| Rank | Congressional District | Population (2012) |
|---|---|---|
| 1 | Ohio 12th Congressional District | 738,859 |
| 2 | Ohio 3rd Congressional District | 733,584 |
| 3 | Ohio 1st Congressional District | 731,181 |
| 4 | Ohio 7th Congressional District | 726,927 |
| 5 | Ohio 5th Congressional District | 726,090 |
| 6 | Ohio 15th Congressional District | 726,053 |
| 7 | Ohio 8th Congressional District | 724,285 |
| 8 | Ohio 16th Congressional District | 722,292 |
| 9 | Ohio 10th Congressional District | 721,777 |
| 10 | Ohio 14th Congressional District | 720,576 |
| 11 | Ohio 4th Congressional District | 718,059 |
| 12 | Ohio 6th Congressional District | 716,828 |
| 13 | Ohio 13th Congressional District | 716,143 |
| 14 | Ohio 2nd Congressional District | 713,709 |
| 15 | Ohio 9th Congressional District | 709,603 |
| 16 | Ohio 11th Congressional District | 698,259 |
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