St. Marys is a somewhat small city located in the state of Ohio. With a population of 8,404 people and three associated neighborhoods, St. Marys is the 198th largest community in Ohio. St. Marys has a large stock of pre-World War II architecture, 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 18.01 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.

In terms of college education, the citizens of St. Marys rank slightly lower than the national average. 13.99% of adults 25 and older in St. Marys have a bachelor's degree or advanced degree, while 21.84% of adults have a 4-year degree or higher in the average American community.

The per capita income in St. Marys in 2022 was $32,568, which is middle income relative to Ohio and the nation. This equates to an annual income of $130,272 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 Asian. 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.