Population Demographics for St Mary Parish, Louisiana in 2020, 2019
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| | Male | Female | Total | | Total Population | 26,992 | 27,658 | 54,650 | | White | 16,048 | 16,358 | 32,406 | | Black or African American | 8,401 | 9,364 | 17,765 | | Hispanic or Latino | 1,793 | 1,127 | 2,920 | | Some Other Race | 943 | 490 | 1,433 | | Two or More Races | 546 | 529 | 1,075 | | American Indian | 485 | 509 | 994 | | Asian | 552 | 396 | 948 |
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| Total population in St Mary Parish | | | Total Population: | 54,650 | | Male Population: | 26,992 | | Female Population: | 27,658 |
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| Median age in St Mary Parish | | | Both sexes | 38 | | Male | 36 | | Female | 39 |
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| Population in households in St Mary Parish | | | Total Population: | 53,782 | | Male Population: | 26,389 | | Under 5 years: | 1,848 | | 5 to 9 years: | 1,856 | | 10 to 14 years: | 1,998 | | 15 to 17 years: | 1,263 | | 18 and 19 years: | 778 | | 20 years: | 369 | | 21 years: | 372 | | 22 to 24 years: | 1,064 | | 25 to 29 years: | 1,675 | | 30 to 34 years: | 1,595 | | 35 to 39 years: | 1,583 | | 40 to 44 years: | 1,681 | | 45 to 49 years: | 2,058 | | 50 to 54 years: | 2,128 | | 55 to 59 years: | 1,703 | | 60 and 61 years: | 581 | | 62 to 64 years: | 820 | | 65 and 66 years: | 444 | | 67 to 69 years: | 617 | | 70 to 74 years: | 862 | | 75 to 79 years: | 543 | | 80 to 84 years: | 332 | | 85 years and over: | 219 | | Female Population: | 27,393 | | Under 5 years: | 1,927 | | 5 to 9 years: | 1,802 | | 10 to 14 years: | 1,913 | | 15 to 17 years: | 1,270 | | 18 and 19 years: | 721 | | 20 years: | 349 | | 21 years: | 369 | | 22 to 24 years: | 996 | | 25 to 29 years: | 1,730 | | 30 to 34 years: | 1,591 | | 35 to 39 years: | 1,611 | | 40 to 44 years: | 1,769 | | 45 to 49 years: | 2,261 | | 50 to 54 years: | 2,073 | | 55 to 59 years: | 1,669 | | 60 and 61 years: | 661 | | 62 to 64 years: | 888 | | 65 and 66 years: | 475 | | 67 to 69 years: | 671 | | 70 to 74 years: | 965 | | 75 to 79 years: | 713 | | 80 to 84 years: | 555 | | 85 years and over: | 414 |
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| Average household size in St Mary Parish | | | Total: | 3 | | Under 18 years: | 1 | | 18 years and over: | 2 |
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| Number of occupied homes in St Mary Parish | | | Total: | 20,457 | | Family led homes: | 14,179 | | Husband-wife family: | 9,169 | | Other family: | 5,010 | | Population of male led with no wife present: | 1,322 | | Population female led with no husband present: | 3,688 | | Population of Nonfamily homes: | 6,278 | | Population living alone: | 5,270 | | Population not living alone: | 1,008 |
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| Total occupied homes in St Mary Parish with people under 18 years old: | | | Total: | 20,457 | | Population of homes with one or more people under 18 years: | 7,392 | | Population of family homes: | 7,338 | | Husband-wife family: | 4,076 | | Under 6 years only: | 816 | | Under 6 years and 6 to 17 years: | 904 | | 6 to 17 years only: | 2,356 | | Other family: | 3,262 | | Male householder, no wife present: | 794 | | Under 6 years only: | 218 | | Under 6 years and 6 to 17 years: | 163 | | 6 to 17 years only: | 413 | | Female led with no husband present: | 2,468 | | Under 6 years only: | 560 | | Under 6 years and 6 to 17 years: | 608 | | 6 to 17 years only: | 1,300 | | Nonfamily households: | 54 | | Male led households: | 42 | | Under 6 years only: | 9 | | Under 6 years and 6 to 17 years: | 4 | | 6 to 17 years only: | 29 | | Female led householder: | 12 | | Under 6 years only: | 0 | | Under 6 years and 6 to 17 years: | 0 | | 6 to 17 years only: | 12 | | Households with no people under 18 years: | 13,065 | | Family households: | 6,841 | | Husband-wife family: | 5,093 | | Other family: | 1,748 | | Male led with no wife present: | 528 | | Female led with no husband present: | 1,220 | | Nonfamily households: | 6,224 | | Male led householder: | 3,331 | | Female led householder: | 2,893 |
