St. Marys County, MD Population

Overview

113,209

Total Population

36.7

Median age

49.75%

Female population %

101:100

Gender ratio (M:F)

55-59 years

Largest age group

49.0

Total dependency ratio

White

Largest racial group

6,186

Hispanic population

Sources: U.S. Census Bureau, American Community Survey (ACS) 2021

TABLE OF CONTENTS

Age

St. Marys County's population is young compared to the rest of the country:

The median age in St. Marys County is 36.7, compared to 38.8 nationwide, according to the American Community Survey 2017 - 2021 5 Year estimates.
St. Marys County's population under 18 was 24.27%, compared to the 22.51% nationwide.
St. Marys County's elderly or the senior population (over 65 age) was 12.84% as compared to 16.04% nationwide.
Of the total population in St. Marys County, 20.04% were under the age of 15, 20.35% aged 15 to 29, 46.77% aged 30 to 64, 11.42% aged 65 to 84, and 1.42% were 85 years of age and older.

There are 557 less females than males in St. Marys County:

The female percentage in the USA is 50.50% while the male percentage is 49.50%, compared to 49.75% females and 50.25% males in St. Marys County, MD.
The St. Marys County, MD gender ratio is 101:100 i.e. 101 men to 100 women (1.010).
For male population, the largest age group is 55-59 years with a population of 4,330.
For the female population, the largest age group is 10-14 years with a population of 4,260.

St. Marys County's population has become increasingly diverse:

Racial distribution of St. Marys County population: 75.18% are White, 14.11% are Black or African American, 0.05% are American Indian and Alaska Native, 2.50% are Asian, 0.02% are Native Hawaiian and other Pacific Islander, 1.39% are some other race and 6.76% are multiracial.
St. Marys County's racial breakdown clearly shows that there is an absolute majority of White population in the county.
By ethnicity, 6,186 is Hispanic or Latino (of any race), and 107,023 (94.54% of the total population) is Non-Hispanic.
The largest racial group in St. Marys County is White with a population of 85,113 (75.18% of the total population).

St. Marys County's population has not reached its peak yet and is showing a trend of further growth:

The peak population was 114,877 in the year 2022
From 2000 to 2010, St. Marys County's population increased by 19,264 (22.27%), as compared to the national growth of 9.63%.
From 2010 to 2020, St. Marys County's population increased by 8,215 (7.77%), according to Census Bureau's Population Estimates Program. For the same period, the rate of growth for the United States was 7.17%.
Between the year 2000 and 2022, St. Marys County's population was lowest in year 2000 at 86,508.