There are 35 US Post Offices in Burlington County serving a total of 502,234 residents equating to 14,350 residents per post office. It's estimated that approximately 801,622 packages are handled across the 35 county post offices annually. Burlington County is a county located in the U.S. state of New Jersey. The county is the largest in New Jersey by area, and its county seat is Mount Holly Township. Burlington County had a Census-estimated population of 450,226 in 2015, representing a 0.3% increase from the 2010 United States Census, when the population was enumerated at 448,734, in turn an increase of 25,340 (6.0%) from the 423,394 enumerated in the 2000 Census, retaining its position as the 11th-most populous county in the state. The most-populous place was Evesham Township, with 45,538 residents at the time of the 2010 Census, while Washington Township covered 102.71 square miles (266.0 km2), the largest total area of any municipality in Burlington county. The Bureau of Economic Analysis ranked the county as having the 158th-highest per capita income of all 3,113 counties in the United States (and the 11th-highest in New Jersey) as of 2009. Burlington County is part of the Delaware Valley area, located east of the Delaware River. However, the county stretches across the state, and its southeast corner reaches tidal estuaries leading to southern New Jersey's Great Bay, which separates the county from the Atlantic Ocean."