There are 31 US Post Offices in Ocean County serving a total of 570,543 residents equating to 18,405 residents per post office. It's estimated that approximately 910,650 packages are handled across the 31 county post offices annually. Ocean County is a county located along the Jersey Shore in the U.S. state of New Jersey. Its county seat is Toms River, which, like the county itself, has been one of the fastest growing areas of the state since the 1990s. Ocean County had a Census-estimated population of 588,721 in 2015, a 2.1% increase from the 576,567 enumerated in the 2010 United States Census, having increased by 65,651 (+12.8%) from the 2000 Census population of 510,916, surpassing Union County to become the fifth-most populous county in the state and making Ocean County the fastest growing in the state of New Jersey in terms of increase in the number of residents and second-highest in percentage growth. Ocean County was established on February 15, 1850, from portions of Monmouth County, with the addition of Little Egg Harbor Township which was annexed from Burlington County on March 30, 1891. The most populous place was Lakewood Township, with 92,843 residents at the time of the 2010 Census (up 32,491 since 2000, the largest population increase of any municipality in the state), while Jackson Township, covered 100.62 square miles (260.6 km2), the largest total area of any municipality in the county. Ocean County is located 50 miles (80 km) east of Philadelphia, 70 miles (110 km) south of New York City, and 25 miles (40 km) north of Atlantic City, making it a prime destination for residents of these cities during the summer. As with the entire Jersey Shore, summer traffic routinely clogs local roadways throughout the season. Ocean County is part of the New York metropolitan area, and is home to many tourist attractions frequently visited by Delaware Valley residents, especially the beachfront communities of Seaside Heights, Long Beach Island, Point Pleasant Beach, as well as Six Flags Great Adventure, which is the home of the world's tallest and second-fastest roller coaster, Kingda Ka. Ocean County is also a gateway to New Jersey's Pine Barrens, one of the largest protected pieces of land on the East Coast."