St. Petersburg is a city in Pinellas County, Florida, United States. As of the 2015 census estimate, the population was 257,083, making it the fifth-most populous city in Florida and the largest in the state that is not a county seat (the city of Clearwater is the seat of Pinellas County).

With an average of some 361 days of sunshine each year, and a Guinness World Record for logging the most consecutive days of sunshine (768 days), it is nicknamed "The Sunshine City". Due to its good weather and low cost of living, the city has long been a popular retirement destination, although in recent years the population has moved in a much more youthful direction. American Style magazine ranked St. Petersburg its top mid-size city in 2011, citing its "vibrant" arts scene.