Opinion polling for the 2027 Spanish local elections (Basque Country)

For opinion polls in other autonomous communities, see Opinion polling for the 2027 Spanish local elections.

In the run up to the 2027 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 28 May 2023, to the day the next elections will be held, on 23 May 2027.

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

Bilbao

Polling firm/Commissioner	Fieldwork date	Sample size	Turnout	PNV							Lead
Gizaker/City Council of Bilbao [1]	26 Jun–2 Jul 2025	800	55.0	37.4 12	21.9 7	14.9 4/5	10.9 3	6.0 1/2	5.2 1	1.4 0	15.5
2023 municipal election	28 May 2023	—	56.2	36.6 12	18.9 6	16.4 5	12.1 4	8.0 2	3.4 0	–	17.7

Getxo

Polling firm/Commissioner	Fieldwork date	Sample size	Turnout	PNV						Lead
Gizaker/City Council of Getxo [2]	19–27 Jun 2025	900	61.0	31.1 9	21.9 6	23.5 7	9.7 3	4.7 0	3.3 0	7.6
Ikerfel/City Council of Getxo [3]	Sep 2023	700	?	? 9	? 6	? 6	? 3	? 1	–	?
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

General Assemblies

Biscay

Polling firm/Commissioner	Fieldwork date	Sample size	Turnout	PNV							Lead
Ikerfel/Biscay Deputation [4]	11 Jun–7 Jul 2025	3,000	60.2	40.7 24	28.9 16/17	14.1 7	7.9 3/4	1.9 0	2.6 0	2.3 0	11.8
Ikerfel/Biscay Deputation [5]	18 Jun–6 Jul 2024	3,063	60.9	41.0 23/25	28.3 15/17	13.8 7/8	8.2 3/4	3.4 0	1.9 0	2.0 0	12.7
2024 EP election	9 Jun 2024	—	49.5	25.5	22.7	26.5	11.7	3.2	2.7	3.3	1.0
2024 regional election	21 Apr 2024	—	60.8	39.1	28.3	13.9	9.0	2.2	1.9	3.3	10.8
2023 general election	23 Jul 2023	—	65.2	26.9	20.6	25.8	11.6	[a]	2.6	10.9	1.1
2023 foral election	28 May 2023	—	60.1	38.4 23	25.0 15	15.9 8	8.2 3	7.3 2	2.0 0	–	13.4

Gipuzkoa

Polling firm/Commissioner	Fieldwork date	Sample size	Turnout		PNV					Lead
Gizaker/Gipuzkoa Deputation [6]	22–28 May 2025	1,500	59.7	40.0 23	31.9 17	15.1 7	4.8 1	6.0 3	–	8.1
Gizaker/Gipuzkoa Deputation [7]	5–12 Dec 2024	1,500	58.6	39.4 22	33.0 18	14.6 7	4.8 1	6.2 3	–	6.4
2024 EP election	9 Jun 2024	—	47.9	34.4	20.6	24.0	3.0	8.7	3.0	10.4
2024 regional election	21 Apr 2024	—	59.0	39.8	31.4	13.4	2.2	6.4	3.1	8.4
2023 general election	23 Jul 2023	—	64.5	31.2	22.6	23.3	[a]	8.7	10.6	7.9
2023 foral election	28 May 2023	—	60.1	36.6 23	32.0 15	15.7 8	6.5 3	6.3 2	–	4.6

Notes

1. Within Sumar.

References

1. "[M] BILBAO. Encuesta Gizaker 29/07/2025: EAJ-PNV 37,4% (12), EH BILDU 21,9% (7), PSE-EE 14,9% (4/5), PP 10,9% (3), PODEMOS-AV 6,0% (1/2), VOX 5,2% (1), SUMAR 1,4%". Electográfica (in Spanish). 29 July 2025.
2. "Estudio de necesidades, demandas, satisfacción y percepción ciudadana" (PDF). City Council of Getxo (in Spanish). 13 August 2025.
3. "El 83% de las personas residentes en Getxo está satisfecho de forma notable o sobresaliente con la calidad de vida del municipio". City Council of Getxo (in Spanish). 27 October 2023.
4. "Estudio sociológico de Bizkaia. Prospección electoral. Julio 2025" (PDF). Ikerfel (in Spanish). 28 July 2025.
5. "Estudio sociológico de Bizkaia. Julio 2024" (PDF). Ikerfel (in Spanish). 2 August 2024.
6. "Sociómetro Político. Gipuzkoa. Mayo 2025" (PDF). Gizaker (in Spanish). 20 June 2025.
7. "Sociómetro Político. Gipuzkoa. Diciembre 2024" (PDF). Gizaker (in Spanish). 24 January 2025.