St. Mary's County, Maryland Population 2024

115,303

St. Mary's County, Maryland's estimated 2024 population is 115,303 with a growth rate of 0.19% in the past year according to the most recent United States census data. St. Mary's County, Maryland is the 12th largest county in Maryland. The 2010 population was 105,772 and has seen a growth of 9.01% since that time.

Note: data after 2022 is projected based on recent change

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Year
Population
Growth
Growth Rate
2029116,3682130.18%
2028116,1552130.18%
2027115,9422130.18%
2026115,7292130.18%
2025115,5162130.18%
2024115,3032130.19%
2023115,0902130.19%
2022114,8772130.19%
2021114,6646770.59%
2020113,9872230.2%
2019113,7648160.72%
2018112,9483210.29%
2017112,6277410.66%
2016111,8867940.71%
2015111,0921,0940.99%
2014109,9987140.65%
2013109,2844370.4%
2012108,8471,2581.17%
2011107,5891,8171.72%
2010105,772
199075,97416,07926.85%
198059,89512,50726.39%
197047,3888,47321.77%
196038,9159,80433.68%
195029,11114,48599.04%
194014,626-563-3.71%
193015,189-923-5.73%
192016,112-918-5.39%
191017,030-152-0.88%
190017,1821,3638.62%
189015,819-1,115-6.58%
188016,9341,99013.32%
187014,944-269-1.77%
186015,2131,51511.06%
185013,6984743.58%
184013,224-235-1.75%
183013,4594853.74%
182012,9741801.41%
181012,794-905-6.61%
180013,699-1,845-11.87%
179015,544-100,824-86.64%
showing: 41 rows
2024 Growth Rate
0.19% (213)
County Website
St. Mary's County
County Seat
2020 Population
113,987
Area
357 mi²
Density
323 people/mi²
Growth Since 2020
1.15% (1,316)
Founded
January 24, 1637

St. Mary's County, Maryland Population 2024

Population by Race

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Race
Population
Percentage (of total)
White83,76473.6%
Black or African American16,41114.42%
Two or more races8,6907.64%
Asian2,8392.49%
Other race2,0431.8%
Native American670.06%
Native Hawaiian or Pacific Islander
showing: 7 rows

White

Black or African American

Two or more races

Asian

Other race

Native American

Native Hawaiian or Pacific Islander

St. Mary's County, Maryland Population by Race

St. Mary's County, Maryland Population Pyramid 2024

St. Mary's County, Maryland Median Age

37

Total

36.2

Male

38

Female

St. Mary's County, Maryland Adults

There are 86,553 adults, (15,170 of whom are seniors) in St. Mary's County, Maryland.

St. Mary's County, Maryland Age Dependency

59.4

Age Dependency Ratio

21.3

Old Age Dependency Ratio

38.2

Child Dependency Ratio

St. Mary's County, Maryland Sex Ratio

Female56,40649.56%
Male57,40850.44%

St. Mary's County, Maryland Population by Age

St. Mary's County, Maryland Renter vs Owner Occupied by Household Type

Household Type
Count
Average Size
Owner
Renter
All41,2112.772.527.5
Married22,0003.3585.814.2
Non Family12,0741.2857.842.2
Female5,3043.1150.949.1
Male1,8333.0671.628.4
showing: 5 rows

3.2

Average Family Size

2.7

Average Household Size

72.5%

Rate of Home Ownership

Married

Male

Female

NonFamily

owner

renter

St. Mary's County, Maryland Households and Families

Male

Female

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Less Than 9th Grade

9th to 12th Grade

High School Graduate

Some College

Associates Degree

Bachelors Degree

Graduate Degree

St. Mary's County, Maryland Educational Attainment by Sex (over 25)

St. Mary's County, Maryland Educational Attainment by Race

High School Graduation Rate

Bachelors Rate

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The highest rate of high school graduation is among 2+ races people with a rate of 95.12%.

The highest rate of bachelors degrees is among asian people with a rate of 48%.

