New Jersey counties quiz

The 21 counties in the quiz

They’re the 21 counties of New Jersey, as counted by the US Census Bureau. The state capital, Trenton, is in Mercer County.

How to play

In Point mode we name a county and you tap it on the map; in Type mode one lights up and you type its name (accents don’t matter); and in Time trial you get 6 seconds per question. If you miss, we show you where it was, which way it lies and a hint drawn from the data: its size rank and its neighbors.

Each game has 10, 20 or all the questions, and at the end you can practice just the ones you missed. Your best score for each mode is saved in this browser only: neither we nor anyone else can see it, and there’s no sign-up.

The hardest ones

The smallest counties are the hardest, since they barely show on the map: Hudson (46 sq mi), Union (103 sq mi), and Essex (126 sq mi). Zoom in with the buttons or two fingers to tap them.

Tips to learn them

• Start with the three largest: Burlington, Ocean, and Atlantic cover 27% of the area of New Jersey.
• The 7 counties bordering Pennsylvania trace that border on the map: Burlington, Camden, Gloucester, Hunterdon, Mercer, Sussex, and Warren.
• 10 of the 21 have no coastline: Bergen, Burlington, Camden, Hunterdon, Mercer, Morris, Passaic, Somerset, Sussex, and Warren.
• Morris has the most neighbors: it borders 7 counties. Once you place it, you have a landmark for many more.
• Bergen is the most populous (977,026 people in 2025) and, together with Essex and Middlesex, is home to 29% of New Jersey’s people.

Playing in class

If you teach in New Jersey, start with your school’s county and its neighbors and add a few each day. Otherwise, it’s a good way to get to know the state before studying it.

With the Challenge your class link, everyone gets the same questions in the same order, with no accounts or passwords, and each student sees their own score, time and streak. To practice on paper, there’s a printable worksheet of the same map with an answer key.

List of all 21 counties

1. Atlantic pop. 278,657
2. Bergen pop. 977,026
3. Burlington pop. 481,439
4. Camden pop. 535,799
5. Cape May pop. 93,390
6. Cumberland pop. 157,148
7. Essex pop. 896,379
8. Gloucester pop. 312,638
9. Hudson pop. 735,033
10. Hunterdon pop. 131,781
11. Mercer pop. 399,289
12. Middlesex pop. 883,335
13. Monmouth pop. 651,035
14. Morris pop. 524,251
15. Ocean pop. 673,746
16. Passaic pop. 531,624
17. Salem pop. 66,280
18. Somerset pop. 356,486
19. Sussex pop. 148,063
20. Union pop. 601,863
21. Warren pop. 112,953