Population Demographics for San Marcos, California in 2020, 2019
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| | Male | Female | Total | | Total Population | 40,957 | 42,824 | 83,781 | | White | 25,852 | 27,383 | 53,235 | | Hispanic or Latino | 15,312 | 15,385 | 30,697 | | Some Other Race | 8,006 | 7,847 | 15,853 | | Asian | 3,414 | 4,104 | 7,518 | | Two or More Races | 2,172 | 2,123 | 4,295 | | Black or African American | 1,040 | 927 | 1,967 | | American Indian | 307 | 284 | 591 | | Native Hawaiian Pacific Islander | 166 | 156 | 322 | | Three or more races | 166 | 148 | 314 |
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| Total population in San Marcos | | | Total Population: | 83,781 | | Male Population: | 40,957 | | Female Population: | 42,824 |
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| Median age in San Marcos | | | Both sexes | 32 | | Male | 31 | | Female | 33 |
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| Population in households in San Marcos | | | Total Population: | 82,937 | | Male Population: | 40,627 | | Under 5 years: | 3,522 | | 5 to 9 years: | 3,369 | | 10 to 14 years: | 3,179 | | 15 to 17 years: | 1,799 | | 18 and 19 years: | 1,220 | | 20 years: | 681 | | 21 years: | 599 | | 22 to 24 years: | 1,761 | | 25 to 29 years: | 3,020 | | 30 to 34 years: | 2,965 | | 35 to 39 years: | 3,360 | | 40 to 44 years: | 3,153 | | 45 to 49 years: | 2,807 | | 50 to 54 years: | 2,380 | | 55 to 59 years: | 1,858 | | 60 and 61 years: | 680 | | 62 to 64 years: | 824 | | 65 and 66 years: | 480 | | 67 to 69 years: | 612 | | 70 to 74 years: | 784 | | 75 to 79 years: | 634 | | 80 to 84 years: | 500 | | 85 years and over: | 440 | | Female Population: | 42,310 | | Under 5 years: | 3,486 | | 5 to 9 years: | 3,271 | | 10 to 14 years: | 2,896 | | 15 to 17 years: | 1,759 | | 18 and 19 years: | 1,296 | | 20 years: | 755 | | 21 years: | 646 | | 22 to 24 years: | 1,640 | | 25 to 29 years: | 2,883 | | 30 to 34 years: | 3,149 | | 35 to 39 years: | 3,411 | | 40 to 44 years: | 3,255 | | 45 to 49 years: | 2,729 | | 50 to 54 years: | 2,301 | | 55 to 59 years: | 2,073 | | 60 and 61 years: | 754 | | 62 to 64 years: | 1,060 | | 65 and 66 years: | 614 | | 67 to 69 years: | 753 | | 70 to 74 years: | 1,032 | | 75 to 79 years: | 874 | | 80 to 84 years: | 807 | | 85 years and over: | 866 |
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| Average household size in San Marcos | | | Total: | 3 | | Under 18 years: | 0 | | 18 years and over: | 2 |
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| Number of occupied homes in San Marcos | | | Total: | 27,202 | | Family led homes: | 19,811 | | Husband-wife family: | 15,242 | | Other family: | 4,569 | | Population of male led with no wife present: | 1,513 | | Population female led with no husband present: | 3,056 | | Population of Nonfamily homes: | 7,391 | | Population living alone: | 5,168 | | Population not living alone: | 2,223 |
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| Total occupied homes in San Marcos with people under 18 years old: | | | Total: | 27,202 | | Population of homes with one or more people under 18 years: | 11,724 | | Population of family homes: | 11,650 | | Husband-wife family: | 8,733 | | Under 6 years only: | 2,394 | | Under 6 years and 6 to 17 years: | 2,438 | | 6 to 17 years only: | 3,901 | | Other family: | 2,917 | | Male householder, no wife present: | 951 | | Under 6 years only: | 210 | | Under 6 years and 6 to 17 years: | 223 | | 6 to 17 years only: | 518 | | Female led with no husband present: | 1,966 | | Under 6 years only: | 352 | | Under 6 years and 6 to 17 years: | 410 | | 6 to 17 years only: | 1,204 | | Nonfamily households: | 74 | | Male led households: | 55 | | Under 6 years only: | 16 | | Under 6 years and 6 to 17 years: | 8 | | 6 to 17 years only: | 31 | | Female led householder: | 19 | | Under 6 years only: | 4 | | Under 6 years and 6 to 17 years: | 2 | | 6 to 17 years only: | 13 | | Households with no people under 18 years: | 15,478 | | Family households: | 8,161 | | Husband-wife family: | 6,509 | | Other family: | 1,652 | | Male led with no wife present: | 562 | | Female led with no husband present: | 1,090 | | Nonfamily households: | 7,317 | | Male led householder: | 3,114 | | Female led householder: | 4,203 |
