St. Bernard is located at , and along with Norwood and Elmwood Place, is an enclave surrounded by the city ofCincinnati. According to the United States Census Bureau, the village has a total area of, of which is land and is water. While the village may be small it does have its own areas and neighborhoods: Ivorydale is the area where Procter & Gamble's glycerin and surfactant plant and the St. Bernard Soap Company are located. Other neighborhoods are Ludlow Grove, Woodside Heights, Kemper Estates, Nurre Estates, and Chalet.
As of the census of 2010, there were 4,368 people, 1,869 households, and 1,090 families living in the village. The population density was. There were 2,128 housing units at an average density of. The racial makeup of the village was 80.0% White, 15.7% African American, 0.3% Native American, 0.7% Asian, 0.1% Pacific Islander, 0.9% from other races, and 2.3% from two or more races. Hispanic or Latino of any race were 1.9% of the population. There were 1,869 households of which 29.9% had children under the age of 18 living with them, 37.2% were married couples living together, 15.4% had a female householder with no husband present, 5.7% had a male householder with no wife present, and 41.7% were non-families. 36.2% of all households were made up of individuals and 12.8% had someone living alone who was 65 years of age or older. The average household size was 2.33 and the average family size was 3.08. The median age in the village was 38.2 years. 23.6% of residents were under the age of 18; 10% were between the ages of 18 and 24; 25.1% were from 25 to 44; 28.2% were from 45 to 64; and 13% were 65 years of age or older. The gender makeup of the village was 47.2% male and 52.8% female.
2000 census
As of the census of 2000, there were 4,924 people, 2,069 households, and 1,251 families living in the village. The population density was 3,196.1 people per square mile. There were 2,195 housing units at an average density of 1,424.7/sq mi. The racial makeup of the village was 91.41% White, 6.46% African American, 0.18% Native American, 0.63% Asian, 0.02% Pacific Islander, 0.43% from other races, and 0.87% from two or more races. Hispanic or Latino of any race were 0.65% of the population. There were 2,069 households out of which 29.5% had children under the age of 18 living with them, 41.0% were married couples living together, 14.4% had a female householder with no husband present, and 39.5% were non-families. 34.5% of all households were made up of individuals and 14.5% had someone living alone who was 65 years of age or older. The average household size was 2.38 and the average family size was 3.09. In the village, the population was spread out with 25.4% under the age of 18, 9.5% from 18 to 24, 29.3% from 25 to 44, 20.3% from 45 to 64, and 15.5% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 90.9 males. For every 100 females age 18 and over, there were 84.2 males. The median income for a household in the village was $37,356, and the median income for a family was $45,366. Males had a median income of $35,095 versus $26,672 for females. The per capita income for the village was $18,036. About 7.3% of families and 8.7% of the population were below the poverty line, including 7.6% of those under age 18 and 11.8% of those age 65 or over.
Culture
The village operated the Dial-A-Ride bus program until February 2018, when the service was discontinued. The town is home to several clubs and organizations, such as the Women's Club, the R & L Club, the Eagles Club, Friars Club, and the oldest club in the area, the Idle Hour Social Club, founded in 1913. The Idle Hour Social Club prides itself as the oldest state-chartered non-profit organization in the State of Ohio. It is also home of three churches; Wilson Presbyterian, Emmanuel Church of God and St. Clement Catholic Church.