St. Marys Population

1810–2026

20,940

2026 projection

13.1% since 2020 (increase)

05K10K15K20K25K1850190019502000

Source: U.S. Census Bureau decennial counts and annual estimates. 2026 is a projection. Values between recorded years are interpolated.

Use the left and right arrow keys to inspect population observations.

Population by year

Population estimates for St. Marys. Annual change is shown as a percentage. Growth is the total change since the preceding observation.
202620,940+3941.92%
202520,546+4482.23%
202420,098+5802.97%
202319,518+5172.72%
202219,001+3551.90%
202118,646+1250.67%
202018,521-680.37%
201918,589+3812.09%
201818,208+1230.68%
201718,085+1590.89%

Showing 10 of 34 years.

St. Marys Demographics

33.8median age

Median age

Female35.2 yrs
Male31.4 yrs

Adults

14,081
3,250 seniors · 23%10,831 other adults

Sex

Female 49.2% · 9,427Male 50.8% · 9,739

U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101

Race and ethnicity

Tap a square or a group below to highlight it.

Each square is about 1% of residents (roughly 192 people).

Hispanic or Latino residents can be of any race. All other groups exclude Hispanic residents.

U.S. Census Bureau, 2024 ACS 5-year estimates · Table B03002

St. Marys Income

$74,288median household income

Median household income

$74,288

Half of households earn more, half earn less

Median earnings

$51,033

Typical yearly pay for a worker 25 or older.

Poverty rate

17.4%

About 1 in 6 residents

U.S. Census Bureau, 2024 ACS 5-year estimates · Tables S1901, S1501, S1701

St. Marys Marital Status

48% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married48%48%49%
Never married32%39%24%
Divorced13%10%17%
Widowed5%2%10%
Separated1%2%<1%

U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201