NJ Counties
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Here, we’ll be taking a look at the NJ Counties. In New Jersey, there’re 21 counties and these counties together contain 565 municipalities made up of clearly defined territory including 250 boroughs, 52 cities, 15 towns, 244 townships, and 4 villages.

In the state of New Jersey, each county is a local level of government between the state and municipalities. In New Jersey, the county government is a Board of County Commissioners, sheriff, clerk, and surrogate (those responsible for uncontested and routine probate). All these county governments are elected officials.

Counties in New Jersey traditionally perform state-mandated duties like the maintenance of parks, jails, and certain roads.  

List of NJ Counties (In Alphabetical Order)

County Name County Seat FIPS Code Year Formed Population (as of 2019)
Atlantic County Mays Township 001 1837 263,670
Bergen County Hackensack 003 1683 932,202
Burlington County Mount Holly 005 1694 445,349
Camden County Camden               007 1844 506,471
Cape May County Cape May Court House 009 1692 92,039
Cumberland County Bridgeton 011 1748 149,527
Essex County Newark  013 1683 798,975
Gloucester County Woodbury 015 1686 291,636
Hudson County Jersey City 017 1840 672,391
Hunterdon County Flemington 019 1714 124,371
Mercer County Trenton 021 1838 367,430
Middlesex County New Brunswick 023 1683 825,062
Monmouth County Freehold Borough 025 1683 618,795
Morris County Morristown 027 1739 491,845
Ocean County Toms River 029 1850 607,186
Passaic County Paterson 031 1837 501,826
Salem County Salem 033 1694 62,385
Somerset Count                Somerville 035 1688 328,934
Sussex County Newton 037 1753 140,488
Union County Elizabeth 039 1857 556,341
Warren County Belvidere 041 1824 105,267

1. Atlantic County  

nj counties

Atlantic County is the 15th largest county in New Jersey formed from Gloucester County and named after the Atlantic Ocean which forms the county’s eastern border.

Its county seat is Mays Landing. Atlantic County forms the Atlantic City Hammonton Metropolitan Statistical Area which is also part of the Delaware Valley Combines Statistical Area.

Its largest city is Galloway Township with about 37, 349 people.

2. Bergen County  

nj counties

This is the most populous county in New Jersey with a population of 932,202 people. Bergen County is located in the northeastern part of New Jersey. It was founded in 1683 and named after Bergen, Norway, or Bergen North-Holland.

Bergen County seat is Hackensack and its largest municipality is Hackensack with about 43,010 people.

3. Burlington County  

nj counties

Burlington County is New Jersey’s largest county by area. It is the 11th largest county in New Jersey by population.

Burlington County was founded May 17, 1694, and named after Bridlington, England. Its county seat is Mount Holly and the largest city is Evesham Township (by population) and Washington Township (by area).

4. Camden County  

nj counties

Camden County is New Jersey’s eighth-largest county that was established March 13th, 1844 and its county seat is Camden. Its largest municipality by population is Camden and by area Winslow Township.

5. Cape May County  

nj counties

This is the southernmost county in New Jersey. Almost all of the county is located on the Cape May Peninsula and bounded by the Delaware Bay to the west and the Atlantic Ocean to the south and east.

Cape May County was established in 1685 and named after Cornelius Jacobsen Mey. Its county seat is Cape May Court House located in Middle Township. Its largest city by population is Lower Township and by area Middle Township.  

6. Cumberland County  

Cumberland County was established in 1748 and named after Prince William, Duke of Cumberland. Its county seat is Bridgeton and the largest municipality by area is Maurice River Township and by population Vineland.

7. Essex County  

This county is located in the northeastern part of the U.S. state of New Jersey that was formed in 1683. It is the 3rd most populous county in New Jersey with an estimated population of about 798,975.  

Essex County seat is Newark which is also the most populous city in the state. Essex County part of the New York Metropolitan Area.

8. Gloucester County  

nj counties

Gloucester County was founded in 1686 and named after Gloucester/Gloucestershire England. It is the fourteen most populous county in the U.S. state of New Jersey.

Its county seat is Woodbury and the largest city by population is Washington Township and by area Franklin Township.

9. Hudson County  

nj counties

Hudson County is located west of the lower Hudson River named after Henry Hudson (the sea captain who explored the area in 1609).

It was founded in 1840 and its county seat is Jersey City which is also the largest city.

10. Hunterdon County  

Hunterdon County is located in the western part of New Jersey and the 18th most populous county in the U.S. state of New Jersey.

It was founded in 1714 and named after Robert Hunter. Its county seat is Flemington and the largest city by population is Raritan Township and by area Readington Township.

11. Mercer County

nj counties

Mercer County seat is Trenton which is the state capital. It was established in 1838 and named after Continental Army General Hugh Mercer.

Its largest municipality by population is Hamilton Township and by area Hopewell Township.

12. Middlesex County  

This county is located in north-central New Jersey. Middlesex County was formed in 1683 and named after Historic English county of Middlesex.

Its county seat is New Brunswick and its largest city by population is Edison and Monroe Township by area.

13. Monmouth County  

nj counties

This county is located on the coast of New Jersey within the New York metropolitan area and the northernmost county along the Jersey Shore.

It was established in 1683 and named after Monmouthshire. Its county seat is Freehold Borough and the largest city by population is Middletown Township and by area Howell Township.

14. Morris County 

Morris County is located about 30 miles west of New York City. It was established in 1739 and named after Governor Lewis Morris.

Its county seat is Morristown and the largest city by population is Parsippany-Troy Hills Township and the largest city by area is Rockaway Township.  

15. Ocean County  

nj counties

This county is located along the Jersey Shore in the south-central part of New Jersey. It was founded in 1850 and named after the Atlantic Ocean.

Ocean County seat is Toms River and the largest city by population is Lakewood Township and by area Jackson Township.

16. Passaic County  

nj counties

This county was formed in 1837 and named after Pasaeck – a Lenape word which means Valley and it is part of the New York Metropolitan Area.

Its county seat is Paterson which is also the largest city by population. The largest city by area is West Milford.

17. Salem County  

nj counties

Salem County was founded in 1694. Its seat is Salem and the largest city is Pennsville Township. It is New Jersey’s least populous county with a population of 62,385.

18. Somerset County  

nj counties

This County is in the north-central portion of New Jersey. It is the 13th most populous state in New Jersey and its county seat is Somerville. Its largest city by population is Franklin Township and by area Hillsborough Township.  

19. Sussex County  

nj counties

This is the northernmost county in New Jersey with whose county seat is Newton. It is also part of the New York Metropolitan Area.

It was founded June 8, 1753 and its county seat is Newton. Its largest city by population and area is Vernon Township.

20. Union County  

nj counties

This county is in the northern part of New Jersey. It is New Jersey’s 7th most populous county. Union County was founded in 1857 and its county seat is Elizabeth which is also the largest city in the county.

21. Warren County  

nj counties

Warren County is the 19th most populous county in New Jersey. It was formed in 1824 and named after Joseph Warren. Its county seat is Belvidere and the largest city by population is Phillipsburg and by area Hardwick Township.  

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