| # | Years | Size | Links | |
|---|---|---|---|---|
| Amaiur | 2011–2011 | 1.2% | ||
| AP PDP | 1982–1986 | 12.9% | ||
| BNG | 1986–2020 | 1.1% | ||
| CDC | 2015–2020 | 1.4% | ||
| CDS | 1982–1993 | 6.6% | ||
| CiU | 1982–2011 | 3.5% | ||
| EAJPNV | 1982–2020 | 1.3% | ||
| EH Bildu | 2015–2020 | 1.3% | ||
| ERC | 1982–2020 | 3.1% | ||
| EU | 1982–1986 | 2.1% | ||
| IU | 1986–2015 | 8.8% | ||
| PCE | 1982–1982 | 2.3% | ||
| Podemos | 2015–2020 | 16.0% | ||
| PP | 1989–2020 | 33.7% | ||
| PSA | 1982–1982 | 1.7% | ||
| PSOE | 1982–2020 | 39.3% | ||
| UCD | 1982–1986 | 2.6% | ||
| UPyD | 2008–2015 | 2.6% | ||
| VOX | 2016–2020 | 7.5% | ||
| Cs | 2015–2020 | 9.9% |