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List of counties in New Jersey facts for kids

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Counties of New Jersey
Sussex County Essex County Passaic County Bergen County Warren County Morris County Hunterdon County Somerset County Hudson County Union County Middlesex County Mercer County Monmouth County Ocean County Burlington County Atlantic County Camden County Gloucester County Salem County Cumberland County Cape May CountyNew Jersey Counties
A clickable New Jersey county map
Clickable map of New Jersey counties
Location New Jersey
Number 21
Populations 65,338 (Salem) – 957,736 (Bergen)
Areas 47 square miles (120 km2) (Hudson) – 805 square miles (2,080 km2) (Burlington)
Government County government
Subdivisions Boroughs, cities, towns, townships, and villages

There are 21 counties in the U.S. state of New Jersey. These counties together contain 564 municipalities, or administrative entities composed of clearly defined territory; 252 boroughs, 52 cities, 15 towns, 241 townships, and 4 villages. In New Jersey, a county is a local level of government between the state and municipalities. County government in New Jersey includes a Board of County Commissioners, sheriff, clerk, and surrogate (responsible for uncontested and routine probate), all of which are elected officials. Counties organized under the Optional County Charter Law may also have an elected county executive. Counties traditionally perform state-mandated duties such as the maintenance of jails, parks, and certain roads. The site of a county's administration and courts is called the county seat.

History

See also: History of New Jersey

New Jersey was governed by two groups of proprietors as two distinct provinces, East Jersey and West Jersey, between 1674 and 1702. New Jersey's first counties were created as administrative districts within each province, with East Jersey split in 1675 into Bergen, Essex, Middlesex and Monmouth counties, while West Jersey's initial counties of Burlington and Salem date to 1681. The most recent county created in New Jersey is Union County, created in 1857 and named after the union of the United States when the Civil War was imminent. New Jersey's county names derive from several sources, though most of its counties are named after place names in England and prominent leaders in the colonial and revolutionary periods. Bergen County is the most populous county—as of the 2010 Census—with 905,116 people, while Salem County is the least populous with 66,083 people.

New Jersey legislature representation

Until the 1960s, the New Jersey Senate had 21 representatives, one from each county regardless of population. In the wake of the 1964 decision by the Supreme Court of the United States in Reynolds v. Sims, establishing the one man, one vote principle that state legislative districts must be approximately equal in size, David Friedland filed suit in New Jersey Supreme Court on behalf of two union leaders, challenging a system under which each county was represented by a single member in the New Jersey Senate. The court ruled unanimously that the existing system was unconstitutional, ordered that interim measures be established by statute for the 1965 legislative elections, and ordered that the needed constitutional changes to restructure the New Jersey Legislature to be in compliance with "one man, one vote" requirements be in place before elections took place in 1967. The senate unilaterally—by internal rule, not by statute—enacted a proposal whereby each senator's vote would be weighted based on the population of the county represented, under which Cape May County's senator would receive one vote while the senator from Essex County would receive 19.1 votes, in direct relation to the ratio of residents between counties. The Supreme Court ruled unanimously that it was unconstitutional for the senate to adopt a weighted voting system unilaterally. In 1966, the constitution was amended to establish 40 districts statewide, each represented by one senator and two assembly members, without relation to county boundaries.

FIPS code

NJ Counties by Population (2020 census)
New Jersey counties by population as of 2020 with darker colors indicating a higher population

The Federal Information Processing Standard (FIPS) code, used by the United States government to uniquely identify counties, is provided with each entry. FIPS codes are five-digit numbers; for New Jersey the codes start with 34 and are completed with the three-digit county code. The FIPS code for each county in the table links to census data for that county.

List of counties

County
 FIPS code County seat Largest City Est. Formed from Named for Density (per mi2) Pop. Area Map
 
