History and Facts of New Jersey Counties
List of New Jersey Counties
New Jersey is divided into 21 counties.
|County||Created||Created From||Named For||County Seat||Notes|
|Atlantic County||07 Feb 1837||Gloucester County||Atlantic Ocean, which forms the county's eastern border||Mays Landing|
|Bergen County||01 Mar 1683||One of four original counties created in East Jersey||Bergen, New Netherland settlement||Hackensack|
|Burlington County||17 May 1694||One of two original counties created in West Jersey||The old ancient name for an inland market near Bridlington, England||Mount Holly Township|
|Camden County||13 Mar 1844||Gloucester County||Charles Pratt, 1st Earl Camden (1714–1794), an English supporter of the colonists during the American Revolution||Camden|
|Cape May County||12 Nov 1692||Burlington County||The 17th-century Dutch explorer Cornelius Jacobsen Mey, who explored and surveyed the Delaware Bay to the south of the county||Cape May Court House|
|Cumberland County||24 May 2019||Salem County||Prince William, Duke of Cumberland (1721–1765), second son of George II of England and military victor at the Battle of Culloden in 1746||Bridgeton|
|Essex County||01 Mar 1683||One of four original counties created in East Jersey||The county of Essex in England||Newark|
|Gloucester County||28 May 1686||Burlington County||The city of Gloucester, England||Woodbury|
|Hudson County||22 Feb 1840||Bergen County||The English explorer Henry Hudson (d. 1611), who explored portions of New Jersey's coastline||Jersey City|
|Hunterdon County||24 May 2019||Burlington County||Robert Hunter (1664–1734), the Colonial Governor of New Jersey from 1710 to 1720||Flemington|
|Mercer County||22 Feb 1838||Burlington, Hunterdon, Middlesex, and Somerset Counties||In honor of Hugh Mercer (1726–1777); a Scottish soldier and physician; a brigadier general in the Continental Army during the American Revolutionary War. He died at the Battle of Princeton.||Trenton|
|Middlesex County||01 Mar 1683||One of four original counties created in East Jersey||The historic county of Middlesex in England||New Brunswick|
|Monmouth County||01 Mar 1683||One of four original counties created in East Jersey||The historic county of Monmouthshire in Wales||Freehold Borough|
|Morris County||15 Mar 1739||Hunterdon County||Colonel Lewis Morris (1671–1746), colonial governor of New Jersey at the time of the county's formation||Morristown|
|Ocean County||15 Feb 1850||Monmouth County||The Atlantic Ocean, which forms the eastern border of New Jersey||Toms River|
|Passaic County||07 Feb 1837||Bergen County and Essex County||"Pasaeck", a Lenape word meaning "valley"||Paterson|
|Salem County||17 May 1694||One of two original counties created in West Jersey||A Hebrew word meaning "peace"||Salem|
|Somerset County||14 May 1688||Middlesex County||The county of Somerset in England||Somerville|
|Sussex County||16 May 1753||Morris County||The county of Sussex in England||Newton|
|Union County||19 Mar 1857||Essex County||The union of the United States, which was being threatened by the dispute over slavery||Elizabeth|
|Warren County||20 Nov 1824||Sussex County||In honor of Joseph Warren (1741–1775); physician and a major general in the Continental Army during the American Revolutionary War. He was killed at the Battle of Bunker Hill||Belvidere|
List of Old Former / Extinct New Jersey Counties
New Jersey has no counties that are Extinct.
Map of New Jersey County Boundary Changes from 1683 to 1928
This Interactive Map of New Jersey Counties show the historical boundaries, names, organization, and attachments of every county, extinct county and unsuccessful county proposal from the creation of New Jersey from 1683-1928.
Fun Facts about New Jersey Counties
Counties by Year
- In 1683 the four original New Jersey counties were formed, Bergen, Essex, Middlesex and Monmouth Counties.
- The last county to be formed was Union County in 1857.
Facts for County Size
- Burlington County (805 sq mi) is the largest county in New Jersey.
- Hudson County (47 sq mi) is the smallest county in New Jersey.
Facts for County Population (2017 Est.)
- Bergen County (905,116) is the most populated county in New Jersey.
- Salem County (66,083) is the least populated county in New Jersey.
Facts for New Jersey Counties and Cities
New Jersey’s 10 largest cities (2019) are:
- Newark (282,803) is in Essex County
- Jersey City (265,932) is in Hudson County
- Paterson (147,890) is in Passaic County
- Elizabeth (129,363) is in Union County
- Toms River (88,707) is in Ocean County
- Clifton (82,776) is in Passaic County
- Trenton (84,867) is in Mercer County
- Camden (75,550) is in Camden County
- Passaic (68,982) is in Passaic County
- Union City (69,815) is in Hudson County