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founded in 1838 and carved out of other surrounding counties, Mercer County has a historical impact that reaches
back to the pivotal battles of the American Revolutionary War. On the night of December 25, 1776, General George
Washington led the American forces across the Delaware River to attack Hessian forces in Trenton, New Jersey, who
did not anticipate an attack near Christmas. Washington followed up the assault with a surprise attack on General
Charles Cornwallis' forces in the Battle of Princeton on the eve of January 2, 1777, eventually retaking the colony.
The successful attacks built morale among the pro-independence colonists.
Mercer County also has the dubious distinction of being the famed landing spot for a Martian invasion of the United
States. In 1938, in what has become one of the most famous radio plays of all time, Orson Welles acted out his
War of the Worlds invasion. Wells landed his imaginary aliens on Mercer County soil, using what is now West Windsor
Township as the point of first contact. A monument commemorating the "landing" is erected at Grover's
|Recent Website Updates:
Community News: 29th Annual Commencement of Pennington Female Seminary
Administrators Notice: John Phillips
July 13, 1881 Hopewell Local News
September 2015: Obit: William Parret
Municipalities within County
East Windsor Township
West Windsor Township
The county seat is Trenton
Since 2000, Mercer County has been considered part of the New York metropolitan area; before
that time it had been considered part of the Philadelphia metropolitan area.
The county is named for Continental Army General Hugh Mercer, who died at the Battle of Princeton in 1777.
Somerset County, New Jersey - north
Middlesex County, New Jersey - northeast
Monmouth County, New Jersey - east
Burlington County, New Jersey - south
Bucks County, Pennsylvania - west
Hunterdon County, New Jersey - northwest
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