The returns
1866 governor races

No President race in 1866.
Table of returns — 16 states
| California | Popular Democratic (Popular Democratic) | 42.8% |
|---|---|---|
| Iowa | National (National) | 3.0% |
| Kiowah | Popular Democratic (Popular Democratic) | 14.4% |
| Maine | Popular Democratic (Popular Democratic) | 1.5% |
| Marshall | National (National) | 12.2% |
| Massachusetts | Popular Democratic (Popular Democratic) | 4.7% |
| Michigan | National (National) | 2.0% |
| Missouri | National (National) | 76.2% |
| New Hampshire | Popular Democratic (Popular Democratic) | 8.7% |
| New Jersey | Popular Democratic (Popular Democratic) | 1.9% |
| New Mexico | National (National) | 10.9% |
| Oregon | National (National) | 7.4% |
| Pennsylvania | National (National) | 2.4% |
| Rhode Island | Popular Democratic (Popular Democratic) | 27.9% |
| Rio Grande | Popular Democratic (Popular Democratic) | 3.5% |
| Sonora | Popular Democratic (Popular Democratic) | 18.6% |