St. Marys is a city in Auglaize County, Ohio, United States. The population was 8,332 at the 2010 census. It is included in the Wapakoneta, Ohio, Micropolitan Statistical Area.
Formerly known as "Fort Barbee" and "Girty's Town", St. Marys was the county seat of Mercer County from 1824 until 1840 when the seat was moved to Celina. After Auglaize County was organized in 1848, St. Marys competed with Wapakoneta for the position as county seat but was ultimately unsuccessful in a controversial countywide election.
Three properties in St. Marys are listed on the National Register of Historic Places: the former Fountain Hotel, the Dr. Issac Elmer Williams House and Office, and the former Holy Rosary Catholic Church, which was destroyed one year before it was placed on the Register.
According to the United States Census Bureau, the city has a total area of 4.62 square miles (11.97 km²), of which 4.59 square miles (11.89 km²) is land and 0.03 square miles (0.08 km²) is water.
As of the census of 2010, there were 8,332 people, 3,283 households, and 2,194 families residing in the city. The population density was 1,815.3 inhabitants per square mile (700.9/km²). There were 3,620 housing units at an average density of 788.7 per square mile (304.5/km²). The racial makeup of the city was 96.7% White, 0.4% African American, 0.1% Native American, 0.7% Asian, 0.1% Pacific Islander, 0.4% from other races, and 1.5% from two or more races. Hispanic or Latino of any race were 1.3% of the population.
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