Population Demographics for Greenwich, Connecticut in 2020, 2019
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| Total population in Greenwich | | | Total Population: | 12,942 | | Male Population: | 5,949 | | Female Population: | 6,993 |
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| Median age in Greenwich | | | Both sexes | 42 | | Male | 40 | | Female | 45 |
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| Population in households in Greenwich | | | Total Population: | 12,827 | | Male Population: | 5,882 | | Under 5 years: | 349 | | 5 to 9 years: | 369 | | 10 to 14 years: | 417 | | 15 to 17 years: | 267 | | 18 and 19 years: | 121 | | 20 years: | 45 | | 21 years: | 48 | | 22 to 24 years: | 143 | | 25 to 29 years: | 364 | | 30 to 34 years: | 397 | | 35 to 39 years: | 396 | | 40 to 44 years: | 417 | | 45 to 49 years: | 454 | | 50 to 54 years: | 467 | | 55 to 59 years: | 419 | | 60 and 61 years: | 139 | | 62 to 64 years: | 178 | | 65 and 66 years: | 118 | | 67 to 69 years: | 167 | | 70 to 74 years: | 192 | | 75 to 79 years: | 159 | | 80 to 84 years: | 143 | | 85 years and over: | 113 | | Female Population: | 6,945 | | Under 5 years: | 361 | | 5 to 9 years: | 360 | | 10 to 14 years: | 403 | | 15 to 17 years: | 236 | | 18 and 19 years: | 84 | | 20 years: | 42 | | 21 years: | 42 | | 22 to 24 years: | 145 | | 25 to 29 years: | 402 | | 30 to 34 years: | 427 | | 35 to 39 years: | 436 | | 40 to 44 years: | 524 | | 45 to 49 years: | 621 | | 50 to 54 years: | 595 | | 55 to 59 years: | 451 | | 60 and 61 years: | 164 | | 62 to 64 years: | 243 | | 65 and 66 years: | 144 | | 67 to 69 years: | 219 | | 70 to 74 years: | 273 | | 75 to 79 years: | 245 | | 80 to 84 years: | 262 | | 85 years and over: | 266 |
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| Average household size in Greenwich | | | Total: | 2 | | Under 18 years: | 0 | | 18 years and over: | 1 |
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| Number of occupied homes in Greenwich | | | Total: | 5,779 | | Family led homes: | 3,247 | | Husband-wife family: | 2,419 | | Other family: | 828 | | Population of male led with no wife present: | 160 | | Population female led with no husband present: | 668 | | Population of Nonfamily homes: | 2,532 | | Population living alone: | 2,195 | | Population not living alone: | 337 |
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| Total occupied homes in Greenwich with people under 18 years old: | | | Total: | 5,779 | | Population of homes with one or more people under 18 years: | 1,554 | | Population of family homes: | 1,546 | | Husband-wife family: | 1,097 | | Under 6 years only: | 292 | | Under 6 years and 6 to 17 years: | 193 | | 6 to 17 years only: | 612 | | Other family: | 449 | | Male householder, no wife present: | 64 | | Under 6 years only: | 23 | | Under 6 years and 6 to 17 years: | 3 | | 6 to 17 years only: | 38 | | Female led with no husband present: | 385 | | Under 6 years only: | 76 | | Under 6 years and 6 to 17 years: | 49 | | 6 to 17 years only: | 260 | | Nonfamily households: | 8 | | Male led households: | 4 | | Under 6 years only: | 2 | | Under 6 years and 6 to 17 years: | 1 | | 6 to 17 years only: | 1 | | Female led householder: | 4 | | Under 6 years only: | 0 | | Under 6 years and 6 to 17 years: | 0 | | 6 to 17 years only: | 4 | | Households with no people under 18 years: | 4,225 | | Family households: | 1,701 | | Husband-wife family: | 1,322 | | Other family: | 379 | | Male led with no wife present: | 96 | | Female led with no husband present: | 283 | | Nonfamily households: | 2,524 | | Male led householder: | 957 | | Female led householder: | 1,567 |
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| Total number led homes in Greenwich, by type | | | Total Home Population: | 5,779 | | Population of Family homes: | 3,247 | | Population of 15 to 24 year olds: | 31 | | Population of 25 to 34 year olds: | 400 | | Population of 35 to 44 year olds: | 674 | | Population of 45 to 54 year olds: | 827 | | Population of 55 to 59 year olds: | 352 | | Population of 60 to 64 year olds: | 258 | | Population of 65 to 74 year olds: | 380 | | Population of 75 to 84 year olds: | 240 | | Population of 85 year olds and over: | 85 | | Population of Nonfamily Homes: | 2,532 | | Population of 15 to 24 year olds: | 53 | | Population of 25 to 34 year olds: | 367 | | Population of 35 to 44 year olds: | 339 | | Population of 45 to 54 year olds: | 450 | | Population of 55 to 59 year olds: | 176 | | Population of 60 to 64 year olds: | 200 | | Population of 65 to 74 year olds: | 364 | | Population of 75 to 84 year olds: | 359 | | Population of 85 year olds and over: | 224 |
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| households in Greenwich containing people over 60 | | | Total Population: | 5,779 | | Population of homes with one or more people 60 years and over: | 2,283 | | 1-person household: | 1,077 | | 2-or-more-person household: | 1,206 | | Family households: | 1,122 | | Nonfamily households: | 84 | | Population of homes with no people 60 years and over: | 3,496 | | 1-person household: | 1,118 | | 2-or-more-person household: | 2,378 | | Family homes: | 2,125 | | Nonfamily homes: | 253 |
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| homes in Greenwich with multiple generations. | | | Total Population: | 5,779 | | Home has three or more generations: | 114 | | Home does not have three or more generations: | 5,665 |
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| Unmarried population in Greenwich under 18 years old in homes | | | Total Population: | 2,761 | | Unmarried partner of home lead present: | 84 | | In family homes: | 84 | | Population of male led and male partner homes: | 13 | | Population of male led and female partner households: | 24 | | Population of female led and female partner households: | 7 | | Population of female led and male partner households: | 40 | | In nonfamily homes: | 0 | | Population of male led and male partner homes: | 0 | | Population of male led and female partner homes: | 0 | | 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: | 2,677 | | In family homes: | 2,669 | | Population of husband-wife family homes: | 2,072 | | Population of male lead with no wife present, family homes: | 47 | | Population of female lead with no husband present, family homes: | 550 | | In nonfamily homes: | 8 |
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| Population in families living in Greenwich | | | Total Population: | 9,678 | | Population Under 18 years: | 2,744 | | Population 18 years and over: | 6,934 |
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| How long in Greenwich have lived in one place. | | | Total: | 5,779 | | Population of Owner occupied homes: | 2,660 | | Family home: | 1,685 | | Nonfamily homess: | 975 | | Male led home: | 266 | | Living alone: | 236 | | Not living alone: | 30 | | Female led home: | 709 | | Living alone: | 657 | | Not living alone: | 52 | | Population of Renter occupied homes: | 3,119 | | Family run homes: | 1,562 | | Husband-wife family: | 970 | | Other family: | 592 | | Male led with no wife present: | 104 | | Female led with no husband present: | 488 | | Nonfamily Homes: | 1,557 | | Male led homes: | 695 | | Male living alone: | 558 | | Male not living alone: | 137 | | Female led homes: | 862 | | Females living alone: | 744 | | Females not living alone: | 118 |
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