St. Petersburg is a borough in Clarion County, Pennsylvania, United States. The population was 405 at the 2000 census. St. Petersburg is located at 41°09′39″N 79°39′14″W / 41.160944°N 79.653937°W / 41.160944; -79.653937. According to the United States Census Bureau, the borough has a total area of 0.3 square miles , all of it land. As of the census of 2000, there were 405 people, 164 households, and 115 families residing in the borough. The population density was 1,189.8 people per square mile . There were 168 housing units... at an average density of 493.6 per square mile . The racial makeup of the borough was 99.26% White, 0.25% from other races, and 0.49% from two or more races. Hispanic or Latino of any race were 0.49% of the population. There were 164 households out of which 31.7% had children under the age of 18 living with them, 55.5% were married couples living together, 10.4% had a female householder with no husband present, and 29.3% were non-families. 27.4% of all households were made up of individuals and 11.6% had someone living alone who was 65 years of age or older. The average household size was 2.
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| County: | Clarion County |
| State: | Pennsylvania |
| Population: | 386 |
| Area: | 0.3 sq. mi. |
| Time zone: | North American Eastern Time Zone |
| Also known as: | St. Petersburg, Pennsylvania, Saint Petersburg, Saint Petersburg, Pennsylvania |