| ← 1955 1956 1957 1958 1959 → Off-year elections | |
| Election day | November 5 |
|---|---|
| Senate elections | |
| Overall control | Democratic hold |
| Seats contested | 2 of 96 seats (2 special elections) |
| Net seat change | 1 [1] |
| House elections | |
| Overall control | Democratic hold |
| Seats contested | 5 special elections |
| Net seat change | 0 |
Elections in 1957 included: