St. Mary Parish, Louisiana Population 2021

St. Mary Parish, Louisiana's estimated population is 48,362 with a growth rate of -1.01% in the past year according to the most recent United States census data. St. Mary Parish, Louisiana is the 23rd largest county in Louisiana. The 2010 Population was 54,550 and has seen a growth of -11.34% since this time.

Note: 2020 and 2021 data is projected
Year Population Growth Growth Rate
202148,362-493-1.01%
202048,855-493-1.00%
201949,348-493-0.99%
201849,841-867-1.71%
201750,708-1,361-2.61%
201652,069-807-1.53%
201552,876-397-0.75%
201453,273-308-0.57%
201353,581190.04%
201253,562-625-1.15%
201154,187-363-0.67%
201054,550-3,536-6.09%
199058,086-6,167-9.60%
198064,2533,5015.76%
197060,75211,91924.41%
196048,83312,98536.22%
195035,8484,39013.96%
194031,4582,0617.01%
193029,397-1,357-4.41%
192030,754-8,614-21.88%
191039,3685,22315.30%
190034,14511,72952.32%
189022,4162,52512.69%
188019,8916,03143.51%
187013,860-2,956-17.58%
186016,8163,11922.77%
185013,6974,74753.04%
18408,9502,50838.93%
18306,4420.00%
2021 Growth Rate
-1.01%
County Website
Founded
1811
County Seat
2010 Population
54,550
Growth Since 2010
-11.34%
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St. Mary Parish, Louisiana Population Growth

Population by Race

Race Population Percentage
White30,01658.89%
Black or African American15,53130.47%
Two or More Races2,1914.30%
Some Other Race1,6493.24%
American Indian and Alaska Native8361.64%
Asian7341.44%
Native Hawaiian and Other Pacific Islander110.02%
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St. Mary Parish, Louisiana Population by Race

St. Mary Parish, Louisiana Population Pyramid $2021

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St. Mary Parish, Louisiana Median Age

39


Total

38.1


Male

39.8


Female

St. Mary Parish, Louisiana Adults

There are 38,625 adults, (8,193 of whom are seniors) in St. Mary Parish, Louisiana.

St. Mary Parish, Louisiana Age Dependency

67.5

Age Dependency Ratio

26.9

Old Age Dependency Ratio

40.6

Child Dependency Ratio

St. Mary Parish, Louisiana Sex Ratio

Female

25,757

50.54%

Male

25,211

49.46%

St. Mary Parish, Louisiana Population by Age

St. Mary Parish, Louisiana Renter vs Owner Occupied by Household Type

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St. Mary Parish, Louisiana Household Types

Type Owner Renter
Married80.8%19.2%
Male64.1%35.9%
All60.7%39.3%
Female57.9%42.1%
Non Family43.4%56.6%

60.7%

Rate of Home Ownership

St. Mary Parish, Louisiana Households and Families

Type Count Average Size Owned
All19,8562.5260.7
Non Family8,5021.1443.4
Married7,5173.3780.8
Female2,6724.1857.9
Male1,1653.3864.1

3.49

Average Family Size

2.52

Average Household Size

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St. Mary Parish, Louisiana Households by Type

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Education Attained Count Percentage
Less Than 9th Grade2,0455.93%
9th to 12th Grade3,88711.26%
High School Graduate17,59750.99%
Some College5,15714.94%
Associates Degree2,2936.64%
Bachelors Degree2,4197.01%
Graduate Degree1,1123.22%
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St. Mary Parish, Louisiana Educational Attainment by Sex (over 25)

St. Mary Parish, Louisiana Educational Attainment by Race

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Race Total High School Bachelors
White20,55417,6462,504
Black10,3548,352836
Hispanic2,0421,441114
Other Race1,12175910
Asian60435344
Native American54844918
2+ Races46540135
Islander11116

The highest rate of high school graduation is among islander people with a rate of 100.00%.

The highest rate of bachelors degrees is among islander people with a rate of 54.55%.

