I don’t know about WI, but where I live, cops won’t force anyone over 16 to go back to their parents.
If you have reasons for not talking to a school counselor, there may be private non-profit organizations in your area who can help you. Maybe you could ask your counselor about, say, resources for runaways without going into detail, or you could say you’re “asking for a friend.” Another option might be to call a suicide hotline, even though you are not suicidal (I hope). I looked into volunteering for one of those recently and learned that their training includes learning where to send people to get more help in their area.
One other option to consider: the armed forces, in particular, the Coast Guard Reserve or the Air National Guard (those are the most likely to teach you something useful without sending you to Afghanistan). This won’t help you right this minute, but if end up cutting ties with your family, you will need help later on. But only do this if the mission appeals to you; people who join just to pay for college are generally miserable in the service.
Edit: There is a “teen line” on this list of emergency numbers