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.

Compared to the rest of the country, citizens of St. Marys spend much less time in their cars: on average, their commute to work is only 17.73 minutes. This also means that noise and pollution levels in the city are less than they would otherwise be.

As is often the case in a small city, St. Marys doesn't have a public transportation system that people use for their commute.

In terms of college education, St. Marys is nearly on par with the US average for all cities of 21.84%: 17.50% of adults 25 and older in St. Marys have a bachelor's degree or advanced 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.