Atlantic County 001 Mays Landing Egg Harbor Township 47,842 1837 Gloucester County The Atlantic Ocean, which forms the county's eastern border 490.58 &&&&&&&&&0275213.&&&&&0275,213 &&&&&&&&&&&&0561.&&&&&0561 sq mi
(&&&&&&&&&&&01453.&&&&&01,453 km2)		 A county in the southeast part of the state. It is medium in size.
Bergen County 003 Hackensack Hackensack 46,030 1683 One of four original counties created in East Jersey Bergen, New Netherland settlement 4,092.89 &&&&&&&&&0957736.&&&&&0957,736 &&&&&&&&&&&&0234.&&&&&0234 sq mi
(&&&&&&&&&&&&0606.&&&&&0606 km2)		 A county in the northeast part of the state. It is small.
Burlington County 005 Mount Holly Evesham Township 46,826 1694 One of two original counties created in West Jersey The old ancient name for an inland market near Bridlington, England 582.82 &&&&&&&&&0469167.&&&&&0469,167 &&&&&&&&&&&&0805.&&&&&0805 sq mi
(&&&&&&&&&&&02085.&&&&&02,085 km2)		 A county in the southern part of the state. It gets wider as it goes northeast. It is one of the largest counties.
Camden County 007 Camden Cherry Hill 74,553 1844 Gloucester County Charles Pratt, 1st Earl Camden (1714–1794), an English supporter of the colonists during the American Revolution 2,374.76 &&&&&&&&&0527196.&&&&&0527,196 &&&&&&&&&&&&0222.&&&&&0222 sq mi
(&&&&&&&&&&&&0575.&&&&&0575 km2)		 A county in the southwest part of the state. It is very small.
Cape May County 009 Cape May Court House Lower Township 22,057 1692 Burlington County Cape May, named in turn for the 17th-century Dutch explorer Cornelius Jacobsen Mey, who explored and surveyed the Delaware Bay to the south of the county 371.02 &&&&&&&&&&094610.&&&&&094,610 &&&&&&&&&&&&0255.&&&&&0255 sq mi
(&&&&&&&&&&&&0660.&&&&&0660 km2)		 A county the makes up the southern tip of the state. It is one of the smallest.
Cumberland County 011 Bridgeton Vineland 60,780 1748 Salem County Prince William, Duke of Cumberland (1721–1765), second son of George II of Great Britain and military victor at the Battle of Culloden in 1746 311.51 &&&&&&&&&0152326.&&&&&0152,326 &&&&&&&&&&&&0489.&&&&&0489 sq mi
(&&&&&&&&&&&01267.&&&&&01,267 km2)		 A county in the southern part of the state, west of the tip. It is averagely sized.
Essex County 013 Newark Newark 311,549 1683 One of four original counties created in East Jersey The county of Essex in England 6,754.90 &&&&&&&&&0851117.&&&&&0851,117 &&&&&&&&&&&&0126.&&&&&0126 sq mi
(&&&&&&&&&&&&0326.&&&&&0326 km2)		 A county in the northeast part of the state. It is one of the smallest.
Gloucester County 015 Woodbury Washington Township 48,677 1686 Burlington County The city of Gloucester, England 948.99 &&&&&&&&&0308423.&&&&&0308,423 &&&&&&&&&&&&0325.&&&&&0325 sq mi
(&&&&&&&&&&&&0842.&&&&&0842 km2)		 A county in the southwest part of the state. It is averagely sized.
Hudson County 017 Jersey City Jersey City 292,449 1840 Bergen County The English explorer Henry Hudson (d. 1611), who explored portions of New Jersey's coastline 15,010.04 &&&&&&&&&0705472.&&&&&0705,472 &&&&&&&&&&&&&047.&&&&&047 sq mi
(&&&&&&&&&&&&0122.&&&&&0122 km2)		 A county in the northeast part of the state. It is the smallest county.
Hunterdon County 019 Flemington Raritan Township 23,447 1714 Burlington County Robert Hunter (1664–1734), the Colonial Governor of New Jersey from 1710 to 1720 302.75 &&&&&&&&&0130183.&&&&&0130,183 &&&&&&&&&&&&0430.&&&&&0430 sq mi
(&&&&&&&&&&&01114.&&&&&01,114 km2)		 A county in the west part of the state, just north of the divide between north and south. It is averagely sized.
Mercer County 021 Trenton Hamilton Township 92,297 1838 Burlington County, Hunterdon County, Middlesex County, and Somerset County The Continental Army General Hugh Mercer (1726–1777), who died at the Battle of Princeton 1,688.81 &&&&&&&&&0381671.&&&&&0381,671 &&&&&&&&&&&&0226.&&&&&0226 sq mi
