| | | Allen County | OH | 39003 | | Lima, OH 30620 | Lima-Van Wert-Celina, OH 338 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=AllenCounty+OH |
| | | Belmont County | OH | 39013 | | Wheeling, WV-OH 48540 | | Central | metro county (urban) | mining-dependent | https://maps.google.com/?q=BelmontCounty+OH |
| | | Brown County | OH | 39015 | | Cincinnati, OH-KY-IN 17140 | Cincinnati-Wilmington,
OH-KY-IN 178 | Outlying | metro county (urban) | nonspecialized | https://maps.google.com/?q=BrownCounty+OH |
| | | Butler County | OH | 39017 | | Cincinnati, OH-KY-IN 17140 | Cincinnati-Wilmington,
OH-KY-IN 178 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=ButlerCounty+OH |
| | | Carroll County | OH | 39019 | | Canton-Massillon, OH 15940 | Cleveland-Akron-Canton,
OH 184 | Outlying | metro county (urban) | nonspecialized | https://maps.google.com/?q=CarrollCounty+OH |
| | | Clark County | OH | 39023 | | Springfield, OH 44220 | Dayton-Springfield-Kettering,
OH 212 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=ClarkCounty+OH |
| | | Clermont County | OH | 39025 | | Cincinnati, OH-KY-IN 17140 | Cincinnati-Wilmington,
OH-KY-IN 178 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=ClermontCounty+OH |
| | | Cuyahoga County | OH | 39035 | | Cleveland, OH 17410 | Cleveland-Akron-Canton,
OH 184 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=CuyahogaCounty+OH |
| | | Delaware County | OH | 39041 | | Columbus, OH 18140 | Columbus-Marion-Zanesville,
OH 198 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=DelawareCounty+OH |
| | | Fairfield County | OH | 39045 | | Columbus, OH 18140 | Columbus-Marion-Zanesville,
OH 198 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=FairfieldCounty+OH |