St. Mary Parish, Louisiana Educational Attainment by Race

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Name Average Male Female
Overall$37,586$48,211$28,520
Less Than 9th Grade$25,169$36,105$16,845
High School Graduate$38,953$49,129$29,073
Some College$32,337$50,373$23,022
Bachelors Degree$43,103$53,173$40,401
Graduate Degree$46,191$53,125$45,755

$37,586

Average Earnings

$48,211

Average Male

$28,520

Average Female

St. Mary Parish, Louisiana Earnings by Educational Attainment

St. Mary Parish, Louisiana Language by Age

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St. Mary Parish, Louisiana Language

91.53% of St. Mary Parish, Louisiana residents speak only English, while 8.47% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 4.75% of the population.

St. Mary Parish, Louisiana Language

St. Mary Parish, Louisiana Poverty by Race

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Name Total In Poverty Poverty Rate
White28,2074,71516.72%
Black15,1173,59923.81%
Hispanic3,57366518.61%
Multiple2,14462929.34%
Other1,64930418.44%
Asian73426636.24%
Native82713015.72%
Islander11981.82%

19.73%

Overall Poverty Rate

18.71%

Male Poverty Rate

20.72%

Female Poverty Rate

Poverty in St. Mary Parish, Louisiana

The race most likely to be in poverty in St. Mary Parish, Louisiana is Islander, with 81.82% below the poverty level.

The race least likely to be in poverty in St. Mary Parish, Louisiana is Native, with 15.72% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 3.08%. Among those working part-time, it was 19.21%, and for those that did not work, the poverty rate was 31.00%.

St. Mary Parish, Louisiana Poverty

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Name Poverty
Less Than 9th Grade27.19%
High School18.52%
Some College13.78%
Bachelors or Greater8.60%

St. Mary Parish, Louisiana Poverty Rate by Education

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Rate Poverty
Female Unemployed35.48%
Male Unemployed25.10%
Female Employed9.41%
Male Employed5.13%

St. Mary Parish, Louisiana Poverty Rate by Employment Status and Sex

St. Mary Parish, Louisiana Income by Household Type

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Name Median Mean
Households$40,485$54,359
Families$50,871$68,775
Married Families$67,017-
Non Families$28,920$33,673
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Income by Household Type

St. Mary Parish, Louisiana Marital Status

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Marriage Rates

39.4%

Overall Marriage Rate

41.6%

Male Marriage Rate

37.3%

Female Marriage Rate

St. Mary Parish, Louisiana Married by Age and Sex

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St. Mary Parish, Louisiana Marriage

The age group where males are most likely to be married is 55-64, while the female age group most likely to be married is 45-54.

St. Mary Parish, Louisiana Marital Status by Race

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St. Mary Parish, Louisiana Marital Status

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2,114

Number of Veterans

1,953

Male Veterans

161

Female Veterans

War Veterans
Vietnam966
First Gulf War400
Second Gulf War161
Korea148
World War II47

St. Mary Parish, Louisiana Veterans by War

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Age Group Veterans
65 to 74745
75+566
35 to 54491
55 to 64281
18 to 3431

St. Mary Parish, Louisiana Veterans by Age

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Name Veterans % of Total
White1,5126.41%
Black5414.57%
Hispanic1004.36%
2+ Races233.82%
Native American233.85%
Other Race100.80%
Asian50.75%

St. Mary Parish, Louisiana Veterans by Race

St. Mary Parish, Louisiana Veterans by Education

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11.91%

Veteran Poverty Rate

41.13%

Veteran Disability Rate

St. Mary Parish, Louisiana Veterans by Education

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52.8%

Labor Force Participation

48%

Employment Rate

8.7%

Unemployment Rate

St. Mary Parish, Louisiana Employment by Age

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St. Mary Parish, Louisiana Employment by Race

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St. Mary Parish, Louisiana Employment by Education

Origin of Non-Citizens

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Non citizens include legal permanent residents (green card holders), international students, temporary workers, humanitarian migrants, and illegal immigrants.

Origin of Naturalized Citizens

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85.80%

Born in St. Mary Parish, Louisiana

95.96%

Native Born

4.04%

Foreign Born

2.76%

Non Citizen

1.28%

Naturalized

Place of Birth

95.96% of St. Mary Parish, Louisiana residents were born in the United States, with 85.80% having been born in Louisiana. 2.76% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Latin America.

St. Mary Parish, Louisiana Place of Birth

  1. US Census City/Town Population estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. Population of States and Counties of the United States: 1790 - 1990

Sources