Midwest has 4 regions with 8, 4, 5, 5 stations each.
See combined Topo Map.
Region 1: Detroit, Flint, Bay City, Jackson, Lansing, Battlecreek, Kalamazoo, Grand Rapids
42.36, -83.16 Detroit 43, -83.75 Flint 43.58, -83.91 Bay City 42.25, -84.41 Jackson 42.75, -84.58 Lansing 42.33, -85.25 Battlecreek 42.33, -85.66 Kalamazoo 43, -85.75 Grand Rapids
Region 2: Toledo, Lima, Fort Wayne, South Bend
41.66, -83.58 Toledo 40.66, -84.08 Lima 41, -85.16 Fort Wayne 41.66, -86.33 South Bend
Region 3: Charleston, Columbus, Dayton, Cincinnati, Lexington
38.33, -81.58 Charleston 40, -83 Columbus 39.75, -84.25 Dayton 39.13, -84.5 Cincinnati 38.08, -84.5 Lexington
Region 4: Muncie, Louisville, Indianapolis, Terre Haute, Evansville
40.16, -85.5 Muncie 38.25, -85.75 Louisville 39.75, -86.13 Indianapolis 39.41, -87.41 Terre Haute 38, -87.5 Evansville