De Amerikaanse staat New Jersey is onderverdeeld in 21 county's.
right|300px|thumb|County's van New Jersey
CountyInwonersU.S. Census Bureau: Annual Estimates of the Population for Counties: April 1, 2000 to July 1, 20071 juli 2007HoofdplaatsInwonersU.S. Census Bureau: Population Estimates for All Places: 2000 to 20071 juli 2007Atlantic270.644Mays Landing2.482Bergen895.744Hackensack43.062Burlington446.817Mount Holly10.335Camden513.769Camden78.675Cape May96.422Cape May Court House4.433Cumberland155.544Bridgeton24.575Essex776.087Newark280.135Gloucester285.853Woodbury10.457Hudson598.160Jersey City242.389Hunterdon129.348Flemington4.237Mercer365.449Trenton82.804Middlesex788.629New Brunswick50.534Monmouth642.030Freehold11.465Morris488.475Morristown19.122Ocean565.493Toms River95.035Passaic492.115Paterson146.545Salem66.016Salem5.678Somerset323.552Somerville12.682Sussex151.478Newton8.167Union524.658Elizabeth124.862Warren109.737Belvidere2.645
New Jersey