# Opinion polling for the 2023 Spanish local elections (Basque Country)

In the run up to the 2023 Spanish local elections, various organisations carry out opinion polling to gauge voting intention in local entities in Spain. Results of such polls for municipalities and the three foral deputations (General Assemblies) in the Basque Country are displayed in this article. The date range for these opinion polls is from the previous local elections, held on 26 May 2019, to the day the next elections were held, on 28 May 2023.
Polls are listed in reverse chronological order, showing the most recent first and using the dates when the survey fieldwork was done, as opposed to the date of publication. Where the fieldwork dates are unknown, the date of publication is given instead. The highest percentage figure in each polling survey is displayed with its background shaded in the leading party's colour. If a tie ensues, this is applied to the figures with the highest percentages. The "Lead" columns on the right shows the percentage-point difference between the parties with the highest percentages in a given poll.

## Municipalities
### Barakaldo

| Polling firm/Commissioner | Fieldwork date | Sample size | Turnout | PNV | | | | | | | Lead |
| 2023 municipal election | 28 May 2023 | — | 56.0 | 36.0 11 | 24.5 7 | 8.7 2 | 15.9 5 | 7.2 2 | – | 2.9 0 | 11.5 |
| Gizaker/EiTB | 26 Apr–12 May 2023 | 400 | 61.0 | 42.1 12 | 24.9 7 | 10.8 3 | 13.6 4 | 5.2 1 | – | – | 17.2 |
| Gizaker/EiTB | 27 Feb–17 Mar 2023 | 400 | 59.0 | 40.8 12 | 26.2 8 | 9.7 2 | 13.2 4 | 5.4 1 | – | 2.7 0 | 14.6 |
| Gizaker/Inguralde | 12–16 Dec 2022 | 700 | 61.0 | 39.0 11/12 | 26.2 8 | 13.1 3/4 | 12.6 3 | 6.2 1 | 1.1 0 | 0.9 0 | 12.8 |
| 2019 municipal election | 26 May 2019 | — | 62.5 | 38.6 11 | 27.0 8 | 13.2 4 | 11.5 3 | 5.7 1 | 1.5 0 | 1.1 0 | 11.6 |

### Basauri

| Polling firm/Commissioner | Fieldwork date | Sample size | Turnout | PNV | | | | | | Lead |
| 2023 municipal election | 28 May 2023 | — | 55.7 | 39.3 9 | 22.6 5 | 19.6 4 | 8.1 2 | 7.5 1 | – | 16.7 |
| Gizaker/EiTB | 26 Apr–12 May 2023 | 400 | 62.0 | 45.0 10/11 | 21.8 5 | 16.4 3/4 | 8.5 1/2 | 5.0 1 | – | 23.2 |
| Gizaker/EiTB | 27 Feb–17 Mar 2023 | 400 | 63.0 | 45.7 10/11 | 21.5 5 | 15.1 3 | 9.3 2 | 5.0 0/1 | – | 24.2 |
| 2019 municipal election | 26 May 2019 | — | 62.9 | 43.1 10 | 22.7 5 | 13.3 3 | 10.7 2 | 5.4 1 | 0.8 0 | 20.4 |

