St. Mary's County, Maryland Population 2019

St. Mary's County, Maryland's estimated population is 112,413 with a growth rate of 0.65% 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.

Year Population Growth Growth Rate
2018112,6642510.22%
2017112,4137240.65%
2016111,6897240.65%
2015110,9651,0390.95%
2014109,9266980.64%
2013109,2284230.39%
2012108,8051,2471.16%
2011107,5581,7961.70%
2010105,76229,78839.21%
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%
179015,5440.00%

St. Mary's County, Maryland Population Growth

Population Data via

Population by Race

Race Population
White87,485
Black or African American15,922
Two or More Races3,561
Asian3,079
Some Other Race684
American Indian and Alaska Native220
Native Hawaiian and Other Pacific Islander28

St. Mary's County, Maryland Population Pyramid 2019

St. Mary's County, Maryland Median Age

36.5


Total

36.1


Male

36.9


Female

St. Mary's County, Maryland Adults

There are 83,491 adults, (13,184 of whom are seniors) in St. Mary's County, Maryland.

St. Mary's County, Maryland Age Dependency

57.8

Age Dependency Ratio

18.8

Old Age Dependency Ratio

39.1

Child Dependency Ratio

St. Mary's County, Maryland Sex Ratio

Female

55,559

50.06%

Male

55,420

49.94%

St. Mary's County, Maryland Households and Families

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

St. Mary's County, Maryland Household Types

Type Owner Renter
Married84.8%15.2%
All71.9%28.1%
Male69.3%30.7%
Non Family57.9%42.1%
Female48.7%51.3%

71.9%

Rate of Home Ownership

Type Count Average Size Owned
All39,2762.7571.9
Married21,5833.3684.8
Non Family11,6301.2857.9
Female4,7293.4548.7
Male1,3343.2469.3

3.29

Average Family Size

2.75

Average Household Size

6.1%

Unmarried (Opposite Sex)

0.1%

Unmarried (Same Sex)

St. Mary's County, Maryland Education

Education Attained Count Percentage
Less Than 9th Grade2,4043.29%
9th to 12th Grade5,1257.02%
High School Graduate21,77629.82%
Some College15,54321.28%
Associates Degree5,9518.15%
Bachelors Degree13,00917.81%
Graduate Degree9,22312.63%

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

Name Total High School Bachelors
White56,64452,29618,519
Black10,2128,0081,335
Hispanic2,9352,374941
Asian2,2471,9431,185
Multiple Races985905304
Other Race487382145
Native American19215823
Islander111111

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%.

Name Average Male Female
Overall$54,379$69,864$40,154
Less Than High School$27,352$30,256$24,098
High School Grad$41,609$50,549$31,059
Some College$51,790$66,831$37,470
Bachelors Degree$78,692$94,963$51,324
Graduate Degree$94,932$111,463$69,185

$54,379

Average Earnings

$69,864

Average Male

$40,154

Average Female

St. Mary's County, Maryland Language

St. Mary's County, Maryland Language by Age

St. Mary's County, Maryland Language

93.10% of St. Mary's County, Maryland residents speak only English, while 6.90% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 2.64% of the population.

St. Mary's County, Maryland Poverty

St. Mary's County, Maryland Poverty by Race

Name Total In Poverty Poverty Rate
White81,0984,6305.71%
Black15,2822,82218.47%
Hispanic5,25262311.86%
Multiple3,48660417.33%
Asian3,0022247.46%
Other675598.74%

8.20%

Overall Poverty Rate

6.37%

Male Poverty Rate

10.00%

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 18.47% below the poverty level.

The race least likely to be in poverty in St. Mary's County, Maryland is White, with 5.71% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 1.25%. Among those working part-time, it was 10.14%, and for those that did not work, the poverty rate was 16.13%.

Name Poverty
Less Than High School18.05%
High School10.27%
Some College5.03%
Bachelors or Greater1.11%
Name Poverty
Female Unemployed30.22%
Male Unemployed16.33%
Female Employed4.36%
Male Employed1.93%

St. Mary's County, Maryland Income

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

Name Median Mean
Households$86,508$101,264
Families$101,941$114,730
Married Families$115,252$130,274
Non Families$54,846$64,140

St. Mary's County, Maryland Marital Status

St. Mary's County, Maryland Marital Status

Marriage Rates

51.9%

Overall Marriage Rate

53.2%

Male Marriage Rate

50.7%

Female Marriage Rate

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

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 35-44.

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

St. Mary's County, Maryland Veterans

10,472

Number of Veterans

9,302

Male Veterans

1,170

Female Veterans

War Veterans
First Gulf War4,332
Second Gulf War3,626
Vietnam2,958
Korea498
World War II265

St. Mary's County, Maryland Veterans by Race

Name Veterans % of Total
White9,04413.82%
Black9688.18%
Hispanic55716.12%
Asian1757.46%
2 or More14711.79%
Other11423.80%
Indian2412.50%

St. Mary's County, Maryland Veterans by Education

2.37%

Veteran Poverty Rate

17.84%

Veteran Disability Rate

St. Mary's County, Maryland Employment Status

67.4%

Labor Force Participation

62.4%

Employment Rate

4.2%

Unemployment Rate

Population of Cities in St. Mary's County, Maryland

  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