Burlington County is located in the state of New Jersey. The county seat is in Mount Holly. The county seat had been in Burlington, but as population moved away from the Delaware River a more central location was needed. As of 2010, the population was 448,734. The largest city in the county is Evesham. Burlington County dates back to 1681, when its court was established in the Province of New Jersey. The county was formed on May 17, 1694, by the union of the first and second Tenths.This county is part of the Delaware Valley area.