The Wiffle Ball factory is located in Shelton, Connecticut. The factory is a smallish red brick building with a giant sign that says "Wiffle Ball" in the shape of a wiffle ball. It's really a rather unobtrusive building, and not at all what you would expect from a company that manufactures an item that is recognized across the country. Of course, since I drive by it every day on my way to work, my opinion might be jaded.
I've heard that if you go on a tour there, you get a free wiffle ball and bat. That might just be hearsay, as I've never toured the company.