### Bilbao
#### Color key

Poll conducted after legal ban on opinion polls
| Polling firm/Commissioner | Fieldwork date | Sample size | Turnout | PNV | | | | | | | | Lead |
| 2023 municipal election | 28 May 2023 | — | 56.2 | 36.6 12 | 16.4 5 | 18.9 6 | 8.0 2 | 12.1 4 | 0.2 0 | 3.4 0 | – | 17.7 |
| Sigma Dos/EiTB | 25–28 May 2023 | 700 | ? | 42.4 13/14 | 16.3 5 | 17.5 5 | 9.7 2/3 | 10.2 3 | – | – | – | 24.9 |
| NC Report/La Razón | 22 May 2023 | ? | ? | 42.9 14 | 14.9 5 | 16.2 5 | 7.9 2 | 10.9 3 | – | – | – | 26.7 |
| Gizaker/EiTB | 26 Apr–12 May 2023 | 400 | 60.0 | 45.2 14 | 15.5 5 | 17.3 5 | 7.1 2 | 9.4 3 | – | 2.5 0 | – | 27.9 |
| Ikerfel/El Correo | 25 Apr–12 May 2023 | ? | ? | 43.9 14 | 15.8 5 | 16.8 5 | 10.3 3 | 8.6 2 | – | 1.8 0 | – | 27.1 |
| Ikerfel/GPS | 2–5 May 2023 | ? | 59.5 | 44.3 14 | 15.5 5 | 16.0 5 | 8.0 2 | 8.9 3 | – | 2.9 0 | – | 28.3 |
| CIS | 10–26 Apr 2023 | 601 | ? | 36.4 11/13 | 17.0 5/6 | 19.7 5/7 | 9.9 2/3 | 9.2 2/3 | 0.7 0 | 4.1 0/1 | – | 16.7 |
| NC Report/La Razón | 24 Apr 2023 | ? | 62.8 | 41.1 13 | 15.6 5 | 15.5 5 | 9.5 3 | 11.3 3 | – | – | – | 25.5 |
| ElectoPanel/Crónica Vasca | 19 Sep–4 Apr 2023 | 1,501 | ? | 43.8 14 | 15.3 4 | 15.8 5 | 9.9 3 | 10.3 3 | 1.2 0 | 2.1 0 | - | 28.0 |
| Gizaker/EiTB | 27 Feb–17 Mar 2023 | 400 | 60.0 | 44.0 14 | 14.7 5 | 17.1 5 | 9.9 3 | 7.9 2 | – | 3.2 0 | – | 26.9 |
| Sigma Dos/El Mundo | 3–8 Mar 2023 | 629 | ? | 41.6 13/14 | 16.9 5 | 15.5 5 | 9.7 3 | 9.2 2/3 | – | – | – | 24.7 |
| Ikerfel/GPS | 31 Jan–6 Feb 2023 | ? | 58.5 | 45.7 15 | 15.9 5 | 14.7 5 | 7.9 2 | 8.8 2 | – | 2.2 0 | – | 29.8 |
| Ikerfel/GPS | 3–7 Oct 2022 | ? | 59.0 | 44.3 15 | 15.2 5 | 16.4 5 | 8.5 2 | 8.7 2 | – | 2.0 0 | – | 27.9 |
| ElectoPanel/Crónica Vasca | 10 May–18 Sep 2022 | 1,008 | ? | 40.2 13 | 15.7 5 | 15.5 5 | 11.0 3 | | | 2.0 0 | 12.1 3 | 24.5 |
| Ikerfel/GPS | 6–10 Jun 2022 | 443 | 58.5 | 44.7 14 | 15.9 5 | 15.4 5 | 8.8 2 | 9.0 3 | – | 2.7 0 | – | 28.8 |
| ElectoPanel/Crónica Vasca | 2–19 May 2022 | 757 | ? | 40.8 13 | 15.7 5 | 15.2 5 | 10.7 3 | | | 1.9 0 | 12.3 3 | 25.1 |
| Gizaker/EiTB | 5–12 May 2022 | 400 | ? | 46.7 15 | 15.0 5 | 14.9 4 | 9.5 3 | 8.0 2 | 0.5 0 | 3.0 0 | – | 31.7 |
| Gizaker/City Council of Bilbao | 19–26 May 2021 | 1,000 | 61.0 | 43.0 14 | 15.7 5 | 17.1 5 | 8.8 2 | 9.5 3 | – | 2.7 0 | – | 25.9 |
| 2019 municipal election | 26 May 2019 | — | 61.8 | 42.7 14 | 15.9 5 | 14.9 4 | 10.5 3 | 9.2 3 | 2.2 0 | 1.1 0 | – | 26.8 |

