Population Demographics for San Marino, California in 2020, 2019
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| Total population in San Marino | | | Total Population: | 13,147 | | Male Population: | 6,314 | | Female Population: | 6,833 |
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| Median age in San Marino | | | Both sexes | 45 | | Male | 44 | | Female | 46 |
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| Population in households in San Marino | | | Total Population: | 13,066 | | Male Population: | 6,241 | | Under 5 years: | 241 | | 5 to 9 years: | 489 | | 10 to 14 years: | 636 | | 15 to 17 years: | 356 | | 18 and 19 years: | 116 | | 20 years: | 50 | | 21 years: | 52 | | 22 to 24 years: | 160 | | 25 to 29 years: | 213 | | 30 to 34 years: | 169 | | 35 to 39 years: | 231 | | 40 to 44 years: | 425 | | 45 to 49 years: | 567 | | 50 to 54 years: | 550 | | 55 to 59 years: | 525 | | 60 and 61 years: | 174 | | 62 to 64 years: | 239 | | 65 and 66 years: | 121 | | 67 to 69 years: | 201 | | 70 to 74 years: | 235 | | 75 to 79 years: | 199 | | 80 to 84 years: | 168 | | 85 years and over: | 124 | | Female Population: | 6,825 | | Under 5 years: | 274 | | 5 to 9 years: | 470 | | 10 to 14 years: | 541 | | 15 to 17 years: | 367 | | 18 and 19 years: | 105 | | 20 years: | 42 | | 21 years: | 41 | | 22 to 24 years: | 134 | | 25 to 29 years: | 212 | | 30 to 34 years: | 181 | | 35 to 39 years: | 368 | | 40 to 44 years: | 552 | | 45 to 49 years: | 618 | | 50 to 54 years: | 659 | | 55 to 59 years: | 555 | | 60 and 61 years: | 194 | | 62 to 64 years: | 256 | | 65 and 66 years: | 139 | | 67 to 69 years: | 190 | | 70 to 74 years: | 297 | | 75 to 79 years: | 238 | | 80 to 84 years: | 206 | | 85 years and over: | 186 |
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| Average household size in San Marino | | | Total: | 3 | | Under 18 years: | 0 | | 18 years and over: | 2 |
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| Number of occupied homes in San Marino | | | Total: | 4,330 | | Family led homes: | 3,730 | | Husband-wife family: | 3,220 | | Other family: | 510 | | Population of male led with no wife present: | 143 | | Population female led with no husband present: | 367 | | Population of Nonfamily homes: | 600 | | Population living alone: | 531 | | Population not living alone: | 69 |
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| Total occupied homes in San Marino with people under 18 years old: | | | Total: | 4,330 | | Population of homes with one or more people under 18 years: | 1,818 | | Population of family homes: | 1,814 | | Husband-wife family: | 1,568 | | Under 6 years only: | 186 | | Under 6 years and 6 to 17 years: | 259 | | 6 to 17 years only: | 1,123 | | Other family: | 246 | | Male householder, no wife present: | 65 | | Under 6 years only: | 8 | | Under 6 years and 6 to 17 years: | 7 | | 6 to 17 years only: | 50 | | Female led with no husband present: | 181 | | Under 6 years only: | 17 | | Under 6 years and 6 to 17 years: | 15 | | 6 to 17 years only: | 149 | | Nonfamily households: | 4 | | Male led households: | 2 | | Under 6 years only: | 0 | | Under 6 years and 6 to 17 years: | 0 | | 6 to 17 years only: | 2 | | Female led householder: | 2 | | Under 6 years only: | 0 | | Under 6 years and 6 to 17 years: | 0 | | 6 to 17 years only: | 2 | | Households with no people under 18 years: | 2,512 | | Family households: | 1,916 | | Husband-wife family: | 1,652 | | Other family: | 264 | | Male led with no wife present: | 78 | | Female led with no husband present: | 186 | | Nonfamily households: | 596 | | Male led householder: | 168 | | Female led householder: | 428 |
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| Total number led homes in San Marino, by type | | | Total Home Population: | 4,330 | | Population of Family homes: | 3,730 | | Population of 15 to 24 year olds: | 15 | | Population of 25 to 34 year olds: | 89 | | Population of 35 to 44 year olds: | 635 | | Population of 45 to 54 year olds: | 1,142 | | Population of 55 to 59 year olds: | 521 | | Population of 60 to 64 year olds: | 397 | | Population of 65 to 74 year olds: | 507 | | Population of 75 to 84 year olds: | 321 | | Population of 85 year olds and over: | 103 | | Population of Nonfamily Homes: | 600 | | Population of 15 to 24 year olds: | 6 | | Population of 25 to 34 year olds: | 27 | | Population of 35 to 44 year olds: | 24 | | Population of 45 to 54 year olds: | 43 | | Population of 55 to 59 year olds: | 57 | | Population of 60 to 64 year olds: | 55 | | Population of 65 to 74 year olds: | 122 | | Population of 75 to 84 year olds: | 178 | | Population of 85 year olds and over: | 88 |
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| households in San Marino containing people over 60 | | | Total Population: | 4,330 | | Population of homes with one or more people 60 years and over: | 2,070 | | 1-person household: | 406 | | 2-or-more-person household: | 1,664 | | Family households: | 1,625 | | Nonfamily households: | 39 | | Population of homes with no people 60 years and over: | 2,260 | | 1-person household: | 125 | | 2-or-more-person household: | 2,135 | | Family homes: | 2,105 | | Nonfamily homes: | 30 |
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| homes in San Marino with multiple generations. | | | Total Population: | 4,330 | | Home has three or more generations: | 241 | | Home does not have three or more generations: | 4,089 |
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| Unmarried population in San Marino under 18 years old in homes | | | Total Population: | 3,374 | | Unmarried partner of home lead present: | 43 | | In family homes: | 39 | | Population of male led and male partner homes: | 3 | | Population of male led and female partner households: | 10 | | Population of female led and female partner households: | 13 | | Population of female led and male partner households: | 13 | | In nonfamily homes: | 4 | | Population of male led and male partner homes: | 0 | | Population of male led and female partner homes: | 2 | | Population of female led and female partner homes: | 0 | | Population of female led and male partner homes: | 2 | | No unmarried partner of home lead present: | 3,331 | | In family homes: | 3,330 | | Population of husband-wife family homes: | 2,970 | | Population of male lead with no wife present, family homes: | 96 | | Population of female lead with no husband present, family homes: | 264 | | In nonfamily homes: | 1 |
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| Population in families living in San Marino | | | Total Population: | 12,234 | | Population Under 18 years: | 3,359 | | Population 18 years and over: | 8,875 |
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| How long in San Marino have lived in one place. | | | Total: | 4,330 | | Population of Owner occupied homes: | 3,959 | | Family home: | 3,420 | | Nonfamily homess: | 539 | | Male led home: | 143 | | Living alone: | 125 | | Not living alone: | 18 | | Female led home: | 396 | | Living alone: | 362 | | Not living alone: | 34 | | Population of Renter occupied homes: | 371 | | Family run homes: | 310 | | Husband-wife family: | 232 | | Other family: | 78 | | Male led with no wife present: | 25 | | Female led with no husband present: | 53 | | Nonfamily Homes: | 61 | | Male led homes: | 27 | | Male living alone: | 17 | | Male not living alone: | 10 | | Female led homes: | 34 | | Females living alone: | 27 | | Females not living alone: | 7 |
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