 60 years and over: | 12,113 | 1-person household: | 1,238 | 2-or-more-person household: | 10,875 | Family homes: | 10,446 | Nonfamily homes: | 429 |
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| homes in Sammamish with multiple generations. | | Total Population: | 15,154 | Home has three or more generations: | 367 | Home does not have three or more generations: | 14,787 |
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| Unmarried population in Sammamish under 18 years old in homes | | Total Population: | 14,748 | Unmarried partner of home lead present: | 276 | In family homes: | 250 | Population of male led and male partner homes: | 22 | Population of male led and female partner households: | 106 | Population of female led and female partner households: | 22 | Population of female led and male partner households: | 100 | In nonfamily homes: | 26 | Population of male led and male partner homes: | 0 | Population of male led and female partner homes: | 22 | Population of female led and female partner homes: | 0 | Population of female led and male partner homes: | 4 | No unmarried partner of home lead present: | 14,472 | In family homes: | 14,458 | Population of husband-wife family homes: | 13,317 | Population of male lead with no wife present, family homes: | 308 | Population of female lead with no husband present, family homes: | 833 | In nonfamily homes: | 14 |
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| Population in families living in Sammamish | | Total Population: | 42,409 | Population Under 18 years: | 14,670 | Population 18 years and over: | 27,739 |
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| How long in Sammamish have lived in one place. | | Total: | 15,154 | Population of Owner occupied homes: | 13,329 | Family home: | 11,785 | Nonfamily homess: | 1,544 | Male led home: | 756 | Living alone: | 567 | Not living alone: | 189 | Female led home: | 788 | Living alone: | 656 | Not living alone: | 132 | Population of Renter occupied homes: | 1,825 | Family run homes: | 1,133 | Husband-wife family: | 775 | Other family: | 358 | Male led with no wife present: | 133 | Female led with no husband present: | 225 | Nonfamily Homes: | 692 | Male led homes: | 382 | Male living alone: | 270 | Male not living alone: | 112 | Female led homes: | 310 | Females living alone: | 228 | Females not living alone: | 82 |
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