Hi,
I would start with the county office. It could either be Walworth County or Kenosha County since one mile east is practically on the county line.
Either place would have public records for the county sherriff, which I would assume is what you're looking for.
A quick google turned up this:
http://www.co.walworth.wi.us/Sheriff/Website/faq.htm (broken link)
http://www.kccjs.org
Good luck.