St. Mary (Ste. Marie, with French spelling) is a city in Ste. Genevieve County, Missouri, United States. The population was 360 at the 2010 census.
The small city was established by settlers of French descent, who also built St. Mary's Catholic Church. The city was originally named St. Mary's Landing.
St. Mary is located at 37°52′34″N 89°56′56″W (37.876153, -89.948811). St. Mary lies in the Grand Champ Bottoms. The community is bordered by Saint Laurent Creek to the south and Saline Creek to the north, with an offshoot of the Mississippi separating it from Kaskaskia Island to the east. According to the United States Census Bureau, the city has a total area of 0.61 square miles (1.58 km²), of which, 0.60 square miles (1.55 km²) is land and 0.01 square miles (0.03 km²) is water.
As of the census of 2010, there were 360 people, 159 households, and 89 families residing in the city. The population density was 600.0 inhabitants per square mile (231.7/km²). There were 188 housing units at an average density of 313.3 per square mile (121.0/km²). The racial makeup of the city was 91.67% White, 4.72% Black or African American, 0.28% Native American, 0.83% from other races, and 2.50% from two or more races. Hispanic or Latino of any race were 1.94% of the population.
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