The returns
1866 House Elections

No President race in 1866.
Table of returns — 31 states
| California | Popular Democratic 4 · National 1 |
|---|---|
| Chihuahua | National 1 · Popular Democratic 1 |
| Connecticut | National 4 · Popular Democratic 2 |
| Delaware | National 1 |
| Illinois | Popular Democratic 12 · National 7 |
| Iowa | Popular Democratic 5 · National 3 |
| Kentucky | National 11 · Popular Democratic 2 |
| Kiowah | Popular Democratic 1 |
| Maine | Popular Democratic 5 · National 3 |
| Marshall | National 2 · Popular Democratic 1 |
| Maryland | National 7 · Popular Democratic 1 |
| Massachusetts | Popular Democratic 15 · National 9 |
| Miami | National 8 · Popular Democratic 7 |
| Michigan | Popular Democratic 5 · National 3 |
| Minnesota | National 1 · Popular Democratic 1 |
| Missouri | National 9 · Popular Democratic 2 |
| New Hampshire | National 2 · Popular Democratic 2 |
| New Jersey | National 6 · Popular Democratic 3 |
| New Mexico | Popular Democratic 1 |
| New York | Popular Democratic 44 · National 10 |
| Ohio | Popular Democratic 15 · National 9 |
| Oregon | National 1 |
| Pennsylvania | Popular Democratic 21 · National 18 |
| Rhode Island | National 1 · Popular Democratic 1 |
| Rio Grande | National 1 · Popular Democratic 1 |
| Sonora | National 1 · Popular Democratic 1 |
| Vermont | Popular Democratic 3 · National 1 |
| Virginia | Popular Democratic 7 · National 6 |
| Washoe | Popular Democratic 1 |
| Wisconsin | Popular Democratic 6 · National 3 |
| Yucatan | Popular Democratic 2 |