St. Mary's County, Maryland Educational Attainment by Race

All

Male

Female

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$70,421

Average Earnings

$84,776

Average Male

$54,190

Average Female

St. Mary's County, Maryland Earnings by Educational Attainment

St. Mary's County, Maryland Language by Age

Only English

Spanish

Other Indo-European Languages

Asian and Pacific Island Languages

Other Languages

St. Mary's County, Maryland Language

93.02% of St. Mary's County, Maryland residents speak only English, while 6.98% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 3.06% of the population.

St. Mary's County, Maryland Language

St. Mary's County, Maryland Poverty by Race

rate

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Name
Total
In Poverty
Poverty Rate
White79,9804,6245.78%
Black15,9252,41115.14%
Multiple8,5536547.65%
Hispanic6,3334376.9%
Other2,03136918.17%
Asian2,7831485.32%
showing: 6 rows

7.59%

Overall Poverty Rate

6.93%

Male Poverty Rate

8.26%

Female Poverty Rate

Poverty in St. Mary's County, Maryland

The race most likely to be in poverty in St. Mary's County, Maryland is Other, with 18.17% below the poverty level.

The race least likely to be in poverty in St. Mary's County, Maryland is Asian, with 5.32% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 1.75%. Among those working part-time, it was 9.06%, and for those that did not work, the poverty rate was 16.47%.

St. Mary's County, Maryland Poverty

rate

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Rate
Poverty
Less Than 9th Grade22.26%
High School9.52%
Some College6.49%
Bachelors or Greater1.73%
showing: 4 rows

St. Mary's County, Maryland Poverty Rate by Education

rate

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Rate
Poverty
Male Unemployed29.48%
Female Unemployed24.25%
Female Employed5.03%
Male Employed2.02%
showing: 4 rows

St. Mary's County, Maryland Poverty Rate by Employment Status and Sex

St. Mary's County, Maryland Income by Household Type

Households

Families

MarriedFamilies

NonFamilies

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mean

median

Income by Household Type

St. Mary's County, Maryland Marital Status

Married

Widowed

Divorced

Separated

NeverMarried

Marriage Rates

50.9%

Overall Marriage Rate

51.5%

Male Marriage Rate

50.3%

Female Marriage Rate

St. Mary's County, Maryland Married by Age and Sex

male

female

St. Mary's County, Maryland Marriage

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

St. Mary's County, Maryland Marital Status by Race

Married

Widowed

Divorced

Separated

NeverMarried

St. Mary's County, Maryland Marital Status

Second Gulf War

First Gulf War

Vietnam

Korea

World War II

11,968

Number of Veterans

10,300

Male Veterans

1,668

Female Veterans

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St. Mary's County, Maryland Veterans by War

count

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St. Mary's County, Maryland Veterans by Age

count

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St. Mary's County, Maryland Veterans by Race

St. Mary's County, Maryland Veterans by Education

Less Than 9th Grade

High School Graduate

Some College

Bachelors or Greater

3.78%

Veteran Poverty Rate

18.28%

Veteran Disability Rate

St. Mary's County, Maryland Veterans by Education

LaborForceParticipation

68.4%

Labor Force Participation

63.7%

Employment Rate

3.7%

Unemployment Rate

St. Mary's County, Maryland Employment by Age

LaborForceParticipation

St. Mary's County, Maryland Employment by Race

LaborForceParticipation

St. Mary's County, Maryland Employment by Education

Origin of Non-Citizens

Europe

Asia

Africa

Oceania

Latin America

North America

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

Origin of Naturalized Citizens

Europe

Asia

Africa

Oceania

Latin America

North America

48.79%

Born in St. Mary's County, Maryland

94.98%

Native Born

5.02%

Foreign Born

2.41%

Non Citizen

2.61%

Naturalized

Place of Birth

94.98% of St. Mary's County, Maryland residents were born in the United States, with 48.79% having been born in Maryland. 2.41% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Asia.

St. Mary's County, Maryland Place of Birth

Sources