1864 Senate Elections
Table of returns — 30 states
| State | Winner | Margin |
|---|---|---|
| Yucatan | Popular Democratic (Popular Democratic) | 53.3% |
| Virginia | Popular Democratic (Popular Democratic) | 10.8% |
| Kentucky | National (National) | 49.5% |
| Maryland | National (National) | 54.7% |
| Delaware | National (National) | 38.2% |
| Pennsylvania | Popular Democratic (Popular Democratic) | 18.3% |
| New Jersey | National (National) | 2.7% |
| Ohio | Popular Democratic (Popular Democratic) | 19.5% |
| New York | Popular Democratic (Popular Democratic) | 48.8% |
| Connecticut | Popular Democratic (Popular Democratic) | 2.2% |
| Massachusetts | Popular Democratic (Popular Democratic) | 19.5% |
| Rhode Island | Popular Democratic (Popular Democratic) | 24.0% |
| New Hampshire | Popular Democratic (Popular Democratic) | 15.0% |
| Vermont | Popular Democratic (Popular Democratic) | 32.7% |
| Maine | Popular Democratic (Popular Democratic) | 26.0% |
| Miami | Popular Democratic (Popular Democratic) | 26.0% |
| Illinois | Popular Democratic (Popular Democratic) | 28.0% |
| Michigan | Popular Democratic (Popular Democratic) | 26.8% |
| Iowa | Popular Democratic (Popular Democratic) | 26.4% |
| Missouri | National (National) | 34.6% |
| Wisconsin | Popular Democratic (Popular Democratic) | 29.5% |
| Minnesota | Popular Democratic (Popular Democratic) | 32.4% |
| Marshall | Popular Democratic (Popular Democratic) | 11.7% |
| Rio Grande | Popular Democratic (Popular Democratic) | 24.4% |
| Chihuahua | Popular Democratic (Popular Democratic) | 21.2% |
| Sonora | Popular Democratic (Popular Democratic) | 11.7% |
| New Mexico | Popular Democratic (Popular Democratic) | 13.2% |
| California | Popular Democratic (Popular Democratic) | 57.9% |
| Kiowah | Popular Democratic (Popular Democratic) | 34.6% |
| Oregon | Popular Democratic (Popular Democratic) | 18.9% |