### Donostia-San Sebastián
#### Color key

Poll conducted after legal ban on opinion polls
| Polling firm/Commissioner | Fieldwork date | Sample size | Turnout | PNV | | | | | | | Lead |
| 2023 municipal election | 28 May 2023 | — | 59.9 | 27.9 9 | 26.7 8 | 18.6 5 | 12.1 3 | 8.1 2 | 0.2 0 | 2.4 0 | 1.2 |
| Sigma Dos/EiTB | 25–28 May 2023 | 700 | ? | 33.0 9/10 | 27.5 8/9 | 16.8 5 | 8.8 2 | 9.8 2/3 | – | – | 5.5 |
| Gizaker/EiTB | 26 Apr–12 May 2023 | 400 | 63.0 | 32.9 10 | 25.2 7 | 17.7 5 | 10.4 3 | 9.2 2 | – | 1.5 0 | 7.7 |
| Ikerfel/Diario Vasco | 25 Apr–12 May 2023 | 400 | 60.3 | 32.3 9/10 | 26.4 7/8 | 18.1 5 | 10.6 3 | 9.6 2/3 | – | 1.7 0 | 5.9 |
| Ikerfel/GPS | 2–5 May 2023 | ? | 61.0 | 33.9 10 | 25.2 7 | 16.5 5 | 9.5 3 | 8.4 2 | – | 2.5 0 | 8.7 |
| Gizaker/EiTB | 27 Feb–17 Mar 2023 | 400 | 64.0 | 36.3 11 | 24.1 7 | 17.4 5 | 9.1 2 | 9.7 2 | – | 0.8 0 | 12.2 |
| Ikerfel/GPS | 31 Jan–6 Feb 2023 | ? | 60.5 | 34.3 10 | 24.3 7 | 17.6 5 | 9.7 3 | 8.1 2 | – | 2.2 0 | 10.0 |
| Ikerfel/GPS | 3–7 Oct 2022 | ? | 59.5 | 33.8 10 | 21.7 6 | 21.5 6 | 9.4 3 | 7.9 2 | – | 2.2 0 | 12.1 |
| Ikerfel/GPS | 6–10 Jun 2022 | 400 | 59.0 | 37.1 11 | 22.7 7 | 17.2 5 | 9.2 2 | 7.9 2 | – | 2.1 0 | 14.4 |
| Gizaker/EiTB | 5–12 May 2022 | 400 | ? | 37.3 11 | 24.7 7 | 16.5 5 | 8.6 2 | 8.0 2 | 1.0 0 | 1.8 0 | 12.6 |
| ElectoPanel/Electomanía | 1 Apr–15 Jun 2020 | ? | ? | 30.4 9 | 24.9 7 | 20.1 6 | 12.1 3 | 7.5 2 | – | – | 5.5 |
| 2019 municipal election | 26 May 2019 | — | 65.3 | 35.5 10 | 21.2 6 | 17.5 5 | 10.8 3 | 9.9 3 | 1.6 0 | 1.3 0 | 14.3 |

### Durango

| Polling firm/Commissioner | Fieldwork date | Sample size | Turnout | PNV | | | | | HE | Lead |
| 2023 municipal election | 28 May 2023 | — | 64.1 | 35.4 8 | 37.8 9 | 4.5 0 | 8.2 2 | 6.1 1 | 6.6 1 | 2.4 |
| Aztiker/City Council of Durango | 16–27 Jan 2023 | 614 | 64.6 | 36.7 8/9 | 33.0 7/8 | 12.1 2/3 | 9.4 2 | 5.0 0/1 | – | 3.7 |
| 2019 municipal election | 26 May 2019 | — | 68.2 | 35.3 8 | 32.3 7 | 16.3 4 | 10.0 2 | 4.5 0 | – | 3.0 |

### Eibar

| Polling firm/Commissioner | Fieldwork date | Sample size | Turnout | | PNV | | | | Lead |
| 2023 municipal election | 28 May 2023 | — | 60.3 | 36.4 8 | 25.7 6 | 26.8 6 | 5.4 1 | 3.9 0 | 9.6 |
| Gizaker/EiTB | 26 Apr–12 May 2023 | 400 | 63.0 | 35.9 8 | 28.6 6/7 | 27.3 6/7 | 4.1 0 | 3.5 0 | 7.3 |
| Gizaker/EiTB | 27 Feb–17 Mar 2023 | 400 | 65.0 | 35.3 8 | 28.7 6/7 | 24.9 5/6 | 6.2 1 | 4.0 0 | 6.6 |
| 2019 municipal election | 26 May 2019 | — | 67.5 | 39.2 9 | 25.9 6 | 24.0 5 | 6.6 1 | 3.5 0 | 13.3 |

### Getxo

| Polling firm/Commissioner | Fieldwork date | Sample size | Turnout | PNV | | | | | | | Lead |
| 2023 municipal election | 28 May 2023 | — | 62.3 | 31.7 9 | 21.7 6 | 20.2 6 | 10.3 3 | 5.6 1 | – | 3.4 0 | 10.0 |
| Gizaker/EiTB | 26 Apr–12 May 2023 | 400 | 62.0 | 40.2 11/12 | 15.8 4 | 20.1 5/6 | 9.2 2 | 7.4 2 | – | 2.7 0 | 20.1 |
| Gizaker/EiTB | 27 Feb–17 Mar 2023 | 400 | 65.0 | 38.6 11 | 14.1 4 | 18.2 5 | 10.9 3 | 7.7 2 | – | 4.2 0 | 20.4 |
| 2019 municipal election | 26 May 2019 | — | 67.5 | 39.1 11 | 16.4 5 | 15.1 4 | 10.6 3 | 8.0 2 | 3.2 0 | 1.6 0 | 22.7 |

