Mercer County, New Jersey
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|County of Mercer|
The Capital County
Location within the U.S. state of New Jersey
New Jersey's location within the U.S.
|Named for||Continental Army General Hugh Mercer|
|Largest municipality||Hamilton Township (population)|
Hopewell Township (area)
|• Total||228.89 sq mi (592.8 km2)|
|• Land||224.56 sq mi (581.6 km2)|
|• Water||4.33 sq mi (11.2 km2) 1.89%%|
374,733 (2017 est.; 12th in state)
|• Density||1,623/sq mi (626.5/km2)|
|Congressional districts||4th, 12th|
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 2006, 367,605 people lived in the county. Mercer county was founded in the year 1838.