| | Greene County | IN | 18055 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=GreeneCounty+IN |
| | Hamilton County | IN | 18057 | | Indianapolis-Carmel-Greenwood,
IN 26900 | Indianapolis-Carmel-Muncie,
IN 294 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=HamiltonCounty+IN |
| | Hancock County | IN | 18059 | | Indianapolis-Carmel-Greenwood,
IN 26900 | Indianapolis-Carmel-Muncie,
IN 294 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=HancockCounty+IN |
| | Hendricks County | IN | 18063 | | Indianapolis-Carmel-Greenwood,
IN 26900 | Indianapolis-Carmel-Muncie,
IN 294 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=HendricksCounty+IN |
| | Henry County | IN | 18065 | | New Castle, IN 35220 | Indianapolis-Carmel-Muncie,
IN 294 | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=HenryCounty+IN |
| | Jasper County | IN | 18073 | Lake County-Porter
County-Jasper County, IN 29414 | Chicago-Naperville-Elgin,
IL-IN 16980 | Chicago-Naperville,
IL-IN-WI 176 | Outlying | metro county (urban) | nonspecialized | https://maps.google.com/?q=JasperCounty+Indiana |
| | Johnson County | IN | 18081 | | Indianapolis-Carmel-Greenwood,
IN 26900 | Indianapolis-Carmel-Muncie,
IN 294 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=JohnsonCounty+IN |
| | Lake County | IN | 18089 | Lake County-Porter
County-Jasper County, IN 29414 | Chicago-Naperville-Elgin,
IL-IN 16980 | Chicago-Naperville,
IL-IN-WI 176 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=LakeCounty+Indiana |
| | LaPorte County | IN | 18091 | | Michigan City-La Porte,
IN 33140 | Chicago-Naperville,
IL-IN-WI 176 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=LaPorteCounty+IN |
| | Lawrence County | IN | 18093 | | Bedford, IN 13260 | Bloomington-Bedford, IN 144 | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=LawrenceCounty+IN |