### Irun

| Polling firm/Commissioner | Fieldwork date | Sample size | Turnout | | PNV | | | | | | Lead |
| 2023 municipal election | 28 May 2023 | — | 54.1 | 32.7 10 | 23.0 7 | 9.2 2 | 16.1 4 | 8.5 2 | – | 4.1 0 | 9.7 |
| Gizaker/EiTB | 26 Apr–12 May 2023 | 400 | 61.0 | 32.7 8/9 | 26.6 7/8 | 13.3 3/4 | 19.3 5 | 6.3 1 | – | – | 6.1 |
| Ikerfel/Diario Vasco | 25 Apr–12 May 2023 | 400 | 59.0 | 32.4 9 | 26.1 7 | 14.7 4 | 16.1 4 | 6.3 1 | – | 2.6 0 | 6.3 |
| Gizaker/EiTB | 27 Feb–17 Mar 2023 | 400 | 60.0 | 31.9 8/9 | 28.3 7/8 | 12.0 3 | 18.6 5 | 6.7 1 | – | 1.7 0 | 3.6 |
| 2019 municipal election | 26 May 2019 | — | 60.8 | 35.7 10 | 24.8 7 | 15.4 4 | 13.8 3 | 5.5 1 | 2.3 0 | 1.6 0 | 10.9 |

### Llodio

| Polling firm/Commissioner | Fieldwork date | Sample size | Turnout | PNV | | Omnia | | | | | Lead |
| 2023 municipal election | 28 May 2023 | — | 63.5 | 33.8 6 | 34.1 7 | 15.1 3 | 9.6 1 | – | 4.2 0 | 1.6 0 | 0.3 |
| Gizaker/EiTB | 26 Apr–12 May 2023 | 400 | 64.0 | 33.9 7 | 31.3 6 | 16.5 3 | 9.3 1 | 4.7 0 | 3.4 0 | – | 2.6 |
| Gizaker/EiTB | 27 Feb–17 Mar 2023 | 400 | 66.0 | 33.2 6/7 | 27.8 5/6 | 18.4 3 | 10.1 2 | 3.9 0 | 4.5 0 | – | 5.4 |
| 2019 municipal election | 26 May 2019 | — | 67.8 | 36.2 7 | 24.7 5 | 18.2 3 | 10.4 2 | 4.7 0 | 4.4 0 | 0.7 0 | 11.5 |

### Salvatierra-Agurain

| Polling firm/Commissioner | Fieldwork date | Sample size | Turnout | PNV | | | | | | Lead |
| 2023 municipal election | 28 May 2023 | — | 66.2 | 46.2 6 | 48.6 7 | 3.1 0 | 0.9 0 | – | – | 2.4 |
| Gizaker/EiTB | 26 Apr–12 May 2023 | 200 | 68.0 | 42.9 6 | 46.7 7 | 5.2 0 | 3.0 0 | – | – | 3.8 |
| Gizaker/EiTB | 27 Feb–17 Mar 2023 | 200 | 69.0 | 45.5 6/7 | 45.8 6/7 | 3.6 0 | 2.6 0 | 1.1 0 | 1.4 0 | 0.3 |
| 2019 municipal election | 26 May 2019 | — | 67.5 | 45.6 7 | 44.9 6 | 4.4 0 | 3.2 0 | 1.0 0 | – | 0.7 |

### Tolosa

| Polling firm/Commissioner | Fieldwork date | Sample size | Turnout | PNV | | | | | Lead |
| 2023 municipal election | 28 May 2023 | — | 63.3 | 36.6 7 | 49.2 9 | 7.5 1 | 3.1 0 | 1.9 0 | 12.6 |
| Gizaker/EiTB | 26 Apr–12 May 2023 | 400 | 64.0 | 39.5 7 | 48.6 9 | 6.1 1 | 3.9 0 | 1.2 0 | 9.1 |
| Gizaker/EiTB | 27 Feb–17 Mar 2023 | 400 | 70.0 | 41.3 8 | 42.7 8 | 8.2 1 | 4.7 0 | 1.8 0 | 1.4 |
| 2019 municipal election | 26 May 2019 | — | 68.8 | 43.4 8 | 41.3 8 | 7.2 1 | 5.2 0 | 2.1 0 | 2.1 |