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| Total number led homes in St Mary Parish, by type | | | Total Home Population: | 20,457 | | Population of Family homes: | 14,179 | | Population of 15 to 24 year olds: | 586 | | Population of 25 to 34 year olds: | 2,151 | | Population of 35 to 44 year olds: | 2,780 | | Population of 45 to 54 year olds: | 3,375 | | Population of 55 to 59 year olds: | 1,360 | | Population of 60 to 64 year olds: | 1,177 | | Population of 65 to 74 year olds: | 1,710 | | Population of 75 to 84 year olds: | 831 | | Population of 85 year olds and over: | 209 | | Population of Nonfamily Homes: | 6,278 | | Population of 15 to 24 year olds: | 311 | | Population of 25 to 34 year olds: | 632 | | Population of 35 to 44 year olds: | 664 | | Population of 45 to 54 year olds: | 1,408 | | Population of 55 to 59 year olds: | 633 | | Population of 60 to 64 year olds: | 633 | | Population of 65 to 74 year olds: | 986 | | Population of 75 to 84 year olds: | 730 | | Population of 85 year olds and over: | 281 |
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| households in St Mary Parish containing people over 60 | | | Total Population: | 20,457 | | Population of homes with one or more people 60 years and over: | 7,157 | | 1-person household: | 2,468 | | 2-or-more-person household: | 4,689 | | Family households: | 4,496 | | Nonfamily households: | 193 | | Population of homes with no people 60 years and over: | 13,300 | | 1-person household: | 2,802 | | 2-or-more-person household: | 10,498 | | Family homes: | 9,683 | | Nonfamily homes: | 815 |
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| homes in St Mary Parish with multiple generations. | | | Total Population: | 20,457 | | Home has three or more generations: | 1,347 | | Home does not have three or more generations: | 19,110 |
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| Unmarried population in St Mary Parish under 18 years old in homes | | | Total Population: | 13,859 | | Unmarried partner of home lead present: | 1,573 | | In family homes: | 1,523 | | Population of male led and male partner homes: | 34 | | Population of male led and female partner households: | 643 | | Population of female led and female partner households: | 50 | | Population of female led and male partner households: | 796 | | In nonfamily homes: | 50 | | Population of male led and male partner homes: | 1 | | Population of male led and female partner homes: | 43 | | Population of female led and female partner homes: | 2 | | Population of female led and male partner homes: | 4 | | No unmarried partner of home lead present: | 12,286 | | In family homes: | 12,257 | | Population of husband-wife family homes: | 7,688 | | Population of male lead with no wife present, family homes: | 671 | | Population of female lead with no husband present, family homes: | 3,898 | | In nonfamily homes: | 29 |
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| Population in families living in St Mary Parish | | | Total Population: | 44,660 | | Population Under 18 years: | 13,659 | | Population 18 years and over: | 31,001 |
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| How long in St Mary Parish have lived in one place. | | | Total: | 20,457 | | Population of Owner occupied homes: | 14,354 | | Family home: | 10,688 | | Nonfamily homess: | 3,666 | | Male led home: | 1,836 | | Living alone: | 1,522 | | Not living alone: | 314 | | Female led home: | 1,830 | | Living alone: | 1,642 | | Not living alone: | 188 | | Population of Renter occupied homes: | 6,103 | | Family run homes: | 3,491 | | Husband-wife family: | 1,446 | | Other family: | 2,045 | | Male led with no wife present: | 484 | | Female led with no husband present: | 1,561 | | Nonfamily Homes: | 2,612 | | Male led homes: | 1,537 | | Male living alone: | 1,190 | | Male not living alone: | 347 | | Female led homes: | 1,075 | | Females living alone: | 916 | | Females not living alone: | 159 |
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