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| Total number led homes in San Marcos, by type | | | Total Home Population: | 27,202 | | Population of Family homes: | 19,811 | | Population of 15 to 24 year olds: | 571 | | Population of 25 to 34 year olds: | 3,432 | | Population of 35 to 44 year olds: | 5,706 | | Population of 45 to 54 year olds: | 4,528 | | Population of 55 to 59 year olds: | 1,577 | | Population of 60 to 64 year olds: | 1,217 | | Population of 65 to 74 year olds: | 1,563 | | Population of 75 to 84 year olds: | 905 | | Population of 85 year olds and over: | 312 | | Population of Nonfamily Homes: | 7,391 | | Population of 15 to 24 year olds: | 859 | | Population of 25 to 34 year olds: | 1,016 | | Population of 35 to 44 year olds: | 771 | | Population of 45 to 54 year olds: | 1,004 | | Population of 55 to 59 year olds: | 547 | | Population of 60 to 64 year olds: | 619 | | Population of 65 to 74 year olds: | 949 | | Population of 75 to 84 year olds: | 963 | | Population of 85 year olds and over: | 663 |
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| households in San Marcos containing people over 60 | | | Total Population: | 27,202 | | Population of homes with one or more people 60 years and over: | 8,471 | | 1-person household: | 2,877 | | 2-or-more-person household: | 5,594 | | Family households: | 5,196 | | Nonfamily households: | 398 | | Population of homes with no people 60 years and over: | 18,731 | | 1-person household: | 2,291 | | 2-or-more-person household: | 16,440 | | Family homes: | 14,615 | | Nonfamily homes: | 1,825 |
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| homes in San Marcos with multiple generations. | | | Total Population: | 27,202 | | Home has three or more generations: | 1,575 | | Home does not have three or more generations: | 25,627 |
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| Unmarried population in San Marcos under 18 years old in homes | | | Total Population: | 23,270 | | Unmarried partner of home lead present: | 1,343 | | In family homes: | 1,301 | | Population of male led and male partner homes: | 68 | | Population of male led and female partner households: | 690 | | Population of female led and female partner households: | 79 | | Population of female led and male partner households: | 464 | | In nonfamily homes: | 42 | | Population of male led and male partner homes: | 1 | | Population of male led and female partner homes: | 31 | | Population of female led and female partner homes: | 0 | | Population of female led and male partner homes: | 10 | | No unmarried partner of home lead present: | 21,927 | | In family homes: | 21,863 | | Population of husband-wife family homes: | 17,741 | | Population of male lead with no wife present, family homes: | 1,036 | | Population of female lead with no husband present, family homes: | 3,086 | | In nonfamily homes: | 64 |
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| Population in families living in San Marcos | | | Total Population: | 69,095 | | Population Under 18 years: | 22,838 | | Population 18 years and over: | 46,257 |
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| How long in San Marcos have lived in one place. | | | Total: | 27,202 | | Population of Owner occupied homes: | 17,094 | | Family home: | 13,105 | | Nonfamily homess: | 3,989 | | Male led home: | 1,585 | | Living alone: | 1,088 | | Not living alone: | 497 | | Female led home: | 2,404 | | Living alone: | 1,981 | | Not living alone: | 423 | | Population of Renter occupied homes: | 10,108 | | Family run homes: | 6,706 | | Husband-wife family: | 4,224 | | Other family: | 2,482 | | Male led with no wife present: | 830 | | Female led with no husband present: | 1,652 | | Nonfamily Homes: | 3,402 | | Male led homes: | 1,584 | | Male living alone: | 869 | | Male not living alone: | 715 | | Female led homes: | 1,818 | | Females living alone: | 1,230 | | Females not living alone: | 588 |
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