County	Date 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