| # | Years | Size | Links | |
|---|---|---|---|---|
| UNKNOWN | 1977–2016 | 2.6% | ||
| Amaiur | 2011–2011 | 2.0% | ||
| CC | 1986–2016 | 1.1% | ||
| CDS | 1982–1989 | 5.4% | ||
| CIU | 1977–2016 | 5.1% | ||
| CPV | 2011–2016 | 1.1% | ||
| Cs | 2015–2016 | 11.4% | ||
| ERC | 1977–2016 | 2.6% | ||
| HB | 1979–1996 | 1.4% | ||
| IU | 1977–2015 | 6.6% | ||
| PDP | 1986–1986 | 6.0% | ||
| PNV | 1977–2016 | 2.3% | ||
| PP | 1977–2016 | 52.9% | ||
| Ps | 2015–2016 | 19.1% | ||
| PSA | 1979–1979 | 1.4% | ||
| PSOE | 1977–2016 | 57.7% | ||
| PSP | 1977–1977 | 1.7% | ||
| UCD | 1977–1982 | 48.0% | ||
| UPyD | 2008–2011 | 1.4% |