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County results
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| Elections in Ohio |
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The 1840 Ohio gubernatorial election was held on October 13, 1840.
Incumbent Democratic Governor Wilson Shannon was defeated by Whig nominee, former U.S. Representative Thomas Corwin.
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Whig | Thomas Corwin | 145,442 | 52.93% | ||
| Democratic | Wilson Shannon (incumbent) | 129,312 | 47.06% | ||
| Scattering | 8 | 0.00% | |||
| Majority | 16,130 | 5.87% | |||
| Turnout | 274,762 | ||||
| Whig gain from Democratic | Swing | ||||