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| Adams | Obama | 35.8% | 3,976 | | | Romney | 61.7% | 6,865 | | | Other | 2.5% | 277 | |
| Allen | Obama | 37.1% | 17,914 | | | Romney | 61.0% | 29,502 | | | Other | 1.9% | 925 | |
| Ashland | Obama | 34.0% | 8,281 | | | Romney | 63.8% | 15,519 | | | Other | 2.2% | 540 | |
| Ashtabula | Obama | 55.1% | 23,803 | | | Romney | 42.4% | 18,298 | | | Other | 2.5% | 1,099 | |
| Athens | Obama | 66.0% | 18,307 | | | Romney | 30.8% | 8,543 | | | Other | 3.2% | 878 | |
| Auglaize | Obama | 24.9% | 5,831 | | | Romney | 73.2% | 17,169 | | | Other | 1.9% | 447 | |
| Belmont | Obama | 44.7% | 14,156 | | | Romney | 52.9% | 16,758 | | | Other | 2.4% | 774 | |
| Brown | Obama | 36.6% | 7,107 | | | Romney | 61.4% | 11,916 | | | Other | 1.9% | 369 | |
| Butler | Obama | 36.6% | 62,388 | | | Romney | 61.7% | 105,176 | | | Other | 1.7% | 2,966 | |
| Carroll | Obama | 41.7% | 5,543 | | | Romney | 55.1% | 7,315 | | | Other | 3.2% | 426 | |
| Champaign | Obama | 38.1% | 7,044 | | | Romney | 59.8% | 11,045 | | | Other | 2.1% | 379 | |
| Clark | Obama | 48.7% | 31,297 | | | Romney | 49.5% | 31,820 | | | Other | 1.8% | 1,184 | |
| Clermont | Obama | 31.6% | 30,458 | | | Romney | 66.5% | 64,208 | | | Other | 1.9% | 1,859 | |
| Clinton | Obama | 31.8% | 5,791 | | | Romney | 66.0% | 12,009 | | | Other | 2.1% | 383 | |
| Columbiana | Obama | 42.9% | 19,821 | | | Romney | 54.7% | 25,251 | | | Other | 2.4% | 1,127 | |
| Coshocton | Obama | 44.0% | 6,940 | | | Romney | 53.2% | 8,390 | | | Other | 2.9% | 454 | |
| Crawford | Obama | 37.8% | 7,507 | | | Romney | 59.7% | 11,852 | | | Other | 2.5% | 488 | |
| Cuyahoga | Obama | 69.3% | 447,273 | | | Romney | 29.5% | 190,660 | | | Other | 1.1% | 7,329 | |
| Darke | Obama | 26.8% | 6,826 | | | Romney | 71.2% | 18,108 | | | Other | 2.0% | 496 | |
| Defiance | Obama | 42.2% | 7,732 | | | Romney | 55.5% | 10,176 | | | Other | 2.4% | 431 | |
| Delaware | Obama | 37.7% | 37,292 | | | Romney | 60.9% | 60,194 | | | Other | 1.4% | 1,413 | |
| Erie | Obama | 55.2% | 21,793 | | | Romney | 42.9% | 16,952 | | | Other | 1.9% | 755 | |
| Fairfield | Obama | 41.4% | 29,890 | | | Romney | 56.8% | 41,034 | | | Other | 1.8% | 1,296 | |
| Fayette | Obama | 38.5% | 4,249 | | | Romney | 60.0% | 6,620 | | | Other | 1.5% | 169 | |
| Franklin | Obama | 60.5% | 346,373 | | | Romney | 37.7% | 215,997 | | | Other | 1.7% | 9,818 | |
| Fulton | Obama | 42.6% | 9,073 | | | Romney | 55.1% | 11,738 | | | Other | 2.3% | 499 | |
| Gallia | Obama | 36.1% | 4,557 | | | Romney | 61.4% | 7,750 | | | Other | 2.5% | 315 | |
| Geauga | Obama | 38.5% | 19,659 | | | Romney | 59.8% | 30,589 | | | Other | 1.7% | 865 | |
| Greene | Obama | 38.6% | 32,256 | | | Romney | 59.6% | 49,819 | | | Other | 1.9% | 1,551 | |