(&&&&&&&&&&&&0585.&&&&&0585 km2)		 A county in the western part of the state, just above an indentation. It is small compared to its neighbors.
Middlesex County 023 New Brunswick Edison 107,588 1683 One of four original counties created in East Jersey The historic county of Middlesex in England 2,776.92 &&&&&&&&&0863623.&&&&&0863,623 &&&&&&&&&&&&0311.&&&&&0311 sq mi
(&&&&&&&&&&&&0805.&&&&&0805 km2)		 A county in the northern part of the state. It is averagely sized.
Monmouth County 025 Freehold Borough Middletown Township 67,106 1683 One of four original counties created in East Jersey The historic County of Monmouth in Great Britain 1,361.86 &&&&&&&&&0642799.&&&&&0642,799 &&&&&&&&&&&&0472.&&&&&0472 sq mi
(&&&&&&&&&&&01222.&&&&&01,222 km2)		 A county in the central-western part of the state. It is averagely sized and gets skinnier in the west.
Morris County 027 Morristown Parsippany-Troy Hills 56,162 1739 Hunterdon County Colonel Lewis Morris (1671–1746), colonial governor of New Jersey at the time of the county's formation 1,096.85 &&&&&&&&&0514423.&&&&&0514,423 &&&&&&&&&&&&0469.&&&&&0469 sq mi
(&&&&&&&&&&&01215.&&&&&01,215 km2)		 A county in the northern part of the state, landlocked by other counties. It is well-sized.
Ocean County 029 Toms River Lakewood Township 135,158 1850 Monmouth County and Burlington County The Atlantic Ocean, which forms the eastern border of New Jersey 1,036.47 &&&&&&&&&0659197.&&&&&0659,197 &&&&&&&&&&&&0636.&&&&&0636 sq mi
(&&&&&&&&&&&01647.&&&&&01,647 km2)		 A county in the southeast part of the state. It is large and gets skinnier in the south.
Passaic County 031 Paterson Paterson 159,732 1837 Bergen County and Essex County Pasaeck, a Lenape word meaning "valley" 2,775.11 &&&&&&&&&0513395.&&&&&0513,395 &&&&&&&&&&&&0185.&&&&&0185 sq mi
(&&&&&&&&&&&&0479.&&&&&0479 km2)		 A county in the north-central part of the state. It is small, and has two wide parts with a skinny area between them.
Salem County 033 Salem Pennsville Township 12,684 1694 One of two original counties created in West Jersey Salem, Biblical town, which takes its name from the Hebrew word for "peace." 193.31 &&&&&&&&&&065338.&&&&&065,338 &&&&&&&&&&&&0338.&&&&&0338 sq mi
(&&&&&&&&&&&&0875.&&&&&0875 km2)		 A county in the southwest part of the state. It is averagely sized.
Somerset County 035 Somerville Franklin Township 68,364 1688 Middlesex County The county of Somerset in England 1,143.74 &&&&&&&&&0348842.&&&&&0348,842 &&&&&&&&&&&&0305.&&&&&0305 sq mi
(&&&&&&&&&&&&0790.&&&&&0790 km2)		 A county landlocked by other counties in the northern part of the state. It is small.
Sussex County 037 Newton Vernon Township 22,358 1753 Morris County The county of Sussex in England 280.48 &&&&&&&&&0146132.&&&&&0146,132 &&&&&&&&&&&&0521.&&&&&0521 sq mi
(&&&&&&&&&&&01349.&&&&&01,349 km2)		 A county in the northwest corner of the state. It is larger than most surrounding counties.
Union County 039 Elizabeth Elizabeth 137,298 1857 Essex County The union of the United States, which was being threatened by the dispute over slavery 5,560.45 &&&&&&&&&0572726.&&&&&0572,726 &&&&&&&&&&&&0103.&&&&&0103 sq mi
(&&&&&&&&&&&&0267.&&&&&0267 km2)		 A county in the northeast part of the state, on an indentation. It is one of the smallest counties.
Warren County 041 Belvidere Phillipsburg 15,249 1824 Sussex County The American Revolutionary War General Joseph Warren (1741–1775), killed at the Battle of Bunker Hill 310.76 &&&&&&&&&0111252.&&&&&0111,252 &&&&&&&&&&&&0358.&&&&&0358 sq mi
(&&&&&&&&&&&&0927.&&&&&0927 km2)		 A county in the northwest part of the state. It is averagely sized.

See also

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