Demographics
Historical population| Census | Pop. | Note | %± |
|---|
| 1830 | 6,442 | | — |
|---|
| 1840 | 8,950 | | 38.9% |
|---|
| 1850 | 13,697 | | 53.0% |
|---|
| 1860 | 16,816 | | 22.8% |
|---|
| 1870 | 13,860 | | −17.6% |
|---|
| 1880 | 19,891 | | 43.5% |
|---|
| 1890 | 22,416 | | 12.7% |
|---|
| 1900 | 34,145 | | 52.3% |
|---|
| 1910 | 39,368 | | 15.3% |
|---|
| 1920 | 30,754 | | −21.9% |
|---|
| 1930 | 29,397 | | −4.4% |
|---|
| 1940 | 31,458 | | 7.0% |
|---|
| 1950 | 35,848 | | 14.0% |
|---|
| 1960 | 48,833 | | 36.2% |
|---|
| 1970 | 60,752 | | 24.4% |
|---|
| 1980 | 64,253 | | 5.8% |
|---|
| 1990 | 58,086 | | −9.6% |
|---|
| 2000 | 53,500 | | −7.9% |
|---|
| 2010 | 54,650 | | 2.1% |
|---|
| 2020 | 49,406 | | −9.6% |
|---|
|
St. Mary Parish, Louisiana – Racial and ethnic composition
Note: the US Census treats Hispanic/Latino as an ethnic category. This table excludes Latinos from the racial categories and assigns them to a separate category. Hispanics/Latinos may be of any race.| Race / Ethnicity (NH = Non-Hispanic) | Pop 1980 [11] | Pop 1990 [12] | Pop 2000 [13] | Pop 2010 [14] | Pop 2020 [15] | % 1980 | % 1990 | % 2000 | % 2010 | % 2020 |
|---|
| White alone (NH) | 43,480 | 36,883 | 33,051 | 31,267 | 26,334 | 67.67% | 63.50% | 61.78% | 57.21% | 53.30% |
| Black or African American alone (NH) | 18,241 | 18,262 | 16,945 | 17,648 | 14,950 | 28.39% | 31.44% | 31.67% | 32.29% | 30.26% |
| Native American or Alaska Native alone (NH) | 388 | 820 | 725 | 933 | 911 | 0.60% | 1.41% | 1.36% | 1.71% | 1.84% |
| Asian alone (NH) | 528 | 969 | 854 | 935 | 647 | 0.82% | 1.67% | 1.60% | 1.71% | 1.31% |
| Native Hawaiian or Pacific Islander alone (NH) | x [16] | x [17] | 8 | 11 | 13 | x | x | 0.01% | 0.02% | 0.03% |
| Other race alone (NH) | 44 | 24 | 46 | 83 | 179 | 0.07% | 0.04% | 0.09% | 0.15% | 0.36% |
| Mixed race or Multiracial (NH) | x [18] | x [19] | 719 | 853 | 1,848 | x | x | 1.34% | 1.56% | 3.74% |
| Hispanic or Latino (any race) | 1,572 | 1,128 | 1,152 | 2,920 | 4,524 | 2.45% | 1.94% | 2.15% | 5.34% | 9.16% |
| Total | 64,253 | 58,086 | 53,500 | 54,650 | 49,406 | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% |
As of the 2020 United States census, there were 49,406 people, 19,856 households, and 11,354 families residing in the parish. As of the census [20] of 2000, there were 53,500 people, 19,317 households, and 14,082 families residing in the parish. The population density was 87 people per square mile (34 people/km2). There were 21,650 housing units at an average density of 35 per square mile (14/km2). The racial makeup of the parish was 62.79% White, 31.79% Black or African American, 1.39% Native American, 1.64% Asian, 0.02% Pacific Islander, 0.88% from other races, and 1.50% from two or more races. 2.15% of the population were Hispanic or Latino of any race. 5.43% reported speaking French or Cajun French at home, while 2.45% speak Spanish and 1.59% Vietnamese.
There were 19,317 households, out of which 36.70% had children under the age of 18 living with them, 51.00% were married couples living together, 16.50% had a female householder with no husband present, and 27.10% were non-families. 23.20% of all households were made up of individuals, and 8.70% had someone living alone who was 65 years of age or older. The average household size was 2.74 and the average family size was 3.23.
In the parish the population was spread out, with 29.70% under the age of 18, 8.70% from 18 to 24, 28.70% from 25 to 44, 21.90% from 45 to 64, and 11.00% who were 65 years of age or older. The median age was 34 years. For every 100 females there were 95.00 males. For every 100 females age 18 and over, there were 92.20 males.
The median income for a household in the parish was $28,072, and the median income for a family was $33,064. Males had a median income of $31,570 versus $18,341 for females. The per capita income for the parish was $13,399. About 20.60% of families and 23.60% of the population were below the poverty line, including 31.30% of those under age 18 and 19.00% of those age 65 or over.
Politics
St. Mary Parish was a swing parish between 1932 and 2004, when it only voted for losing presidential candidates in 1948, 1968, and 1980, with none of these candidates receiving a majority. Since 2008, the parish has become more Republican leaning, with Donald Trump breaking 60% of the vote in all his runs.
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