### Vitoria-Gasteiz
#### Color key

Poll conducted after legal ban on opinion polls
| Polling firm/Commissioner | Fieldwork date | Sample size | Turnout | PNV | | | | | | | Lead |
| 2023 municipal election | 28 May 2023 | — | 58.1 | 19.7 6 | 21.9 6 | 22.8 7 | 20.1 6 | 7.1 2 | 0.2 0 | 3.8 0 | 0.9 |
| Sigma Dos/EiTB | 25–28 May 2023 | 700 | ? | 23.7 7 | 22.2 6/7 | 24.4 7 | 19.4 5/6 | 6.7 1/2 | – | – | 0.7 |
| Gizaker/EiTB | 26 Apr–12 May 2023 | 400 | 61.0 | 25.2 7/8 | 19.4 5/6 | 23.9 7 | 19.1 5/6 | 7.8 2 | – | 2.1 0 | 1.3 |
| Ikerfel/El Correo | 25 Apr–12 May 2023 | ? | ? | 22.5 6/7 | 22.2 6 | 20.3 6 | 19.5 5/6 | 10.8 3 | – | 2.3 0 | 0.3 |
| Ikerfel/GPS | 2–5 May 2023 | ? | 60.0 | 23.8 7 | 21.2 6 | 22.7 7 | 18.5 5 | 7.3 2 | – | 3.2 0 | 1.1 |
| Gizaker/City Council of Vitoria | 23–24 Mar 2023 | 1,150 | ? | ? 7/8 | ? 5/6 | ? 6/7 | ? 5 | ? 2/3 | – | – | ? |
| Gizaker/EiTB | 27 Feb–17 Mar 2023 | 400 | 61.0 | 25.6 7/8 | 19.2 5/6 | 22.3 6/7 | 18.3 5 | 10.0 2/3 | – | 2.8 0 | 3.3 |
| PP | 14 Mar 2023 | ? | ? | ? 6 | ? 5/6 | ? 6/7 | ? 7 | ? 1/2 | – | – | ? |
| Ikerfel/GPS | 31 Jan–6 Feb 2023 | ? | 60.0 | 24.3 7 | 20.9 6 | 21.6 7 | 18.1 5 | 6.8 2 | – | 4.0 0 | 2.7 |
| ElectoPanel/Crónica Vasca | 8 Dec–4 Feb 2023 | 1,647 | ? | 25.8 8 | 22.5 6 | 23.6 7 | 17.0 5 | 6.1 1 | 0.8 0 | 3.8 0 | 2.2 |
| Gizaker/Grupo Noticias | 13–16 Dec 2022 | 800 | ? | 26.6 8 | 19.4 5 | 22.5 7 | ? 5 | ? 2 | ? 0 | ? 0 | 4.1 |
| ElectoPanel/Crónica Vasca | 16 Jul–7 Dec 2022 | 1,257 | ? | 25.6 7 | 22.8 7 | 23.4 7 | 16.9 5 | 6.1 1 | 1.0 0 | 4.1 0 | 2.2 |
| Ikerfel/GPS | 3–7 Oct 2022 | ? | 60.0 | 24.2 7 | 21.5 7 | 21.3 6 | 18.2 5 | 7.1 2 | – | 3.4 0 | 2.7 |
| ElectoPanel/Crónica Vasca | 2–15 Jun 2022 | 770 | ? | 25.5 7 | 22.3 7 | 22.8 6 | ? 5 | 6.8 2 | 1.0 0 | 3.9 0 | 2.7 |
| Ikerfel/GPS | 6–10 Jun 2022 | 601 | 59.5 | 24.3 7 | 20.4 6 | 22.0 7 | 18.0 5 | 7.3 2 | – | 4.6 0 | 2.3 |
| Gizaker/EiTB | 5–12 May 2022 | 400 | ? | 24.5 7 | 21.0 6 | 22.6 7 | 17.7 5 | 8.0 2 | 1.3 0 | 3.9 0 | 1.9 |
| ElectoPanel/Electomanía | 13 May-8 Oct 2021 | 361 | ? | 24.9 7 | 22.0 6 | 22.1 7 | 16.4 5 | 7.7 2 | 1.1 0 | 3.6 0 | 2.8 |
| Gizaker/City Council of Vitoria | 7-11 Jun 2021 | 1,150 | ? | ? 8 | ? 6 | ? 7 | ? 4 | ? 2 | – | – | ? |
| 2019 municipal election | 26 May 2019 | — | 63.3 | 23.6 7 | 21.4 6 | 20.1 6 | 18.5 5 | 9.9 3 | 2.5 0 | 1.4 0 | 3.1 |

