St. Marys, Pennsylvania Population 2020

12,187

St. Marys is a city located in Pennsylvania. With a 2020 population of 12,187, it is the 52nd largest city in Pennsylvania and the 2685th largest city in the United States. St. Marys is currently declining at a rate of -0.70% annually and its population has decreased by -6.76% since the most recent census, which recorded a population of 13,070 in 2010. St. Marys reached it's highest population of 14,502 in 2000. Spanning over 100 miles, St. Marys has a population density of 123 people per square mile.

The average household income in St. Marys is $69,478 with a poverty rate of 7.70%. The median rental costs in recent years comes to $601 per month, and the median house value is $116,400. The median age in St. Marys is 46.8 years, 44.9 years for males, and 49 years for females. For every 100 females there are 99.4 males.

St. Marys Demographics

According to the most recent ACS, the racial composition of St. Marys was:

  • White: 98.32%
  • Asian: 0.97%
  • Native American: 0.40%
  • Black or African American: 0.17%
  • Two or more races: 0.14%
  • Native Hawaiian or Pacific Islander: 0.00%
  • Other race: 0.00%
The current population of St. Marys, Pennsylvania is 12,187, based on our projections of the latest US Census estimates. The US Census estimates the 2018 population at 12,359.The last official US Census in 2010 recorded the population at 13,070.

St. Marys, Pennsylvania Population 2020

Year Total Population Growth Annual Growth Rate
202029,927-121-0.40%
201930,048-121-0.40%
201830,169-121-0.40%
201730,290-214-0.71%
201630,504-388-1.27%
201530,892-292-0.95%
201431,184-277-0.89%
201331,461-155-0.49%
201231,616-179-0.57%
201131,795-66-0.21%
201031,8610.00%

Population by Race

Race Population Percentage
White12,32598.32%
Asian1220.97%
American Indian and Alaska Native500.40%
Black or African American210.17%
Two or More Races170.14%

St. Marys Population Pyramid 2020

St. Marys Median Age

46.8


Total

44.9


Male

49


Female

St. Marys Adults

There are 10,163 adults, (2,876 of whom are seniors) in St. Marys.

St. Marys Age Dependency

72

Age Dependency Ratio

39.5

Old Age Dependency Ratio

32.6

Child Dependency Ratio

St. Marys Sex Ratio

Female

6,287

50.16%

Male

6,248

49.84%

St. Marys Households and Families

St. Marys Renter vs Owner Occupied by Household Type

St. Marys Household Types

Type Owner Renter
Married94.2%5.8%
All74.7%25.3%
Non Family59.1%40.9%
Male51.7%48.3%
Female51.6%48.4%

74.7%

Rate of Home Ownership

Type Count Average Size Owned
All5,6692.1574.7
Married2,7022.7694.2
Non Family2,0971.1159.1
Male4842.8251.7
Female3862.7351.6

2.67

Average Family Size

2.15

Average Household Size

5.6%

Unmarried (Opposite Sex)

0.1%

Unmarried (Same Sex)

St. Marys Education

Education Attained Count Percentage
Less Than 9th Grade2172.31%
9th to 12th Grade4024.29%
High School Graduate4,56248.64%
Some College1,02610.94%
Associates Degree1,16812.45%
Bachelors Degree1,48115.79%
Graduate Degree5235.58%

St. Marys Educational Attainment by Race

Name Total High School Bachelors
White9,1468,5481,917
Hispanic919149
Asian836234
Native American3838
Multiple Races1717
Black444

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

The highest rate of bachelors degrees is among black people with a rate of 100.00%.

Name Average Male Female
Overall$39,865$45,538$32,096
Less Than High School$22,826$22,436$
High School Grad$35,579$42,743$26,309
Some College$37,009$43,079$30,799
Bachelors Degree$54,615$66,635$41,728
Graduate Degree$54,912$91,818$54,130

$39,865

Average Earnings

$45,538

Average Male

$32,096

Average Female

St. Marys Language

St. Marys Language by Age

St. Marys Language

98.34% of St. Marys residents speak only English, while 1.66% speak other languages. The non-English language spoken by the largest group is Other Indo-European, which is spoken by 1.10% of the population.

St. Marys Poverty

St. Marys Poverty by Race

Name Total In Poverty Poverty Rate
White11,8559247.79%
Native501530.00%

7.70%

Overall Poverty Rate

6.77%

Male Poverty Rate

8.63%

Female Poverty Rate

Poverty in St. Marys

The race most likely to be in poverty in St. Marys is Native, with 30.00% below the poverty level.

The race least likely to be in poverty in St. Marys is White, with 7.79% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 1.99%. Among those working part-time, it was 16.27%, and for those that did not work, the poverty rate was 8.54%.

Name Poverty
Less Than High School13.55%
High School6.88%
Some College4.59%
Bachelors or Greater3.65%
Name Poverty
Female Employed6.65%
Male Employed3.24%
Female Unemployed0.00%
Male Unemployed0.00%

St. Marys Income

St. Marys Income by Household Type

Name Median Mean
Households$51,698$69,478
Families$74,355$85,515
Married Families$86,616-
Non Families$28,647$37,910

St. Marys Marital Status

St. Marys Marital Status

Marriage Rates

53.7%

Overall Marriage Rate

55.6%

Male Marriage Rate

51.9%

Female Marriage Rate

St. Marys Married by Age and Sex

St. Marys 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 55-64.

St. Marys Marital Status by Race

St. Marys Veterans

904

Number of Veterans

827

Male Veterans

77

Female Veterans

War Veterans
Vietnam282
World War II140
Second Gulf War127
Korea86
First Gulf War73

$St. Marys Veterans by Education

8.75%

Veteran Poverty Rate

32.91%

Veteran Disability Rate

St. Marys Employment Status

64.6%

Labor Force Participation

63%

Employment Rate

2.4%

Unemployment Rate

St. Marys Place of Birth

Origin of Non-Citizens

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

Origin of Naturalized Citizens

90.99%

Born in Pennsylvania

98.49%

Native Born

1.51%

Foreign Born

0.40%

Non Citizen

Place of Birth

98.49% of St. Marys residents were born in the United States, with 90.99% having been born in Pennsylvania. 0.40% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Asia.

Year Population Growth Annual Growth Rate
202012,187-86-0.70%
201912,273-86-0.70%
201812,359-48-0.39%
201712,407-86-0.69%
201612,493-150-1.19%
201512,643-129-1.01%
201412,772-105-0.82%
201312,877-56-0.43%
201212,933-77-0.59%
201113,010-22-0.17%
201013,032-1,470-1.06%
200014,5028,99110.16%
19905,511-906-1.51%
19806,417-1,053-1.51%
19707,470-595-0.76%
19608,0652190.28%
19507,8461930.25%
19407,6532200.29%
19307,4334660.65%
19206,9676210.94%
19106,3462,0513.98%
19004,2950.00%