St. Marys is a somewhat small city located in the state of Ohio. With a population of 8,376 people and three associated neighborhoods, St. Marys is the 198th largest community in Ohio. Much of the housing stock in St. Marys was built prior to World War II, making it one of the older and more historic cities in the country.

One of the benefits of St. Marys is that there is very little traffic. The average commute to work is 17.73 minutes, which is substantially less than the national average. Not only does this mean that the drive to work is less aggravating, but noise and pollution levels are lower as a result.

St. Marys is a small city, and as such doesn't have a public transit system that people use to get to and from their jobs every day.

The education level of St. Marys citizens, measured as those with bachelor's degrees or advanced degrees, is similar to the national average for all American cities and towns. 17.50% of adults 25 and older in St. Marys have a college degree.

The per capita income in St. Marys in 2022 was $35,322, which is middle income relative to Ohio and the nation. This equates to an annual income of $141,288 for a family of four. However, St. Marys contains both very wealthy and poor people as well.

The people who call St. Marys home describe themselves as belonging to a variety of racial and ethnic groups. The greatest number of St. Marys residents report their race to be White, followed by Black or African-American. Important ancestries of people in St. Marys include German, Irish, English, French, and Scottish.

The most common language spoken in St. Marys is English. Other important languages spoken here include Italian and German/Yiddish.