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St. Mary, MO
City in Ste. Genevieve County, Missouri.
Population
285
Land area
0.6sq mi
People per sq mi
476
ZIP codes
0
St. Mary and its ZIP codes
St. Mary at a glance
- St. Mary is about 5.3 times as dense as Missouri as a whole.
Economy and federal money
Jobs, pay, income and spending are for Ste. Genevieve County. PPP loans are for St. Mary.
Unemployment rate
2.9%
Aug 2026, -0.6 pts in a year
Average annual pay
$60,799
6,167 jobs, 2025
Income per person
$54,731
BEA, 2024
Federal spending
$130M
FY 2026, $7,050 per person
Environment and hazard risk
St. Mary, MO, from FEMA, NOAA and EPA
Natural hazard risk
Relatively Low
Top: heat wave
Storm events since 1996
288
Countywide, mostly thunderstorm wind
Flood insurance policies
43
0.4% of homes, county
July high / Jan low
89° / 24°F
42.8 inches of rain a year
Health statistics
Share of adults in St. Mary, MO, CDC PLACES estimates
Obesity
37.6%
U.S. 33.3% +4.3 pts
Diabetes
12.9%
U.S. 12.1% +0.8 pts
Smoking
18.0%
U.S. 12.8% +5.2 pts
Uninsured (18-64)
8.9%
U.S. 11.1% -2.2 pts
Cities near St. Mary
| Name | Distance | Land area (sq mi) |
|---|---|---|
| Kaskaskia, ILVillage | 3.6 mi | 0.1 |
| LithiumCensus-designated place | 4.4 mi | 0.8 |
| OzoraCensus-designated place | 5.6 mi | 6.1 |
| BrewerCensus-designated place | 6.2 mi | 2.3 |
| Chester, ILCity | 6.5 mi | 5.8 |
| Ste. GenevieveCity | 9.2 mi | 3.9 |
| Ellis Grove, ILVillage | 9.8 mi | 0.5 |
| PerryvilleCity | 11 mi | 8.2 |
| ShakertowneCensus-designated place | 13 mi | 1.3 |
| Rockwood, ILVillage | 14 mi | 0.2 |
| WeingartenCensus-designated place | 15 mi | 1.1 |
| Evansville, ILVillage | 15 mi | 0.8 |
| GrayhawkCensus-designated place | 17 mi | 4.4 |
| Prairie du Rocher, ILVillage | 17 mi | 0.6 |
| LongtownTown | 17 mi | 0.1 |
| BloomsdaleCity | 18 mi | 1.6 |
Frequently asked questions
- What county is St. Mary, MO in?
- St. Mary is in Ste. Genevieve County, Missouri.
- What is the population of St. Mary, MO?
- About 285 people live in St. Mary, based on American Community Survey 5-year estimates.
- What cities are near St. Mary?
- Nearby places include Kaskaskia, IL (3.6 mi), Lithium (4.4 mi), Ozora (5.6 mi), Brewer (6.2 mi), Chester, IL (6.5 mi).
Source: U.S. Census Bureau (TIGER/Line boundaries, American Community Survey) · Data as of 12/31/2023