The largest county in New Jersey

There are two right answers. By land area it is Burlington County; by population it is Bergen County. Which one you want depends on what you meant by largest.

Largest by land area

Burlington County

799.3 sq mi

10.9% of New Jersey's land

Largest by population

Bergen County

977,026 people

10.2% of New Jersey's population

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025. Retrieved 30 August 2026.

By land area

The ten largest counties of New Jersey by land area. Land area excludes inland and coastal water.
RankNameLand areaPopulation
1Burlington County799.3 sq mi481,439
2Ocean County628.3 sq mi673,746
3Atlantic County555.6 sq mi278,657
4Sussex County518.5 sq mi148,063
5Cumberland County483.4 sq mi157,148
6Monmouth County468.2 sq mi651,035
7Morris County461 sq mi524,251
8Hunterdon County427.8 sq mi131,781
9Warren County356.5 sq mi112,953
10Salem County331.9 sq mi66,280

By population

The ten most populous counties of New Jersey, from the Census Bureau's Vintage 2025 estimates.
RankNamePopulationDensity
1Bergen County977,0264,197 per sq mi
2Essex County896,3797,109 per sq mi
3Middlesex County883,3352,856 per sq mi
4Hudson County735,03315,912 per sq mi
5Ocean County673,7461,072 per sq mi
6Monmouth County651,0351,390 per sq mi
7Union County601,8635,857 per sq mi
8Camden County535,7992,420 per sq mi
9Passaic County531,6242,856 per sq mi
10Morris County524,2511,137 per sq mi

And the smallest

Smallest by land area

Hudson County

46.2 sq mi

Least populous

Salem County

66,280 people

More on New Jersey

Rebuilt from source data 30 August 2026. How these figures are produced.