Population Demographics for St Mary's County, Maryland in 2020, 2019
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| | Male | Female | Total | | Total Population | 52,321 | 52,830 | 105,151 | | White | 41,473 | 41,163 | 82,636 | | Black or African American | 7,318 | 7,712 | 15,030 | | Hispanic or Latino | 2,024 | 1,948 | 3,972 | | Two or More Races | 1,620 | 1,718 | 3,338 | | Asian | 1,090 | 1,506 | 2,596 | | Some Other Race | 572 | 482 | 1,054 | | American Indian | 214 | 210 | 424 | | Three or more races | 126 | 158 | 284 |
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| Total population in St Mary's County | | | Total Population: | 105,151 | | Male Population: | 52,321 | | Female Population: | 52,830 |
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| Median age in St Mary's County | | | Both sexes | 36 | | Male | 35 | | Female | 36 |
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| Population in households in St Mary's County | | | Total Population: | 102,225 | | Male Population: | 50,682 | | Under 5 years: | 3,841 | | 5 to 9 years: | 3,786 | | 10 to 14 years: | 3,903 | | 15 to 17 years: | 2,413 | | 18 and 19 years: | 1,279 | | 20 years: | 591 | | 21 years: | 506 | | 22 to 24 years: | 1,929 | | 25 to 29 years: | 3,501 | | 30 to 34 years: | 3,117 | | 35 to 39 years: | 3,176 | | 40 to 44 years: | 3,894 | | 45 to 49 years: | 4,566 | | 50 to 54 years: | 3,998 | | 55 to 59 years: | 3,050 | | 60 and 61 years: | 1,012 | | 62 to 64 years: | 1,442 | | 65 and 66 years: | 800 | | 67 to 69 years: | 1,007 | | 70 to 74 years: | 1,251 | | 75 to 79 years: | 769 | | 80 to 84 years: | 495 | | 85 years and over: | 356 | | Female Population: | 51,543 | | Under 5 years: | 3,728 | | 5 to 9 years: | 3,837 | | 10 to 14 years: | 3,750 | | 15 to 17 years: | 2,300 | | 18 and 19 years: | 1,208 | | 20 years: | 598 | | 21 years: | 500 | | 22 to 24 years: | 1,976 | | 25 to 29 years: | 3,375 | | 30 to 34 years: | 3,230 | | 35 to 39 years: | 3,466 | | 40 to 44 years: | 4,107 | | 45 to 49 years: | 4,408 | | 50 to 54 years: | 3,896 | | 55 to 59 years: | 3,107 | | 60 and 61 years: | 1,106 | | 62 to 64 years: | 1,455 | | 65 and 66 years: | 814 | | 67 to 69 years: | 1,002 | | 70 to 74 years: | 1,319 | | 75 to 79 years: | 972 | | 80 to 84 years: | 703 | | 85 years and over: | 686 |
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| Average household size in St Mary's County | | | Total: | 2 | | Under 18 years: | 0 | | 18 years and over: | 1 |
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| Number of occupied homes in St Mary's County | | | Total: | 37,604 | | Family led homes: | 27,084 | | Husband-wife family: | 20,870 | | Other family: | 6,214 | | Population of male led with no wife present: | 1,824 | | Population female led with no husband present: | 4,390 | | Population of Nonfamily homes: | 10,520 | | Population living alone: | 8,183 | | Population not living alone: | 2,337 |
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| Total occupied homes in St Mary's County with people under 18 years old: | | | Total: | 37,604 | | Population of homes with one or more people under 18 years: | 14,464 | | Population of family homes: | 14,300 | | Husband-wife family: | 10,142 | | Under 6 years only: | 2,382 | | Under 6 years and 6 to 17 years: | 2,298 | | 6 to 17 years only: | 5,462 | | Other family: | 4,158 | | Male householder, no wife present: | 1,156 | | Under 6 years only: | 304 | | Under 6 years and 6 to 17 years: | 229 | | 6 to 17 years only: | 623 | | Female led with no husband present: | 3,002 | | Under 6 years only: | 677 | | Under 6 years and 6 to 17 years: | 611 | | 6 to 17 years only: | 1,714 | | Nonfamily households: | 164 | | Male led households: | 132 | | Under 6 years only: | 20 | | Under 6 years and 6 to 17 years: | 13 | | 6 to 17 years only: | 99 | | Female led householder: | 32 | | Under 6 years only: | 5 | | Under 6 years and 6 to 17 years: | 4 | | 6 to 17 years only: | 23 | | Households with no people under 18 years: | 23,140 | | Family households: | 12,784 | | Husband-wife family: | 10,728 | | Other family: | 2,056 | | Male led with no wife present: | 668 | | Female led with no husband present: | 1,388 | | Nonfamily households: | 10,356 | | Male led householder: | 5,548 | | Female led householder: | 4,808 |
