St. Marys Flag

St. Marys

County:
Warren County
County Seat:
No
Area (mi²):
0.141
State:
Iowa

St. Marys is a city located in Warren County, Iowa. St. Marys has a 2025 population of 116 . St. Marys is currently declining at a rate of 0% annually and its population has increased by 0.87% since the most recent census, which recorded a population of 115 in 2020.

The average household income in St. Marys is $98,094 with a poverty rate of 6.25%. The median age in St. Marys is 53.5 years: 53.6 years for males, and 53.5 years for females. For every 100 females there are 128.6 males.

116
Total Population
822
Density (mi²)

St. Marys Population

St. Marys Population

Data after 2023 is projected based on recent change

Demographics

The racial composition of St. Marys includes 100% White, and smaller percentages for and multiracial populations.

Population by Race

White (100%)

Race
Population
Percentage (of total)
White112100%

St. Marys Marital Status

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

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

St. Marys' average per capita income is $70,000. Household income levels show a median of $78,750. The poverty rate stands at 6.25%.

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$106,250-
Households$78,750$98,094
Non Families$68,750$59,950
Families-$118,094

$70,000

Average Income

$78,750

Median Household Income

6.25%

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)