Idaho counties quiz

The 44 counties in the quiz

They’re the 44 counties of Idaho, as counted by the US Census Bureau. The state capital, Boise, is in Ada 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: Payette (407 sq mi), Teton (449 sq mi), and Madison (469 sq mi). Zoom in with the buttons or two fingers to tap them.

Tips to learn them

• Start with the three largest: Idaho, Owyhee, and Custer cover 25% of the area of Idaho.
• The 8 counties bordering Montana trace that border on the map: Bonner, Boundary, Clark, Clearwater, Fremont, Idaho, Lemhi, and Shoshone.
• Blaine has the most neighbors: it borders 9 counties. Once you place it, you have a landmark for many more.
• Ada is the most populous (546,141 people in 2025) and, together with Canyon and Kootenai, is home to 50% of Idaho’s people.

Playing in class

If you teach in Idaho, 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 44 counties

1. Ada pop. 546,141
2. Adams pop. 5,013
3. Bannock pop. 91,591
4. Bear Lake pop. 6,727
5. Benewah pop. 10,508
6. Bingham pop. 51,153
7. Blaine pop. 25,517
8. Boise pop. 8,545
9. Bonner pop. 54,420
10. Bonneville pop. 135,771
11. Boundary pop. 13,997
12. Butte pop. 2,783
13. Camas pop. 1,316
14. Canyon pop. 275,123
15. Caribou pop. 7,252
16. Cassia pop. 26,397
17. Clark pop. 783
18. Clearwater pop. 9,118
19. Custer pop. 4,636
20. Elmore pop. 29,465
21. Franklin pop. 15,889
22. Fremont pop. 14,208
23. Gem pop. 21,773
24. Gooding pop. 16,446
25. Idaho pop. 17,874
26. Jefferson pop. 35,297
27. Jerome pop. 26,362
28. Kootenai pop. 191,864
29. Latah pop. 41,842
30. Lemhi pop. 8,474
31. Lewis pop. 3,704
32. Lincoln pop. 5,603
33. Madison pop. 55,172
34. Minidoka pop. 22,911
35. Nez Perce pop. 42,905
36. Oneida pop. 5,085
37. Owyhee pop. 12,661
38. Payette pop. 27,824
39. Power pop. 8,246
40. Shoshone pop. 14,130
41. Teton pop. 13,254
42. Twin Falls pop. 97,539
43. Valley pop. 12,831
44. Washington pop. 11,583