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 2026 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 median household income in St. Marys is $77,500 with a poverty rate of 8.33%. The median age in St. Marys is 55.5 years: 53.7 years for males, and 57.5 years for females. For every 100 females there are 118.2 males.

116
Total Population
822
Density (mi²)

St. Marys Population

St. Marys Population

Data after 2023 is projected based on recent change

Year ↓
Population
Growth
Annual Change
202611600%
202511600%
202411632.65%
202311300%
2022113-1-0.88%
2021114-1-0.87%
202011500%
201912721.6%
201812510.81%
2017124-1-0.8%
2016125-2-1.57%
201512710.79%
2014126-1-0.79%
201312700%
201212700%
201112700%
201012700%

Median Age

Overall: 55.5 years
Female: 57.5 years
Male: 53.7 years

St. Marys Adults

There are 93 adults, (23 of whom are seniors) in St. Marys.

Sex Ratio

Female: 44 (45.8%)
Male: 52 (54.2%)

Demographics

The racial composition of St. Marys includes 97.92% White, and smaller percentages for Two or more races and multiracial populations.

Population by Race

Race
Population ↓
Percentage (of total)
White9497.92%
Two or more races22.08%
Race
Population ↓
Percentage (of total)
White9497.92%
Two or more races22.08%

St. Marys Marital Status

Economics and Income Statistics

St. Marys ' average per capita income is $69,583. Household income levels show a median of $77,500. The poverty rate stands at 8.33%.

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
Families$131,250$132,754
Married Families$131,250-
Households$77,500$94,134
Non Families-$26,550

$69,583

Average Income

$77,500

Median Household Income

8.33%

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)