13. Mount Horeb is the Troll Capital of the World and home to the Mustard Museum (see below.)
16. Belleville is the Unidentified Flying Object Capital of Wisconsin.
17. Potosi is the Catfish Capital of the state.
19. Wisconsin is the dairy capital of the United States
24. Bloomer is the Jump Rope Capital of the World.
27. Somerset is the Inner Tubing Capital of the World.
32. Boscobeel is the Turkey Capital of the state.
35. Monroe is the Swiss Cheese Capital of the World.
36. Mercer is the Loon Capital of the World.
41. Eagle River is known as the Snowmobile Capital of the World.
43. Bonduel is the Spelling Capital of Wisconsin.
44. Muscoda is the Morel Mushroom Capital of Wisconsin.
47. Sturgeon Bay is the Shipbuilding Capital of the Great Lakes.
48. Sheboygan is the Bratwurst Capital of the World.
50. Green Bay is the Toilet Paper Capital of the World.
I think someone has figured it out . . . don't use the words largest, smallest, first or only; use the word "capital". ;^)
BTW, do you know what Madison is the Capital of?