What's the difference? The local food market sells both - they look (orange cheese) and taste the same to me. Maybe I just don't have a sensitive enough palate to taste the difference, if there is one.

I'm not the cheese expert, but colby is a kind of cheese, compared to say cheddar or mozzarella. Anything labeled Wisconsin to me would just indicate that it was made in Wisconsin. So, take another look at the package and see if they are actually the same "kind" of cheese.

I agree w/FFG, read the package again.
I think colby is sort of a blah cheese. I prefer something with more flavor than colby has...like sharp cheddar, smoked gouda, even edam has more flavor to me.

Colby cheese is milder than cheddar cheese. It was developed by a cheesemaker in Wisconsin in the late 1880's. He named the cheese after the first dairy they owned which was located in Colby, Wisconsin. Wisconsin makes over 600 varieties of cheese. I don't think there is a cheese called Wisconsin cheese. The state or country where a cheese is produced will be listed on a package. The three cheese producing state's that I'm aware of are Wisconsin, California and New York.

Colby is a really good mild cheese. I like to make pimento cheese with it or a mild cheddar. Actually, I like a sharp cheddar for pimento cheese, but not everyone does...

I think most states have some cheese producer. We toured a very fine place in Vermont (can't remember the name) and there are producers that I know of in Michigan and Missouri as well. Some are only local (and make some very fine cheese) and some ship international.

"Colby is a mild, whole-milk cheddar cheese that has a softer, more open texture than regular cheddar. Because it's a high-moisture cheese, it doesn't keep as well as other cheddars. Colby is popular for eating out of hand, in sandwiches and for cooking."
I love it as it is the cheese from my childhood.

My DH came home with a hunk of Colby not long ago. He had no idea what he was buying as he thought it was like Monterey Jack.
That stuff was not worthy of the calories (very blah/bland), at least the Kraft variety. It hit the trash in a couple of weeks, as even he refused to use or eat it.

What everyone else said. Colby is a type of cheese. Wisconsin is a cheese producing state.