St. Louis is a city in Gratiot County in the U.S. state of Michigan. As of the 2010 census the population was 7,482.
According to the United States Census Bureau, the city has a total area of 3.53 square miles (9.14 km), of which 3.34 square miles (8.65 km) is land and 0.19 square miles (0.49 km) is water.
It was long recognized that St. Louis sits at the geographic center of Michigan’s lower peninsula “as closely as can be determined.” A campaign by Clarence and Odessa Smazel in the early 1950s, owners of the St. Louis Leader-Press, a now-defunct local newspaper, resulted in the State of Michigan designating it as such: a sign in Clapp Park on Highway M-46 denotes the city as the official “Middle of the Mitten.”
As of the census of 2010, there were 7,482 people, 1,491 households, and 937 families residing in the city. (This includes an institutionalized population of 3,823, mostly in Pine River Correctional Facility.) The population density was 2,240.1 inhabitants per square mile (864.9/km). There were 1,638 housing units at an average density of 490.4 per square mile (189.3/km). The racial makeup of the city was 67.7% White, 29.1% African American, 0.6% Native American, 0.2% Asian, 1.3% from other races, and 1.0% from two or more races. Hispanic or Latino of any race were 5.7% of the population.
There were 1,491 households of which 34.6% had children under the age of 18 living with them, 41.2% were married couples living together, 16.8% had a female householder with no husband present, 4.8% had a male householder with no wife present, and 37.2% were non-families. 31.6% of all households were made up of individuals and 13.7% had someone living alone who was 65 years of age or older. The average household size was 2.45 and the average family size was 3.04.
The median age in the city was 36.1 years. 13.5% of residents were under the age of 18; 12.4% were between the ages of 18 and 24; 41.3% were from 25 to 44; 24.1% were from 45 to 64; and 8.9% were 65 years of age or older. The gender makeup of the city was 72.7% male and 27.3% female.
As of the census of 2000, there were 4,494 people, 1,468 households, and 964 families residing in the city. The population density was 1,568.4 per square mile (604.6/km²). There were 1,575 housing units at an average density of 549.7 per square mile (211.9/km²). The racial makeup of the city was 83.00% White, 10.08% African American, 1.02% Native American, 0.31% Asian, 2.74% from other races, and 2.85% from two or more races. Hispanic or Latino of any race were 7.50% of the population.
There were 1,468 households out of which 31.5% had children under the age of 18 living with them, 47.6% were married couples living together, 13.4% had a female householder with no husband present, and 34.3% were non-families. 29.5% of all households were made up of individuals and 12.6% had someone living alone who was 65 years of age or older. The average household size was 2.39 and the average family size was 2.92.
In the city, the population was spread out with 20.6% under the age of 18, 12.1% from 18 to 24, 35.0% from 25 to 44, 20.9% from 45 to 64, and 11.4% who were 65 years of age or older. The median age was 35 years. For every 100 females, there were 142.5 males. For every 100 females age 18 and over, there were 155.6 males.
The median income for a household in the city was $31,122, and the median income for a family was $39,271. Males had a median income of $29,028 versus $19,272 for females. The per capita income for the city was $14,196. About 10.1% of families and 15.9% of the population were below the poverty line, including 19.9% of those under age 18 and 10.7% of those age 65 or over.