St. Petersburg is a city in Pinellas County, Florida, United States. As of the 2014 census estimate, the population was 253,693, making St. Petersburg the fifth most populous city in the state of Florida and the largest city in Florida that is not a county seat (the city of Clearwater is the county seat).
The city was co-founded by John C. Williams, formerly of Detroit, who purchased the land in 1875, and by Peter Demens who was instrumental in bringing the terminus of a railroad there in 1888. The first major newspaper to debut in Tampa Bay was the St. Petersburg Times which established in 1884. St. Petersburg was incorporated as a town on February 29, 1892, when it had a population of only some 300 people.