Middlesex County is bounded on the
north by Union County.
Incorporation Dates of New Jersey Counties
| County |
Formed |
Parent County |
County Seat |
| Atlantic |
1837 |
Gloucester |
Mays
Landing |
| Bergen |
1683 |
Province
of East Jersey |
Hackensack |
| Burlington |
1694 |
Province
of West Jersey |
Mount
Holly |
| Camden |
1844 |
Gloucester |
Camden |
| Cape
May |
1692 |
Province
of West Jersey |
Cape May
Court House |
| Cumberland |
1748 |
Salem |
Bridgeton |
| Essex |
1683 |
Province
of East Jersey |
Newark |
| Gloucester |
1686 |
Province
of West Jersey |
Woodbury |
| Hudson |
1840 |
Bergen |
Jersey
City |
| Hunterdon |
1714 |
Burlington |
Flemington |
| Mercer |
1838 |
Burlington,
Hunterdon,
Middlesex, Somerset |
Trenton |
| Middlesex |
1683 |
Province
of East Jersey |
New
Brunswick |
| Monmouth |
1683 |
Province
of East Jersey |
Freehold |
| Morris |
1739 |
Hunterdon |
Morristown |
| Ocean |
1850 |
Monmouth |
Toms River |
| Passaic |
1837 |
Bergen,
Essex |
Paterson |
| Salem |
1694 |
Province
of West Jersey |
Salem |
| Somerset |
1688 |
Middlesex |
Somerville |
| Sussex |
1753 |
Morris |
Newton |
| Union |
1857 |
Essex |
Elizabeth |
| Warren |
1824 |
Sussex |
Belvidere |
|
