| COUNTY |
DATE
FORMED |
COUNTY
SEAT |
HISTORICAL
DATA |
| Atlantic |
1837 |
Mays
Landing |
Formed
from Gloucester County. |
| Bergen |
1683 |
Hackensack |
Original
county in East Jersey; Passaic County set off, 1837;
Hudson County set off, 1840. |
| Burlington |
1681 |
Mount
Holly |
Original
county in West Jersey--court established 1681; boundary
set with Gloucester County, 1692; Hunterdon County set
off, 1714; part of Mercer County formed from Burlington,
1838. |
| Camden |
1844 |
Camden |
Formed
from Gloucester County. |
| Cape
May |
1685 |
Cape
May Court House |
Original
county in West Jersey--court established 1685; boundaries
set 1692 |
| Cumberland |
1748 |
Bridgeton |
Formed
from Salem County. |
| Essex |
1683 |
Newark |
Original
county in East Jersey; part of Passaic County formed
from Essex, 1837; Union County set off, 1857. |
| Gloucester |
1686 |
Woodbury |
Original
county in West Jersey--court established 1686; boundary
set with Burlington County, 1692; Atlantic County set
off, 1837; Camden County set off, 1844. |
| Hudson |
1840 |
Jersey
City |
Formed
from Bergen County. |
| Hunterdon |
1714 |
Flemington |
Formed
from Burlington County; Morris County set off, 1739;
part of Mercer County formed from Hunterdon, 1838. |
| Mercer |
1838 |
Trenton |
Formed
from Burlington, Hunterdon, Middlesex and Somerset Counties. |
| Middlesex |
1683 |
New
Brunswick |
Original
county in East Jersey; Somerset County set off, 1688;
part of Mercer County formed from Middlesex, 1838. |
| Monmouth |
1683 |
Freehold |
Original
county in East Jersey; Ocean County set off, 1850. |
| Morris |
1739 |
Morristown |
Formed
from Hunterdon County; Sussex County set off, 1753.
|
| Ocean |
1850 |
Toms
River |
Formed
from Monmouth County. |
| Passaic |
1837 |
Paterson |
Formed
from Bergen and Essex Counties. |
| Salem |
1681 |
Salem |
Original
county in West Jersey--court established 1681; formed
from Salem Tenth, 1694; Cumberland set off, 1748. |
| Somerset |
1688 |
Somerville |
Formed
from Middlesex County. |
| Sussex |
1753 |
Newton |
Formed
from Morris County; Warren County set off, 1824. |
| Union |
1857 |
Elizabeth |
Formed
from Essex County. |
| Warren |
1824 |
Belvidere |
Formed
from Sussex County. |
