Mercer County is a county located in the U.S. state of New Jersey. Its county seat is Trenton. It is part of the New York Metropolitan Area. Mercer County is also its own Metropolitan Statistical Area, which is formally named the Trenton-Ewing MSA. As New Jersey’s capital county, Mercer County is a center for commerce and culture in the Garden State.

According to the U.S. Census Bureau, the county has a total area of 229 square miles, of which, 226 square miles of it is land and 3 square miles of it is water. The total area is 1.27% water.

The county is generally flat and low-lying on the inner coastal plain with a few hills closer to the Delaware River. Baldpate Mountain near Pennington, is the highest hill, at 480 feet (146.3 m) above sea level. The lowest point is at sea level along the Delaware.

The county is named for Continental Army General Hugh Mercer, who died at the Battle of Princeton in 1777. As of the United States 2000 Census, the population was 350,761, estimated to have risen to 367,605 as of 2006. Mercer County ranks 79th among the highest-income counties in the United States.

The transportation infrastructure in Mercer County is also excellent. Key corridors along the New Jersey Turnpike in Mercer County are considered the most lucrative commerce centers in the state. In addition, Interstates 95, 195 and 295, as well as state highways routes 1, 29, 31 and 130 make Mercer County more attractive. Mercer County also offers access to commuter rail services, a light rail system and the Trenton-Mercer Airport.

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 The 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 Mill.

Mercer County is home to Princeton University, Rider University, The College of New Jersey, Thomas Edison State College and Mercer County Community College. The county holds some of the states greatest cultural and historic sites with Revolutionary War battle sites in Trenton and Princeton.

Recreation and entertainment are abundant with first-class parks, four public golf courses, the Trenton Titans professional hockey team and the New York Yankees AA-affiliate, Trenton Thunder at Waterfront Park. Sovereign Bank Arena is ranked among the best performing venues of its size in the world.

With a strong economic base and a record of job creation, Forbes recently ranked Mercer County as 21st on the list for businesses to locate.

Mercer County’s excellent schools, tourist destinations, and diverse, well educated workforce make our county a great place to live, work and play.

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