Mercer County is a county located in the U.S. state of New
Jersey. Its county seat is Trenton, the state capital. It is
officially part of both the New York metropolitan area and the
Trenton-Ewing Metropolitan Statistical Area. Unofficially, it is
considered part of the Delaware Valley (Philadelphia)
Metropolitan Area. The county is named for Continental Army
General Hugh Mercer, who died as a result of wounds received at
the Battle of Princeton on January 3, 1777. The Mercer Oak,
against which the dying general rested as his men continued to
fight, appears on the county seal. As of the 2010 United States
Census, the population was 366,513, an increase of 15,752 (4.5%)
from the 350,761 enumerated in the 2000 Census, making it the
12th-most populous county in the state. Mercer County ranks 80th
among the highest-income counties in the United States. The
Bureau of Economic Analysis ranked the county as having the
78th-highest per capita income of all 3,113 counties in the
United States (and the sixth-highest in