St. Mary Flag

St. Mary

County:
Hancock County
County Seat:
No
Area (mi²):
36.975
State:
Illinois

St. Mary is located in Hancock County, Illinois. St. Mary has a 2025 population of 547. St. Mary is currently declining at a rate of -0.18% annually and its population has decreased by -2.15% since the most recent census, which recorded a population of 559 in 2020.

The average household income in St. Mary is $65,608 with a poverty rate of 21.93%.The median age in St. Mary is 52.8 years: 49.4 years for males, and 55.2 years for females.

547
Total Population
15
Density (mi²)
-1 -0.18%
Growth

St. Mary Population

St. Mary Population

Data after 2023 is projected based on recent change

Demographics

The racial composition of St. Mary includes 95.76% White, and smaller percentages for Black or African American, Two or more races, other race and multiracial populations.

Population by Race

White (95.8%)

Black or African American (2.1%)

Two or more races (1.8%)

Other race (0.4%)

Race
Population
Percentage (of total)
White65595.76%
Black or African American142.05%
Two or more races121.75%
Other race30.44%

St. Mary Marital Status

OverallMalesFemales0%10%20%30%40%50%60%70%80%90%100%

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

St. Mary's average per capita income is $40,703. Household income levels show a median of $52,727. The poverty rate stands at 21.93%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.
Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.
Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.
Name
Median
Mean
Married Families$93,600-
Families$80,833$80,299
Households$52,727$65,608
Non Families$24,375$32,440

$40,703

Average Income

$52,727

Median Household Income

21.93%

Poverty Rate

Nearby Cities

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)