Iowa Gazetteer
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The City of Saint Marys had a population of 113 as of July 1, 2025.
The primary coordinate point for Saint Marys is located at latitude 41.308 and longitude -93.7297 in Warren County. The formal boundaries for the City of Saint Marys encompass a land area of 0.14 sq. miles and a water area of 0 sq. miles. Warren County is in the Central time zone (GMT -6).
The City of Saint Marys has a C1 Census Class Code which indicates an active incorporated place that does not serve as a county subdivision equivalent. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.
The City of Saint Marys is located within Township of Jackson, a minor civil division (MCD) of Warren County.
POPULATION | |
|---|---|
| Total Population | 113 (100%) |
| Population in Households | 113 (100.0%) |
| Population in Families | 103 (91.2%) |
| Population in Group Quarters1 | 0 |
| Population Density | 800 |
| Diversity Index2 | 21 |
INCOME | |
| Median Household Income | $152,658 |
| Average Household Income | $144,065 |
| % of Income for Mortgage4 | 0% |
| Per Capita Income | $59,921 |
| Wealth Index5 | 166 |
| Socioeconomic Status Index6 | High (72.6) |
HOUSING | |
|---|---|
| Total HU (Housing Units) | 48 (100%) |
| Owner Occupied HU | 39 (81.2%) |
| Renter Occupied HU | 8 (16.7%) |
| Vacant Housing Units | 1 ( 2.1%) |
| Median Home Value | $425,000 |
| Average Home Value | $578,526 |
| Housing Affordability Index3 | 0 |
HOUSEHOLDS | |
| Total Households | 47 |
| Average Household Size | 2.40 |
| Family Households | 40 |
| Average Family Size | 3.00 |
GROWTH RATE / YEAR |
2020-2025 | 2025-2030 |
|---|---|---|
| Population | 0.87% | 0.70% |
| Households | 1.26% | 0.84% |
| Families | 0.98% | |
| Median Household Income | -7.97% | |
| Per Capita Income | 1.55% | |
| Owner Occupied HU | 4.24% |
The table below compares Saint Marys to the other 1,026 incorporated cities, towns and CDPs in Iowa by rank and percentile using July 1, 2025 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.
| Variable Description | Rank | Percentile |
|---|---|---|
| Total Population | # 833 | 19th |
| Population Density | # 390 | 62nd |
| Median Household Income | # 3 | 100th |
| Housing Affordability Index | # 22 | 2nd |
| Per Capita Income | # 62 | 94th |
| Diversity Index | # 341 | 67th |
Additional comparisons and rankings can be made with a VERY EASY TO USE Iowa Census Data Comparison Tool.
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