I'd say that a majority of DMAs that are 50+ are hyphenated. But some markets appear more "thrown together" than others. Rochester-Mason City-Austin above is one. Cape Girardeau-Paducah-Harrisbur is another. Then there is the mess more easily described as "Greater Nebraska:" Lincoln-Grand Island-Kearney-Hastings. Two separate ABC affiliates, one in Lincoln (a relatively recent move-in in the last 15 years or so) and the other in Hastings. OK...here goes, and mind you, I've never lived in Nebraska, but grew up in Iowa so accuracy might not be the best:
CBS: KOLN 10 Lincoln, with satellite KGIN 11 Grand Island
NBC: KHAS 5 Hastings. As far as I know, KHAS doesn't have a translator or satellite in Lincoln
ABC: KHGI 13 Kearney, with satellite KWNB 6 Hayes Center
Fox: KFXL 51 Lincoln. Fox used to be seen on KTVG 17 Grand Island, but that station supposedly went dark in 2010. KSNB 4 Superior used to be a satellite of KTVG, providing Fox to the Lincoln area, but its choice to return to RF channel 4 upon the DTV conversion apparently doomed it.
ABC used to be on four stations in Nebraska, billed as NTV. Today NTV is just KHGI and KWNB, but once upon a time it included channel 8 at Albion, a small town 60 miles NW of Grand Island which became the move-in KLKN Lincoln and is now separately owned, and KSNB 4 Superior which was changed from ABC to Fox in the 90s.
If it weren't for KOLN-KGIN, 10/11, Lincoln would likely have been part of the Omaha market. If I remember the story right, KOLN was very concerned that it would indeed get sucked into the Omaha market, only about 50 miles away. KOLN started out life on channel 12, then donated that station to the University of nebraska after KOLN received a CP to move to 10.
So, Lincoln has hometown CBS, ABC and recently FOX. NBC over the air is from KMTV 3 Omaha, and in addition FOX covers Lincoln quite well with KPTM 42 Omaha, with a fairly tall tower 20 miles SW of Omaha, which I believe is the only big 4 affiliate that city grades both Omaha and Lincoln.
What a monstrosity!