St. Mary's County, Maryland Population 2022

St. Mary's County, Maryland's estimated population is 115,880 with a growth rate of 0.69% in the past year according to the most recent United States census data. St. Mary's County, Maryland is the 13th largest county in Maryland. The 2010 Population was 105,761 and has seen a growth of 9.57% since this time.

Note: 2021 and 2022 data is projected
Year Population Growth Annual Growth Rate
179015,5440.00%
180013,699-1,845-11.87%
181012,794-905-6.61%
182012,9741801.41%
183013,4594853.74%
184013,224-235-1.75%
185013,6984743.58%
186015,2131,51511.06%
187014,944-269-1.77%
188016,9341,99013.32%
189015,819-1,115-6.58%
190017,1821,3638.62%
191017,030-152-0.88%
192016,112-918-5.39%
193015,189-923-5.73%
194014,626-563-3.71%
195029,11114,48599.04%
196038,9159,80433.68%
197047,3888,47321.77%
198059,89512,50726.39%
199075,97416,07926.85%
2010105,76129,78739.21%
2011107,5661,8051.71%
2012108,8001,2341.15%
2013109,2244240.39%
2014109,9136890.63%
2015110,9851,0720.98%
2016111,7507650.69%
2017112,4877370.66%
2018112,7202330.21%
2019113,5107900.70%
2020114,3007900.70%
2021115,0907900.69%
2022115,8807900.69%
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St. Mary's County, Maryland Population Growth

Population by Race

Race Population Percentage
White86,78176.67%
Black or African American16,34814.44%
American Indian and Alaska Native670.06%
Asian2,9362.59%
Native Hawaiian and Other Pacific Islander210.02%
Some Other Race1,1461.01%
Two or More Races5,8835.20%
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St. Mary's County, Maryland Population by Race

St. Mary's County, Maryland Population Pyramid 2022

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St. Mary's County, Maryland Median Age

36.5


Total

36


Male

37.5


Female

St. Mary's County, Maryland Adults

There are 85,771 adults, (14,531 of whom are seniors) in St. Mary's County, Maryland.

St. Mary's County, Maryland Age Dependency

Age Dependency Ratio

20.4

Old Age Dependency Ratio

38.5

Child Dependency Ratio

St. Mary's County, Maryland Sex Ratio

Female

56,632

50.04%

Male

56,550

49.96%

St. Mary's County, Maryland Population by Age

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

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St. Mary's County, Maryland Household Types

Type Owner Renter
Married84%16%
All70.3%29.7%
Male61%39%
Non Family55.6%44.4%
Female49.5%50.5%

70.3%

Rate of Home Ownership

St. Mary's County, Maryland Households and Families

Type Count Average Size Owned
All41,2802.6770.3
Married22,2233.3284
Male1,7073.0261
Female5,5473.0349.5
Non Family11,8031.2455.6

3.16

Average Family Size

2.67

Average Household Size

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St. Mary's County, Maryland Households by Type

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Education Attained Count Percentage
Less Than 9th Grade2,6123.47%
9th to 12th Grade4,6376.16%
High School Graduate22,96230.52%
Some College14,61819.43%
Associates Degree6,2898.36%
Bachelors Degree13,95718.55%
Graduate Degree10,15013.49%
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St. Mary's County, Maryland Educational Attainment by Sex (over 25)

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

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Race Total High School Bachelors
Islander212121
Asian2,2441,750887
2+ Races2,7492,6791,079
White57,41453,18320,103
Hispanic3,1552,507829
Other Race603331134
Black10,3668,5691,416
Native American3829

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 100.00%.

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

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Name Average Male Female
Overall$60,146$72,456$44,528
Less Than 9th Grade$33,067$38,199$28,798
High School Graduate$41,535$53,095$33,399
Some College$57,553$66,518$41,870
Bachelors Degree$83,375$99,070$60,486
Graduate Degree$99,630$127,023$78,207

$60,146

Average Earnings

$72,456

Average Male

$44,528

Average Female

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

St. Mary's County, Maryland Language by Age

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St. Mary's County, Maryland Language

92.87% of St. Mary's County, Maryland residents speak only English, while 7.13% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 3.03% of the population.

St. Mary's County, Maryland Language

St. Mary's County, Maryland Poverty by Race

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Name Total In Poverty Poverty Rate
Black15,7182,63816.78%
Multiple5,75965611.39%
Hispanic5,9134397.42%
White81,2184,9616.11%
Asian2,8141063.77%
Other159NaN%

8.03%

Overall Poverty Rate

6.80%

Male Poverty Rate

9.25%

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 Black, with 16.78% below the poverty level.

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

The poverty rate among those that worked full-time for the past 12 months was 1.77%. Among those working part-time, it was 11.16%, and for those that did not work, the poverty rate was 14.77%.

St. Mary's County, Maryland Poverty

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Name Poverty
Less Than 9th Grade15.02%
High School10.23%
Some College7.49%
Bachelors or Greater1.37%

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

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Rate Poverty
Male Employed2.35%
Male Unemployed25.91%
Female Employed5.81%
Female Unemployed23.44%

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

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

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Name Median Mean
Households$95,864$111,381
Families$110,946$123,473
Married Families$127,866$141,570
Non Families$60,170$74,114
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Income by Household Type

St. Mary's County, Maryland Marital Status

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Marriage Rates

51.8%

Overall Marriage Rate

53.0%

Male Marriage Rate

50.5%

Female Marriage Rate

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

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St. Mary's County, Maryland 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 35-44.

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

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St. Mary's County, Maryland Marital Status

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11,411

Number of Veterans

Male Veterans

Female Veterans

War Veterans
Second Gulf War4,731
First Gulf War5,246
Vietnam2,793
Korea200
World War II66

St. Mary's County, Maryland Veterans by War

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Age Group Veterans
18 to 341,102
35 to 544,506
55 to 642,596
65 to 741,673
75+1,534

St. Mary's County, Maryland Veterans by Age

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Name Veterans % of Total
White9,37014.33%
Black1,37411.44%
Asian582.41%
Other Race14816.86%
2+ Races46115.91%
Hispanic56014.49%

St. Mary's County, Maryland Veterans by Race

St. Mary's County, Maryland Veterans by Education

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3.37%

Veteran Poverty Rate

16.35%

Veteran Disability Rate

St. Mary's County, Maryland Veterans by Education

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67.5%

Labor Force Participation

62.8%

Employment Rate

3.5%

Unemployment Rate

St. Mary's County, Maryland Employment by Age

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St. Mary's County, Maryland Employment by Race

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St. Mary's County, Maryland 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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49.97%

Born in St. Mary's County, Maryland

94.82%

Native Born

5.18%

Foreign Born

2.46%

Non Citizen

2.72%

Naturalized

Place of Birth

94.82% of St. Mary's County, Maryland residents were born in the United States, with 49.97% having been born in Maryland. 2.46% 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

  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