Mercer County
County
The New Jersey State House and its golden dome at Trenton in 2006
Flag
Nickname:  The Capital County[1]
Location within the U.S. state of New Jersey
New Jersey's location within the U.S.
Coordinates: 40°17′N 74°42′W / 40.28°N 74.70°W / 40.28; -74.70
Country	United States
State	New Jersey
Founded	1838[2]
Named for	Hugh Mercer
Seat	Trenton[2]
Largest municipality	Hamilton Township (population) Hopewell Township (area)
Area [3]
• Total	228.86 sq mi (592.7 km2)
• Land	224.44 sq mi (581.3 km2)
• Water	4.42 sq mi (11.4 km2)  1.9%
Population  (2020)[4]
• Total	387,340
• Density	1,724.9/sq mi (666.0/km2)
Congressional districts	3rd, 12th
Website	www.mercercounty.org

Mercer County is a county in New Jersey, United States of America. Trenton, the capital of New Jersey, is in Mercer County. As of the year 2020, 387,340 people lived in the county.^[4] Mercer County was founded in the year 1838.^[2]

Places next to Mercer County, New Jersey
Hunterdon County Somerset County Bucks County, Pennsylvania Mercer County, New Jersey Middlesex County Burlington County Monmouth County

v t e New York metropolitan area
Counties	Bergen Bronx Carbon Dutchess Essex Fairfield Hudson Hunterdon Kings Lehigh Litchfield Mercer Middlesex Monmouth Monroe Morris Nassau New Haven Northampton New York Ocean Orange Passaic Pike Putnam Queens Richmond Rockland Somerset Suffolk Sussex Sullivan Ulster Union Warren Westchester
Major cities and towns	New York City The Bronx Brooklyn Manhattan Queens Staten Island Hempstead
Cities over 100,000	Allentown Bridgeport Edison Elizabeth Huntington Jersey City New Haven Newark Paterson Stamford Waterbury Woodbridge Yonkers
Cities and towns over 25,000	Bayonne Bergenfield Bethlehem Branford Cheshire Clifton Danbury East Haven East Orange Easton Englewood Ewing Township Fairfield Fair Lawn Fort Lee Freehold Township Garfield Greenwich Hackensack Hamden Hamilton Township, Mercer County Hoboken Howell Kearny Long Beach Long Branch Lower Macungie Township Mahwah Manalapan Marlboro Meriden Middletown, NJ Middletown, NY Milford Mount Vernon Naugatuck New Brunswick New Milford New Rochelle Newburgh Newtown Norwalk Old Bridge Paramus Passaic Perth Amboy Plainfield Poughkeepsie Rahway Shelton Stratford Teaneck Torrington Trenton Trumbull Union City Wallingford West Haven Westfield Westport White Plains Whitehall Township, PA
Cities and towns over 10,000	Ansonia Asbury Park Beacon Bethel Bethlehem Township, PA Brookfield Coolbaugh Township Darien Derby Dover Dumont East Stroudsburg Edgewater Elmwood Park Emmaus, PA Fairview Franklin Lakes Freehold Borough Glen Rock Guildford Guttenberg Harrison, NJ Harrison, NY Hasbrouck Heights Hazlet Hillsdale Holmdel Kingston Linden Little Ferry Lodi Lyndhurst Madison Monroe Morristown New Canaan New Fairfield New Milford North Arlington North Branford North Haven Northampton, PA Oakland Orange Palisades Park Phillipsburg Plymouth Peekskill Ramsey Red Bank Ridgefield, CT Ridgefield, NJ Ridgefield Park Ridgewood Rutherford Rye Saddle Brook Scarsdale Secaucus Seymour Somerville Southbury Stroud Township Summit Tenafly Upper Macungie Township Wallington Watertown, CT West Milford West New York Weston Westwood Wilton Winchester Wolcott Wyckoff
Regions	Catskills Central Jersey Greater Danbury Greater New Haven Greater Waterbury Hudson Valley Lehigh Valley Litchfield Hills Long Island North Jersey Poconos Skylands Region Southwestern Connecticut

v t e Municipalities and communities of Mercer County, New Jersey, United States
County seat: Trenton
City	Trenton
Boroughs	Hightstown Hopewell Pennington Princeton
Townships	East Windsor Ewing Hamilton Hopewell Lawrence Robbinsville West Windsor
CDPs	Groveville Hamilton Square Lawrenceville Mercerville Princeton Junction Robbinsville The College of New Jersey Titusville Twin Rivers Washington Crossing White Horse Yardville
Other communities	Ackors Corner Allens Station Battle Monument Bear Tavern Berkeley Square Berrien City Braeburn Heights Cadwalader Heights Carsons Mills Cedar Grove Centerville Chambersburg Chewalla Park Clarksville Coalport/North Clinton Coxs Corner Downtown Trenton Duck Island Dutch Neck East Trenton East Trenton Heights Edinburg Eldridge Park Etra Ewing Ewing Park Ewing/Carroll Ewingville Extonville Fernwood Fisher/Richey/Perdicaris Glendale Glenmoore Greenwood/Hamilton Grover's Mill Hanover/Academy Harbourton Harneys Corner Heath Manor Hickory Corner Hillcrest Hillside Terrace Hillwood Lakes Hiltonia Hopewell Valley Hutchinson Mills Lamberton Lawrence Station Lewisville Locust Corner Marshalls Corner Mill Hill Millstone Mount Rose New Canton New Sharon North Crosswicks North Trenton Nottingham Pages Corners Penns Neck Pleasant Valley Port Mercer Post Corner Princessville Princeton Estates Princeton Ivy East Princeton North Prospect Heights Prospect Park Quaker Bridge Rosedale Scudders Falls Shabakunk Hills Slackwood South Trenton Stoutsburg The Island Top Road West Trenton Wilbur Wilburtha Windsor Yardville Heights

Authority control
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National	Germany Israel United States
Geographic	MusicBrainz area
Other	NARA

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