| 216 | Ohio (Cleveland area) More information at: Area Code 216 Phone Number Blocks |
| 234 | Ohio (Youngstown, Warren, Akron, Canton and northeastern Ohio, overlays with 330) More information at: Area Code 234 Phone Number Blocks |
| 283 | Ohio (Cincinnati, Middletown, Hamilton, Norwood, Lebanon and southwestern Ohio. Overlay of code 283 postponed. Currently 513.) More information at: Area Code 283 Phone Number Blocks |
| 330 | Ohio (Youngstown, Warren, Akron, Canton and northeastern Ohio, overlays with 234) More information at: Area Code 330 Phone Number Blocks |
| 380 | Ohio This Area code is scheduled to provide numbering relief to Area code 614 but no date has been assigned for this to go into effect. More information at: Area Code 380 Phone Number Blocks |
| 419 | Ohio (Toledo, Sylvania, Mansfield, Lima, Findlay,Bryan, Sandusky, Bowling Green and northwestern Ohio, overlays with 567) More information at: Area Code 419 Phone Number Blocks |
| 440 | Ohio (Cleveland suburbs, Elyria, Lorain, Oberlin, Wellington and north central Ohio) More information at: Area Code 440 Phone Number Blocks |
| 513 | Ohio (Cincinnati, Middletown, Hamilton, Norwood, Lebanon and southwestern Ohio. Planned overlay with 283 is postponed) More information at: Area Code 513 Phone Number Blocks |
| 567 | Ohio (Toledo, Mansfield, Lima, Findlay, Bryan, Sandusky and northwestern Ohio, overlays with 419) More information at: Area Code 567 Phone Number Blocks |
| 614 | Ohio (Columbus area) More information at: Area Code 614 Phone Number Blocks |
| 740 | Ohio (Jackson, Lancaster, Marietta, Marion, Cambridge, Zanesville, New Castle, Athens, and southeastern Ohio) More information at: Area Code 740 Phone Number Blocks |
| 937 | Ohio (Marysville, Springfield, Dayton, Hillsboro and southwestern Ohio excluding Cincinnati area) More information at: Area Code 937 Phone Number Blocks |