| Guernsey | Obama | 44.2% | 7,450 | | | Romney | 53.4% | 8,993 | | | Other | 2.4% | 406 | |
| Hamilton | Obama | 52.5% | 219,927 | | | Romney | 46.2% | 193,326 | | | Other | 1.3% | 5,641 | |
| Hancock | Obama | 35.1% | 12,564 | | | Romney | 62.7% | 22,443 | | | Other | 2.2% | 776 | |
| Hardin | Obama | 37.0% | 4,619 | | | Romney | 60.1% | 7,489 | | | Other | 2.9% | 362 | |
| Harrison | Obama | 41.2% | 2,950 | | | Romney | 56.2% | 4,019 | | | Other | 2.6% | 184 | |
| Henry | Obama | 39.7% | 5,658 | | | Romney | 57.9% | 8,257 | | | Other | 2.4% | 342 | |
| Highland | Obama | 33.9% | 6,054 | | | Romney | 63.8% | 11,413 | | | Other | 2.3% | 412 | |
| Hocking | Obama | 48.2% | 6,157 | | | Romney | 49.2% | 6,285 | | | Other | 2.6% | 326 | |
| Holmes | Obama | 22.5% | 2,608 | | | Romney | 75.2% | 8,702 | | | Other | 2.2% | 257 | |
| Huron | Obama | 44.5% | 11,006 | | | Romney | 52.9% | 13,060 | | | Other | 2.6% | 645 | |
| Jackson | Obama | 38.5% | 5,166 | | | Romney | 59.0% | 7,904 | | | Other | 2.5% | 334 | |
| Jefferson | Obama | 46.4% | 15,385 | | | Romney | 51.3% | 17,034 | | | Other | 2.3% | 758 | |
| Knox | Obama | 36.8% | 10,470 | | | Romney | 60.7% | 17,266 | | | Other | 2.6% | 727 | |
| Lake | Obama | 48.6% | 57,680 | | | Romney | 49.5% | 58,744 | | | Other | 1.9% | 2,241 | |
| Lawrence | Obama | 41.4% | 10,744 | | | Romney | 56.5% | 14,651 | | | Other | 2.1% | 537 | |
| Licking | Obama | 41.9% | 34,201 | | | Romney | 55.8% | 45,503 | | | Other | 2.3% | 1,846 | |
| Logan | Obama | 33.3% | 7,062 | | | Romney | 64.3% | 13,633 | | | Other | 2.4% | 504 | |
| Lorain | Obama | 56.9% | 81,464 | | | Romney | 41.5% | 59,405 | | | Other | 1.7% | 2,383 | |
| Lucas | Obama | 64.9% | 136,616 | | | Romney | 33.2% | 69,940 | | | Other | 1.9% | 4,065 | |
| Madison | Obama | 39.0% | 6,845 | | | Romney | 58.9% | 10,342 | | | Other | 2.1% | 370 | |
| Mahoning | Obama | 63.4% | 77,059 | | | Romney | 35.1% | 42,641 | | | Other | 1.5% | 1,884 | |
| Marion | Obama | 45.6% | 12,504 | | | Romney | 52.0% | 14,265 | | | Other | 2.4% | 649 | |
| Medina | Obama | 42.7% | 38,785 | | | Romney | 55.4% | 50,418 | | | Other | 1.9% | 1,728 | |
| Meigs | Obama | 39.4% | 4,027 | | | Romney | 57.7% | 5,895 | | | Other | 2.9% | 296 | |
| Mercer | Obama | 21.9% | 4,745 | | | Romney | 76.4% | 16,561 | | | Other | 1.7% | 370 | |
| Miami | Obama | 31.5% | 16,383 | | | Romney | 66.5% | 34,606 | | | Other | 2.0% | 1,025 | |
| Monroe | Obama | 44.8% | 3,035 | | | Romney | 52.3% | 3,548 | | | Other | 2.9% | 199 | |
| Montgomery | Obama | 51.4% | 137,139 | | | Romney | 46.8% | 124,841 | | | Other | 1.8% | 4,727 | |
| Morgan | Obama | 45.9% | 2,814 | | | Romney | 51.8% | 3,179 | | | Other | 2.3% | 143 | |
| Morrow | Obama | 36.6% | 5,933 | | | Romney | 60.8% | 9,865 | | | Other | 2.6% | 419 | |