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| Total number led homes in St Mary's County, by type | | | Total Home Population: | 37,604 | | Population of Family homes: | 27,084 | | Population of 15 to 24 year olds: | 725 | | Population of 25 to 34 year olds: | 4,474 | | Population of 35 to 44 year olds: | 6,305 | | Population of 45 to 54 year olds: | 7,192 | | Population of 55 to 59 year olds: | 2,515 | | Population of 60 to 64 year olds: | 2,050 | | Population of 65 to 74 year olds: | 2,547 | | Population of 75 to 84 year olds: | 1,014 | | Population of 85 year olds and over: | 262 | | Population of Nonfamily Homes: | 10,520 | | Population of 15 to 24 year olds: | 761 | | Population of 25 to 34 year olds: | 1,723 | | Population of 35 to 44 year olds: | 1,270 | | Population of 45 to 54 year olds: | 2,228 | | Population of 55 to 59 year olds: | 983 | | Population of 60 to 64 year olds: | 892 | | Population of 65 to 74 year olds: | 1,258 | | Population of 75 to 84 year olds: | 933 | | Population of 85 year olds and over: | 472 |
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| households in St Mary's County containing people over 60 | | | Total Population: | 37,604 | | Population of homes with one or more people 60 years and over: | 10,751 | | 1-person household: | 3,247 | | 2-or-more-person household: | 7,504 | | Family households: | 7,123 | | Nonfamily households: | 381 | | Population of homes with no people 60 years and over: | 26,853 | | 1-person household: | 4,936 | | 2-or-more-person household: | 21,917 | | Family homes: | 19,961 | | Nonfamily homes: | 1,956 |
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| homes in St Mary's County with multiple generations. | | | Total Population: | 37,604 | | Home has three or more generations: | 1,650 | | Home does not have three or more generations: | 35,954 |
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| Unmarried population in St Mary's County under 18 years old in homes | | | Total Population: | 27,551 | | Unmarried partner of home lead present: | 2,231 | | In family homes: | 2,079 | | Population of male led and male partner homes: | 58 | | Population of male led and female partner households: | 904 | | Population of female led and female partner households: | 105 | | Population of female led and male partner households: | 1,012 | | In nonfamily homes: | 152 | | Population of male led and male partner homes: | 0 | | Population of male led and female partner homes: | 139 | | Population of female led and female partner homes: | 5 | | Population of female led and male partner homes: | 8 | | No unmarried partner of home lead present: | 25,320 | | In family homes: | 25,219 | | Population of husband-wife family homes: | 19,830 | | Population of male lead with no wife present, family homes: | 1,038 | | Population of female lead with no husband present, family homes: | 4,351 | | In nonfamily homes: | 101 |
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| Population in families living in St Mary's County | | | Total Population: | 86,135 | | Population Under 18 years: | 27,097 | | Population 18 years and over: | 59,038 |
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| How long in St Mary's County have lived in one place. | | | Total: | 37,604 | | Population of Owner occupied homes: | 26,966 | | Family home: | 20,948 | | Nonfamily homess: | 6,018 | | Male led home: | 3,110 | | Living alone: | 2,351 | | Not living alone: | 759 | | Female led home: | 2,908 | | Living alone: | 2,424 | | Not living alone: | 484 | | Population of Renter occupied homes: | 10,638 | | Family run homes: | 6,136 | | Husband-wife family: | 3,369 | | Other family: | 2,767 | | Male led with no wife present: | 658 | | Female led with no husband present: | 2,109 | | Nonfamily Homes: | 4,502 | | Male led homes: | 2,570 | | Male living alone: | 1,900 | | Male not living alone: | 670 | | Female led homes: | 1,932 | | Females living alone: | 1,508 | | Females not living alone: | 424 |
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