## General Assemblies
### Álava

| Polling firm/Commissioner | Fieldwork date | Sample size | Turnout | PNV | | | | | | | | Lead |
| 2023 foral election | 28 May 2023 | — | 59.6 | 25.9 15 | 25.1 14 | 18.4 9 | 17.0 9 | 7.0 3 | – | 3.0 1 | – | 0.8 |
| Gizaker/EiTB | 26 Apr–12 May 2023 | 1,543 | 61.9 | 30.8 17/18 | 24.4 13 | 16.6 9 | 15.4 8 | 8.8 3/4 | – | 1.7 0 | – | 6.4 |
| Ikerfel/El Correo | 25 Apr–12 May 2023 | 2,850 | 68.3 | 31.1 16/18 | 21.0 11/13 | 19.1 10/11 | 15.3 8 | 9.2 3/4 | – | 2.7 0/1 | – | 10.1 |
| Ikerfel/GPS | 2–5 May 2023 | 728 | 60.5 | 31.0 | 22.2 | 18.2 | 15.4 | 7.1 | – | 3.0 | – | 8.8 |
| Aztiker/Gara | 11–25 Apr 2023 | 500 | ? | 28.5 16 | 22.5 12 | 18.1 10 | 14.4 8 | 7.8 3 | – | 5.1 2 | – | 6.0 |
| Gizaker/EiTB | 27 Feb–17 Mar 2023 | 1,543 | 62.5 | 31.7 18/19 | 23.6 13 | 18.0 9/10 | 13.8 7/8 | 8.6 3 | – | 2.4 0/1 | – | 8.1 |
| Ikerfel/Álava Deputation | 26 Feb–15 Mar 2023 | 1,200 | 57.7 | 31.3 18/19 | 24.2 13/14 | 17.2 8/9 | 13.9 7/8 | 7.4 2/3 | – | 2.9 0/1 | – | 7.1 |
| Aztiker/Gara | 14–25 Feb 2023 | 500 | ? | 28.8 16 | 22.2 12 | 18.1 10 | 14.2 8 | 7.5 3 | – | 5.1 2 | – | 6.6 |
| Ikerfel/GPS | 31 Jan–6 Feb 2023 | 728 | 58.5 | 31.5 | 22.8 | 18.0 | 15.0 | 6.6 | – | 3.1 | – | 8.7 |
| Ikerfel/GPS | 13–20 Oct 2022 | 1,204 | 55.2 | 31.5 18 | 23.1 12/13 | 18.0 8/10 | 15.1 7/8 | 7.8 3 | – | 2.4 0/1 | – | 8.4 |
| Ikerfel/GPS | 3–7 Oct 2022 | 800 | 59.5 | 30.5 | 23.2 | 18.8 | 14.0 | 6.7 | – | 3.0 | – | 7.3 |
| Ikerfel/GPS | 6–10 Jun 2022 | 800 | 58.5 | 31.6 | 23.3 | 17.0 | 14.0 | 6.8 | – | 3.4 | – | 8.3 |
| Gizaker/EiTB | 5–12 May 2022 | 550 | ? | 32.0 | 23.0 | 18.1 | 14.2 | 7.3 | 0.6 | 2.8 | – | 9.0 |
| 2020 regional election | 12 Jul 2020 | — | 49.0 | 31.9 | 24.6 | 15.5 | | 8.0 | | 3.8 | 11.4 | 7.3 |
| November 2019 general election | 10 Nov 2019 | — | 66.6 | 23.6 | 16.1 | 21.9 | 14.9 | 16.5 | 1.5 | 3.8 | – | 2.7 |
| 2019 foral election | 26 May 2019 | — | 65.3 | 29.4 17 | 21.0 12 | 18.9 10 | 15.0 8 | 9.9 4 | 2.3 0 | 1.4 0 | – | 8.4 |

