Explore St. Mary, Missouri, with this interactive street and satellite map.
| City | St. Mary |
| State | Missouri (MO) |
| County | Ste. Genevieve County |
| Country | United States of America |
| Timezone | Central Time (America/Chicago) |
| Latitude | 37.878942 |
| Longitude | -89.949277 |
| Population | 309 |
| Density | 199.2 /km² |
| Incorporated | Yes |
| ZIP Code | 63673 |
| Area Code | 816 |
| County Seat | Ste. Genevieve |
| School District | Ste. Genevieve County R-II School District |
St. Mary unfolds along the banks where the Old River carves a deliberate, silt-heavy path through the Missouri landscape. It lies 26.7 miles east-northeast of Farmington, MO (from Farmington, MO: bearing 75°T), and is situated 7.3 miles west-southwest of Chester. The terrain surrounding St. Mary defines itself by the low, alluvial plains that stretch toward the horizon, punctuated by the distant, hazy silhouette of Lick Hill rising four miles to the west. Here, the air carries a heavy, fertile dampness, and the light at dusk takes on a bruised, amber quality that seems to cling to the tall grasses and the dense, unruly thickets of the Middle Mississippi River National Wildlife Refuge. This refuge acts as a silent guardian of the local ecosystem, preserving a wilder, untamed version of the floodplain that contrasts sharply with the nearby fields.
St. Mary holds a quiet persistence in its history, reflecting the pragmatic character of an inland settlement shaped by the flow of the Old River. The local economy remains tethered to the rhythm of the soil and the legacy of agricultural industry, where the pace of labor is dictated by the seasonal shift rather than the frantic ticking of a clock. Beyond the immediate fields, the landscape occasionally dips into the rugged, shadowed terrain of Opossum Hollow, providing a stark topographical counterpoint to the flat expanse of the river valley. While the more dramatic waters of Johnson Shut-Ins lie many miles to the south and the quiet surface of Saint Marys Lake rests eleven miles distant, St. Mary finds its own distinct identity in the steady, patient movement of the water past its doorstep.
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This page provides an embedded street and satellite map of St. Mary, Missouri. Coordinates: 37.878942, -89.949277. Live weather conditions are sourced directly from the National Weather Service. Real-time local and world news feeds keep the page current.
Detailed location data for St. Mary includes the ZIP code (63673), telephone area code (816), county seat of Ste. Genevieve County (Ste. Genevieve), and school district assignment (Ste. Genevieve County R-II School District).
Location data is drawn from the USGS Geographic Names Information System (GNIS) and cross-verified against 2020 US Census records by coordinate proximity. Population figures are sourced from the 2020 US Census.
| Page generated | August 2026 |
| Location data | SimpleMaps US Cities Database; coordinates matched to USGS GNIS definitive data |
| Wikipedia validation | Article content matched to USGS GNIS coordinates via Wikipedia geosearch API. |