| | | Starke County | IN | 18149 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=StarkeCounty+IN |
| | | Switzerland County | IN | 18155 | | | | | nonmetro county (rural) | recreation | https://maps.google.com/?q=SwitzerlandCounty+IN |
| | | Union County | IN | 18161 | | | | | metro county (urban) | nonspecialized | https://maps.google.com/?q=UnionCounty+IN |
| | | Adams County | IN | 18001 | | Decatur, IN 19540 | Fort
Wayne-Huntington-Auburn,
IN 258 | Central | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=AdamsCounty+IN |
| | | Allen County | IN | 18003 | | Fort Wayne, IN 23060 | Fort
Wayne-Huntington-Auburn,
IN 258 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=AllenCounty+IN |
| | | Bartholomew County | IN | 18005 | | Columbus, IN 18020 | Indianapolis-Carmel-Muncie,
IN 294 | Central | metro county (urban) | manufacturing-dependent | https://maps.google.com/?q=BartholomewCounty+IN |
| | | Boone County | IN | 18011 | | Indianapolis-Carmel-Greenwood,
IN 26900 | Indianapolis-Carmel-Muncie,
IN 294 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=BooneCounty+IN |
| | | Cass County | IN | 18017 | | Logansport, IN 30900 | | Central | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=CassCounty+IN |
| | | Clark County | IN | 18019 | | Louisville/Jefferson
County, KY-IN 31140 | Louisville/Jefferson
County--Elizabethtown,
KY-IN 350 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=ClarkCounty+IN |
| | | Clinton County | IN | 18023 | | Frankfort, IN 23140 | Lafayette-West
Lafayette-Frankfort, IN 320 | Central | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=ClintonCounty+IN |
