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New Jersey County Formation

County

Formed

History

County Seat

Atlantic County

1837

Created from part of Gloucester County

Mays Landing

     

(in Hamilton Township)

       

Bergen County

1675

One of four original counties created in

Hackensack

   

East Jersey

 
       

Burlington County

1681

One of two original counties created in

Mount Holly

   

West Jersey

 
       

Camden County

1844

Formed from part of Gloucester County

Camden

       

Cape May County

1685

Created by West Jersey from part of

Cape May Court House

   

Burlington County

(in Middle Township)

       

Cumberland County

1748

Established from part of Salem County

Bridgeton

       

Essex County

1675

One of four original counties created in

Newark

   

East Jersey

 
       

Gloucester County

1686

Formed by West Jersey from part of

Woodbury

   

Burlington County

 
       
       

Hudson County

1840

Created from part of Bergen County

Jersey City

       

Hunterdon County

1714

Formed from part of Burlington County

Flemington

       

Mercer County

1838

Formed from parts of Burlington County,

Trenton

   

Hunterdon County, Middlesex County, and

 
   

Somerset County

 
       

Middlesex County

1675

One of four original counties created in

New Brunswick

   

East Jersey

 
       

Monmouth County

1675

One of four original counties created in

Freehold Borough

   

East Jersey

 
       

Morris County

1739

Created from part of Hunterdon County

Morristown

       

Ocean County

1850

Established from part of Monmouth County

Toms River

     

(in Dover Township)

       

Passaic County

1837

Created from parts of Bergen County and

Paterson

   

Essex County

 
       

Salem County

1681

One of two original counties created in

Salem

   

West Jersey

 
       

Somerset County

1688

Formed from part of Middlesex County

Somerville

       

Sussex County

1753

Created from part of Morris County

Newton

       

Union County

1857

Established from part of Essex County

Elizabeth

       

Warren County

1824

Formed from part of Sussex County

Belvidere

       

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©2006 Kim Torp
Genealogy Trails