1858 Senate Elections
Table of returns — 37 states
| State | Winner | Margin |
|---|---|---|
| South Carolina | National (National) | 100.0% |
| Georgia | National (National) | 100.0% |
| Alabama | National (National) | 98.8% |
| Mississippi | National (National) | 100.0% |
| Orleans | National (National) | 94.1% |
| North Carolina | National (National) | 100.0% |
| Arkansas | National (National) | 95.0% |
| Tennessee | National (National) | 100.0% |
| Texas | National (National) | 100.0% |
| Virginia | National (National) | 57.4% |
| Kentucky | National (National) | 89.0% |
| Maryland | National (National) | 87.7% |
| Delaware | National (National) | 87.2% |
| Pennsylvania | Popular Democratic (Popular Democratic) | 23.3% |
| New Jersey | Popular Democratic (Popular Democratic) | 4.6% |
| Ohio | Popular Democratic (Popular Democratic) | 31.5% |
| New York | Popular Democratic (Popular Democratic) | 68.3% |
| Connecticut | National (National) | 18.1% |
| Massachusetts | Popular Democratic (Popular Democratic) | 8.6% |
| Rhode Island | Popular Democratic (Popular Democratic) | 4.2% |
| New Hampshire | Popular Democratic (Popular Democratic) | 4.9% |
| Vermont | Popular Democratic (Popular Democratic) | 19.3% |
| Maine | Popular Democratic (Popular Democratic) | 29.9% |
| Miami | Popular Democratic (Popular Democratic) | 23.8% |
| Illinois | Popular Democratic (Popular Democratic) | 32.2% |
| Michigan | Popular Democratic (Popular Democratic) | 23.2% |
| Iowa | Popular Democratic (Popular Democratic) | 50.4% |
| Missouri | National (National) | 86.1% |
| Wisconsin | Popular Democratic (Popular Democratic) | 52.6% |
| Minnesota | Popular Democratic (Popular Democratic) | 52.2% |
| Marshall | Popular Democratic (Popular Democratic) | 9.3% |
| Austin | National (National) | 100.0% |
| Rio Grande | National (National) | 4.5% |
| Chihuahua | Popular Democratic (Popular Democratic) | 9.2% |
| Sonora | Popular Democratic (Popular Democratic) | 0.7% |
| New Mexico | Popular Democratic (Popular Democratic) | 29.4% |
| California | Popular Democratic (Popular Democratic) | 59.0% |