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U. S. Senator - Republican: May 4, 2010
Official Results
| County | Rob Portman |
|---|---|
| Republican | |
| Adams | 2,130 |
| Allen | 9,753 |
| Ashland | 4,264 |
| Ashtabula | 5,518 |
| Athens | 1,569 |
| Auglaize | 2,929 |
| Belmont | 2,724 |
| Brown | 2,575 |
| Butler | 29,036 |
| Carroll | 1,981 |
| Champaign | 3,340 |
| Clark | 9,477 |
| Clermont | 13,127 |
| Clinton | 3,756 |
| Columbiana | 5,967 |
| Coshocton | 2,873 |
| Crawford | 2,968 |
| Cuyahoga | 44,854 |
| Darke | 4,879 |
| Defiance | 2,503 |
| Delaware | 15,420 |
| Erie | 3,845 |
| Fairfield | 10,128 |
| Fayette | 1,851 |
| Franklin | 62,494 |
| Fulton | 3,009 |
| Gallia | 1,917 |
| Geauga | 6,873 |
| Greene | 13,405 |
| Guernsey | 1,783 |
| Hamilton | 50,284 |
| Hancock | 7,097 |
| Hardin | 2,586 |
| Harrison | 836 |
| Henry | 1,676 |
| Highland | 3,180 |
| Hocking | 1,201 |
| Holmes | 2,275 |
| Huron | 2,160 |
| Jackson | 2,450 |
| Jefferson | 2,670 |
| Knox | 5,351 |
| Lake | 9,619 |
| Lawrence | 2,085 |
| Licking | 16,411 |
| Logan | 4,529 |
| Lorain | 12,229 |
| Lucas | 14,792 |
| Madison | 3,914 |
| Mahoning | 7,421 |
| Marion | 4,307 |
| Medina | 12,174 |
| Meigs | 1,503 |
| Mercer | 2,365 |
| Miami | 9,009 |
| Monroe | 536 |
| Montgomery | 34,120 |
| Morgan | 1,458 |
| Morrow | 2,870 |
| Muskingum | 5,472 |
| Noble | 1,197 |
| Ottawa | 2,499 |
| Paulding | 1,418 |
| Perry | 1,629 |
| Pickaway | 3,763 |
| Pike | 988 |
| Portage | 6,334 |
| Preble | 3,871 |
| Putnam | 2,053 |
| Richland | 8,064 |
| Ross | 3,769 |
| Sandusky | 4,120 |
| Scioto | 3,116 |
| Seneca | 5,018 |
| Shelby | 2,914 |
| Stark | 25,796 |
| Summit | 22,481 |
| Trumbull | 6,543 |
| Tuscarawas | 3,234 |
| Union | 5,250 |
| Van Wert | 3,422 |
| Vinton | 884 |
| Warren | 22,258 |
| Washington | 4,229 |
| Wayne | 8,868 |
| Williams | 2,423 |
| Wood | 6,269 |
| Wyandot | 1,431 |
| Total | 667,369 |
| Percentage of Votes | 100 |