I don't think this one will be easy. Now if we go by market, then that would make it easier to list.
For Chicago, WLIT still manages to do well in the AC category, despite losing ratings in the last few years.
For Milwaukee, that would be WLDB by default, because there's no other AC station that covers the entire market. The only other AC station is WEZY out of Racine, WI, but they're only marketing themselves to Racine & Kenosha Counties of Wisconsin, & not trying to make themselves to be a Milwaukee station (their signal only covers the southern part of the market with Grade B coverage over Milwaukee). WLDM (as WJZI) slowly migrated to AC after CC's WLTQ changed formats in 2004, since Milwaukee had 2 Hot AC stations at the time (WMYX, which is still on, & WKTI, but now WLWK), & WLTQ's rating took a sharp drop, due to sounding more like a Hot AC station, but with 70's music in the mix.