Der US-Bundesstaat New Jersey gliedert sich in 21 Countys.
| Nr. * | County | Einwohner 1. Juli 2017 | Einwohner Zensus 2010 | Verwaltungssitz |
|---|---|---|---|---|
| 1 | Atlantic | 269.918 | 274.540 | Mays Landing |
| 2 | Bergen | 948.406 | 905.147 | Hackensack |
| 3 | Burlington | 448.596 | 448.738 | Mount Holly |
| 4 | Camden | 510.719 | 513.668 | Camden |
| 5 | Cape May | 93.553 | 97.265 | Cape May Court House |
| 6 | Cumberland | 152.538 | 156.628 | Bridgeton |
| 7 | Essex | 808.285 | 783.999 | Newark |
| 8 | Gloucester | 292.206 | 288.585 | Woodbury |
| 9 | Hudson | 691.643 | 634.244 | Jersey City |
| 10 | Hunterdon | 125.059 | 127.364 | Flemington |
| 11 | Mercer | 374.733 | 367.517 | Trenton |
| 12 | Middlesex | 842.798 | 809.864 | New Brunswick |
| 13 | Monmouth | 626.351 | 630.423 | Freehold |
| 14 | Morris | 499.693 | 492.315 | Morristown |
| 15 | Ocean | 597.943 | 576.548 | Toms River |
| 16 | Passaic | 512.607 | 501.622 | Paterson |
| 17 | Salem | 62.792 | 66.069 | Salem |
| 18 | Somerset | 335.432 | 323.428 | Somerville |
| 19 | Sussex | 141.682 | 148.886 | Newton |
| 20 | Union | 563.892 | 536.448 | Elizabeth |
| 21 | Warren | 106.798 | 108.655 | Belvidere |
* Nummerierung erfolgt lt. Darstellung auf der Karte