City in Missouri
St. Mary, MO
- Population
- 306 (2024)
- Density
- 511 / sq mi
- Land area
- 0.6 sq mi
- Water area
- 0.0 sq mi
- Coordinates
- 37.8738, -89.9497
Resident reviews
Be the first to review →No reviews yet. Live in St. Mary, or used to? Tell people what it is really like.
ZIP codes
Select a ZIP code for neighborhood-level income, rent and home values.