St. Petersburg in the United States is generally safe for solo female travelers with the necessary precautions. The city is famous for its vibrant arts scene, beautiful beaches, and a bustling downtown, and the locals are known to be friendly and helpful. However, like with any urban area, be aware of your surroundings, especially during the night and in less crowded areas. Stick to well-lit and populated areas when alone, and use common sense when interacting with strangers. Public transportation is reliable and safe, but always keep an eye on your belongings. As always, sharing your exact itinerary with someone trusted and keeping emergency numbers close at hand is crucial.