### Biscay

| Polling firm/Commissioner | Fieldwork date | Sample size | Turnout | PNV | | | | | | | | Lead |
| 2023 foral election | 28 May 2023 | — | 60.1 | 38.4 23 | 25.0 15 | 15.9 8 | 7.3 2 | 8.2 3 | – | 2.0 0 | – | 13.4 |
| Gizaker/EiTB | 26 Apr–12 May 2023 | 2,483 | 61.8 | 44.3 25/26 | 21.8 11/12 | 15.9 8 | 8.4 4 | 6.7 2 | – | 1.8 0 | – | 22.5 |
| Ikerfel/El Correo | 25 Apr–12 May 2023 | 2,850 | 63.9 | 43.4 25/26 | 21.1 10/12 | 17.1 8/9 | 8.9 4 | 7.0 1/3 | – | 1.1 0 | – | 22.3 |
| Ikerfel/GPS | 2–5 May 2023 | 1,318 | 62.5 | 44.2 | 22.0 | 15.4 | 7.0 | 6.8 | – | 1.7 | – | 22.2 |
| Gizaker/Biscay Deputation | 17–25 Apr 2023 | 3,000 | 65.1 | 43.4 25/26 | 22.1 12/13 | 15.3 8 | 9.8 4 | 6.2 1 | – | 2.0 0 | – | 21.3 |
| Aztiker/Gara | 11–25 Apr 2023 | 500 | ? | 42.4 25 | 21.5 12 | 16.1 9 | 8.4 3 | 6.5 2 | – | 2.6 0 | – | 20.9 |
| Gizaker/EiTB | 27 Feb–17 Mar 2023 | 2,483 | 66.7 | 45.4 26 | 22.6 12 | 15.3 8 | 8.4 4 | 5.2 1 | – | 1.9 0 | – | 22.8 |
| Aztiker/Gara | 14–25 Feb 2023 | 500 | ? | 42.9 26 | 21.3 11 | 16.1 9 | 8.1 4 | 6.4 1 | – | 2.5 0 | – | 21.6 |
| Ikerfel/GPS | 31 Jan–6 Feb 2023 | 1,318 | 59.5 | 44.6 | 22.2 | 15.7 | 7.3 | 7.2 | – | 1.4 | – | 22.4 |
| Ikerfel/GPS | 3–7 Oct 2022 | 1,449 | 60.5 | 44.4 | 22.4 | 14.4 | 8.2 | 7.1 | – | 1.2 | – | 22.0 |
| Gizaker/Biscay Deputation | 8–22 Jun 2022 | 3,000 | 64.7 | 44.5 25/26 | 21.5 12 | 15.3 8 | 8.9 3/4 | 6.5 2 | 1.0 0 | 1.5 0 | – | 23.0 |
| Ikerfel/GPS | 6–10 Jun 2022 | 1,449 | 59.5 | 44.6 | 22.3 | 14.7 | 7.8 | 7.3 | – | 1.7 | – | 22.3 |
| Gizaker/EiTB | 5–12 May 2022 | 600 | ? | 45.7 | 22.2 | 15.1 | 7.6 | 6.6 | 0.8 | 1.5 | – | 23.5 |
| Ikerfel/Biscay Deputation | 8–29 Dec 2021 | 2,503 | 55.4 | 44.6 25/26 | 21.9 12/13 | 14.8 8 | 8.3 4 | 6.6 1 | 0.8 0 | 1.9 0 | – | 22.7 |
| Gizaker/Biscay Deputation | 16–30 Jun 2021 | 3,000 | 60.7 | 45.5 26 | 21.0 11 | 15.0 8 | 9.1 4 | 6.4 2 | 1.1 0 | 1.0 0 | – | 24.5 |
| 2020 regional election | 12 Jul 2020 | — | 50.4 | 42.2 | 23.7 | 13.5 | 8.5 | | | 1.9 | 6.8 | 18.5 |
| November 2019 general election | 10 Nov 2019 | — | 66.8 | 35.2 | 15.0 | 19.1 | 15.4 | 8.8 | 1.1 | 2.4 | – | 16.1 |
| 2019 foral election | 26 May 2019 | — | 65.7 | 43.1 25 | 19.7 10 | 16.5 8 | 10.5 6 | 6.6 2 | 1.2 0 | 0.9 0 | – | 23.4 |

