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 growing at a rate of 2.65% annually and its population has increased by 0.87% since the most recent census, which recorded a population of 115 in 2020.

116
Total Population
822
Density (mi²)
3 2.65%
Growth

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)