| | 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 |
| | Benton County | IN | 18007 | | Lafayette-West Lafayette,
IN 29200 | Lafayette-West
Lafayette-Frankfort, IN 320 | Outlying | metro county (urban) | farm-dependent | https://maps.google.com/?q=BentonCounty+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 |
| | Brown County | IN | 18013 | | Indianapolis-Carmel-Greenwood,
IN 26900 | Indianapolis-Carmel-Muncie,
IN 294 | Outlying | metro county (urban) | recreation | https://maps.google.com/?q=BrownCounty+IN |
| | Carroll County | IN | 18015 | | Lafayette-West Lafayette,
IN 29200 | Lafayette-West
Lafayette-Frankfort, IN 320 | Outlying | metro county (urban) | manufacturing-dependent | https://maps.google.com/?q=CarrollCounty+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 |
| | Clay County | IN | 18021 | | Terre Haute, IN 45460 | | Outlying | metro county (urban) | manufacturing-dependent | https://maps.google.com/?q=ClayCounty+IN |
| | Dearborn County | IN | 18029 | | Cincinnati, OH-KY-IN 17140 | Cincinnati-Wilmington,
OH-KY-IN 178 | Outlying | metro county (urban) | recreation | https://maps.google.com/?q=DearbornCounty+IN |
| | Delaware County | IN | 18035 | | Muncie, IN 34620 | Indianapolis-Carmel-Muncie,
IN 294 | Central | metro county (urban) | federal/state
government-dependent | https://maps.google.com/?q=DelawareCounty+IN |