### Gipuzkoa

| Polling firm/Commissioner | Fieldwork date | Sample size | Turnout | PNV | | | | | | | | Lead |
| 2023 foral election | 28 May 2023 | — | 59.9 | 32.0 17 | 36.6 22 | 15.6 7 | 6.5 2 | 6.3 3 | – | – | – | 4.6 |
| Gizaker/EiTB | 26 Apr–12 May 2023 | 2,623 | 64.0 | 36.9 21/22 | 35.3 19/20 | 14.9 7 | 7.0 2 | 4.4 1 | – | 1.2 0 | – | 1.6 |
| Ikerfel/El Correo | 25 Apr–12 May 2023 | 2,850 | 65.2 | 35.2 19/21 | 33.5 18/19 | 17.1 8/9 | 8.9 2/4 | 4.9 1 | – | – | – | 1.7 |
| Ikerfel/GPS | 2–5 May 2023 | 984 | 63.0 | 35.9 | 33.1 | 16.4 | 7.1 | 4.9 | – | – | – | 0.5 |
| Aztiker/Gara | 11–25 Apr 2023 | 500 | ? | 34.4 20 | 33.9 19 | 16.4 9 | 7.0 2 | 4.5 1 | – | 1.9 0 | – | 0.5 |
| Gizaker/Gipuzkoa Deputation | 27–31 Mar 2023 | 1,200 | 65.1 | 36.2 20/22 | 34.0 19 | 15.9 7/8 | 7.3 2/3 | 4.6 1 | – | 1.1 0 | – | 2.2 |
| Gizaker/EiTB | 27 Feb–17 Mar 2023 | 2,623 | 67.2 | 37.1 21 | 33.1 18 | 15.9 9 | 7.8 2 | 4.2 1 | – | 1.4 0 | – | 4.0 |
| Aztiker/Gara | 14–25 Feb 2023 | 500 | ? | 34.9 20 | 33.6 19 | 16.5 9 | 6.8 2 | 4.5 1 | – | 1.8 0 | – | 1.3 |
| Ikerfel/GPS | 31 Jan–6 Feb 2023 | 984 | 59.0 | 36.2 | 32.7 | 16.0 | 7.1 | 4.8 | – | 1.3 | – | 3.5 |
| Gizaker/Gipuzkoa Deputation | 1–12 Dec 2022 | 1,200 | 64.9 | 36.7 21 | 34.0 19 | 16.0 8 | 7.3 2 | 3.9 1 | – | 1.2 0 | – | 2.7 |
| Ikerfel/GPS | 3–7 Oct 2022 | 1,084 | 59.5 | 36.3 | 33.0 | 16.6 | 7.0 | 4.4 | – | 1.0 | – | 3.3 |
| Ikerfel/GPS | 6–10 Jun 2022 | 1,084 | 60.0 | 36.4 | 33.5 | 15.9 | 7.0 | 4.7 | – | 1.1 | – | 2.9 |
| Gizaker/Gipuzkoa Deputation | 16–24 May 2022 | 1,200 | 64.1 | 37.0 21 | 33.2 19 | 15.5 7 | 8.3 3 | 4.0 1 | – | 1.0 0 | – | 3.8 |
| Gizaker/EiTB | 5–12 May 2022 | 600 | ? | 36.3 | 33.8 | 16.7 | 7.4 | 4.6 | 0.8 | 0.1 | – | 2.5 |
| Gizaker/Gipuzkoa Deputation | 19–24 Nov 2021 | 1,200 | 63.9 | 36.9 21 | 34.5 19 | 15.2 8 | 8.0 2 | 4.8 1 | – | 1.0 0 | – | 2.4 |
| Gizaker/Gipuzkoa Deputation | 26–29 Apr 2021 | 1,200 | 63.2 | 37.5 21 | 33.2 19 | 16.3 8 | 7.7 2 | 4.1 1 | – | 0.9 0 | – | 4.3 |
| Gizaker/Gipuzkoa Deputation | 24 Nov–1 Dec 2020 | 1,200 | ? | 36.9 21 | 33.5 19 | 15.0 7 | 8.6 3 | 3.8 1 | 0.8 0 | – | – | 3.4 |
| 2020 regional election | 12 Jul 2020 | — | 52.2 | 36.1 | 34.9 | 12.8 | 7.1 | | | 1.3 | 4.6 | 1.2 |
| Gizaker/Gipuzkoa Deputation | 11–20 May 2020 | 850 | 63.0 | 34.2 | 31.4 | 18.5 | 8.8 | 5.5 | 0.5 | – | – | 2.8 |
| November 2019 general election | 10 Nov 2019 | — | 65.8 | 30.5 | 25.8 | 18.1 | 15.0 | 6.2 | 1.9 | 1.0 | – | 4.7 |
| 2019 foral election | 26 May 2019 | — | 66.7 | 35.6 20 | 31.6 17 | 17.1 9 | 8.9 4 | 4.7 1 | 1.0 0 | – | – | 4.0 |