Palm Beach County is the largest county in Florida. It is one of three counties that makes up the Miami metropolitan area. In 2007 the number of people in Palm Beach County was 1,351,236. The area of Palm Beach County is 2,386 square miles. Palm Beach County was made in 1909. The three largest cities in Palm Beach County are West Palm Beach (first, 150,000 people), the county seat, Boca Raton (second, almost 90,000 people), and Boynton Beach (third, almost 70,000 people). The county owns the southeastern area of Lake Okeechobee.