| Muskingum | Obama | 45.7% | 17,002 | | | Romney | 51.8% | 19,264 | | | Other | 2.5% | 913 | |
| Noble | Obama | 36.2% | 2,131 | | | Romney | 60.5% | 3,563 | | | Other | 3.3% | 197 | |
| Ottawa | Obama | 51.1% | 11,503 | | | Romney | 46.8% | 10,538 | | | Other | 2.1% | 464 | |
| Paulding | Obama | 38.7% | 3,538 | | | Romney | 58.5% | 5,354 | | | Other | 2.8% | 258 | |
| Perry | Obama | 46.8% | 7,033 | | | Romney | 50.8% | 7,627 | | | Other | 2.4% | 360 | |
| Pickaway | Obama | 40.1% | 9,684 | | | Romney | 58.1% | 14,037 | | | Other | 1.8% | 433 | |
| Pike | Obama | 49.0% | 5,684 | | | Romney | 49.0% | 5,685 | | | Other | 2.0% | 227 | |
| Portage | Obama | 51.7% | 39,453 | | | Romney | 46.1% | 35,242 | | | Other | 2.2% | 1,689 | |
| Preble | Obama | 30.7% | 6,211 | | | Romney | 66.9% | 13,535 | | | Other | 2.4% | 479 | |
| Putnam | Obama | 23.5% | 4,318 | | | Romney | 74.6% | 13,721 | | | Other | 2.0% | 361 | |
| Richland | Obama | 39.2% | 22,687 | | | Romney | 58.6% | 33,867 | | | Other | 2.2% | 1,252 | |
| Ross | Obama | 48.3% | 14,569 | | | Romney | 49.8% | 15,008 | | | Other | 1.9% | 583 | |
| Sandusky | Obama | 50.0% | 14,541 | | | Romney | 47.3% | 13,755 | | | Other | 2.7% | 799 | |
| Scioto | Obama | 48.2% | 15,077 | | | Romney | 49.6% | 15,492 | | | Other | 2.2% | 693 | |
| Seneca | Obama | 44.8% | 11,353 | | | Romney | 52.3% | 13,243 | | | Other | 2.9% | 747 | |
| Shelby | Obama | 26.5% | 6,343 | | | Romney | 71.7% | 17,142 | | | Other | 1.7% | 418 | |
| Stark | Obama | 49.2% | 89,432 | | | Romney | 48.7% | 88,581 | | | Other | 2.1% | 3,733 | |
| Summit | Obama | 57.0% | 153,041 | | | Romney | 41.4% | 111,001 | | | Other | 1.6% | 4,316 | |
| Trumbull | Obama | 60.5% | 61,672 | | | Romney | 37.5% | 38,279 | | | Other | 2.0% | 2,012 | |
| Tuscarawas | Obama | 44.1% | 18,407 | | | Romney | 53.3% | 22,242 | | | Other | 2.5% | 1,044 | |
| Union | Obama | 34.4% | 8,805 | | | Romney | 63.6% | 16,289 | | | Other | 2.1% | 529 | |
| Van Wert | Obama | 29.0% | 4,029 | | | Romney | 69.0% | 9,585 | | | Other | 2.0% | 284 | |
| Vinton | Obama | 44.4% | 2,436 | | | Romney | 52.0% | 2,856 | | | Other | 3.6% | 198 | |
| Warren | Obama | 29.6% | 32,909 | | | Romney | 68.9% | 76,564 | | | Other | 1.6% | 1,724 | |
| Washington | Obama | 39.4% | 11,651 | | | Romney | 58.4% | 17,284 | | | Other | 2.3% | 667 | |
| Wayne | Obama | 38.7% | 19,808 | | | Romney | 59.1% | 30,251 | | | Other | 2.2% | 1,106 | |
| Williams | Obama | 41.0% | 7,266 | | | Romney | 56.7% | 10,047 | | | Other | 2.2% | 393 | |
| Wood | Obama | 51.2% | 32,802 | | | Romney | 46.4% | 29,704 | | | Other | 2.4% | 1,553 | |
| Wyandot | Obama | 39.0% | 4,137 | | | Romney | 58.3% | 6,180 | | | Other | 2.7% | 285 | |
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