Zanesville is the ultimate "infill" market. By all rights, they should be part of the Columbus market, but WHIZ has been there forever, and it's kind of a legacy thing. Parkersburg, and to a lesser extent Lima, are also infill markets, as is Lafayette IN.
Infill markets are intriguing, in that they typically have a single news operation, and with the advent of subchannels and co-owned LPTVs, you get basically the same news on all channels. Harrisonburg VA is another case in point. You would think that Harrisonburg and Charlottesville would be a single market, but except for one year back in the 1980s, they've always been separate.