# Opinion polling for the 2004 Spanish general election

In the run up to the 2004 Spanish general election, various organisations carried out opinion polling to gauge voting intention in Spain during the term of the 7th Cortes Generales. Results of such polls are displayed in this article. The date range for these opinion polls is from the previous general election, held on 12 March 2000, to the day the next election was held, on 14 March 2004.
Voting intention estimates refer mainly to a hypothetical Congress of Deputies election. 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 poll.

## Electoral polling
### Nationwide polling
#### Voting intention estimates

The table below lists nationwide voting intention estimates. Refusals are generally excluded from the party vote percentages, while question wording and the treatment of "don't know" responses and those not intending to vote may vary between polling organisations. When available, seat projections determined by the polling organisations are displayed below (or in place of) the percentages in a smaller font; 176 seats were required for an absolute majority in the Congress of Deputies.

##### Color key

Poll conducted after legal ban on opinion polls  Exit poll
| Polling firm/Commissioner | Fieldwork date | Sample size | Turnout | | | | | PNV | BNG | | | Lead |
| 2004 general election | 14 Mar 2004 | — | 75.7 | 37.7 148 | 42.6 164 | 5.0 5 | 3.2 10 | 1.6 7 | 0.8 2 | 0.9 3 | 2.5 8 | 4.9 |
| Sigma Dos/Antena 3 | 14 Mar 2004 | ? | ? | 37.5 | 42.7 | 5.3 | 3.1 | 1.7 | – | – | – | 5.2 |
| Sigma Dos/Antena 3 | 14 Mar 2004 | 75,000 | ? | 38.5 153/161 | 41.0 152/159 | 5.4 6/7 | 3.3 10/11 | 1.6 7 | 1.0 3 | 0.9 3 | 2.3 6 | 2.5 |
| Ipsos–Eco/RTVE–FORTA | 14 Mar 2004 | 210,000 | ? | 36.9 150/154 | 41.4 154/158 | 6.3 9/11 | 3.0 10/12 | 1.4 6/7 | 0.9 2 | 0.9 3/4 | 2.3 7/8 | 4.5 |
| TNS Demoscopia/Tele 5 | 11–13 Mar 2004 | ? | ? | 40.6 168/170 | 38.3 140/143 | 6.5 8/10 | 3.0 10/11 | 1.5 7 | ? 2 | 0.9 3 | 2.7 6/7 | 2.3 |
| Opina/Cadena SER | 12 Mar 2004 | ? | ? | 39.5 154/160 | 40.5 151/159 | 6.1 9/10 | 3.0 10/11 | 1.2 7/8 | ? 2/3 | ? 3/4 | ? 5/6 | 1.0 |
| Sigma Dos | 12 Mar 2004 | ? | ? | 40.3 | 39.6 | 5.2 | 3.3 | 1.8 | – | – | – | 0.7 |
| Sigma Dos | 10 Mar 2004 | ? | ? | 41.2 | 38.4 | 5.3 | 3.3 | 1.8 | – | – | – | 2.8 |
| TNS Demoscopia/Tele 5 | 8 Mar 2004 | 3,031 | ? | 42.5 174/176 | 37.8 136/137 | – | – | – | – | – | – | 4.7 |
| Opina/Cadena SER | 7 Mar 2004 | ? | ? | 40.5 161/166 | 38.0 140/145 | 5.8 11/12 | 3.6 10/11 | 1.4 7/8 | 1.1 3 | 0.8 4 | 2.0 7/8 | 2.5 |
| Opina/Cadena SER | 6 Mar 2004 | ? | ? | 40.5 | 37.0 | 5.8 | 3.8 | 1.5 | – | – | – | 3.5 |
| Sigma Dos/El Mundo | 5–6 Mar 2004 | 1,000 | ? | 42.1 168/173 | 37.6 138/144 | 5.3 6/8 | 3.4 11 | 1.8 7 | 1.2 3 | 1.0 3/4 | 2.0 5/6 | 4.5 |
| Celeste-Tel/La Razón | 4–6 Mar 2004 | 601 | 74.1 | 42.9 173/177 | 37.6 136/141 | 6.6 9/10 | 3.4 11/12 | 1.7 7/8 | 1.1 2 | 0.9 3 | 1.6 5/6 | 5.3 |
| Opina/Cadena SER | 5 Mar 2004 | ? | ? | 41.0 | 37.0 | 6.0 | 4.0 | 1.5 | – | – | – | 4.0 |
| Celeste-Tel/La Razón | 17 Feb–5 Mar 2004 | 2,404 | 72.1 | 42.9 171/176 | 37.2 135/141 | 5.9 8 | 3.5 11/12 | 1.7 7/8 | – | 0.9 3 | 1.5 5/6 | 5.7 |
| Opina/Cadena SER | 4 Mar 2004 | ? | ? | 41.5 | 36.5 | 7.0 | 3.5 | 1.5 | – | – | – | 5.0 |
| TNS Demoscopia/Tele 5 | 3 Mar 2004 | ? | ? | 42.1 175/176 | 37.0 136 | – | – | – | – | – | – | 5.1 |
| Opina/Cadena SER | 3 Mar 2004 | ? | ? | 41.5 163/171 | 36.5 135/143 | 6.5 11/12 | 3.0 10/11 | 1.6 7/8 | 1.1 2/3 | 0.8 3/4 | 2.0 6/8 | 5.0 |
| Vox Pública/El Periódico | 1–3 Mar 2004 | 2,071 | 72–73 | 42.5 169/173 | 37.3 135/140 | 7.1 10/12 | 3.2 10/11 | 1.5 7 | – | – | 1.9 6/7 | 5.2 |
| Citigate Sanchís/La Gaceta | 1–3 Mar 2004 | 1,007 | ? | 42.8 | 37.3 | 5.7 | 3.1 | 1.5 | – | 1.4 | 2.2 | 5.5 |
| Noxa/La Vanguardia | 27 Feb–3 Mar 2004 | 2,200 | ? | 41.4 162/167 | 39.2 143/147 | 6.3 9/10 | 3.0 10 | 2.1 7 | ? 2/3 | 1.0 4 | 2.1 5/6 | 2.2 |
| Opina/Cadena SER | 2 Mar 2004 | ? | ? | 41.0 | 36.5 | 6.5 | 3.2 | 1.7 | – | – | – | 4.5 |
| Sigma Dos/El Mundo | 24 Feb–2 Mar 2004 | 12,500 | ? | 42.8 172/177 | 36.6 134/139 | 5.7 7/10 | 3.3 11 | 1.8 7 | 1.2 3 | – | 1.9 5 | 6.2 |
| Opina/Cadena SER | 1 Mar 2004 | ? | ? | 40.5 | 36.5 | 6.5 | 3.2 | 1.7 | – | – | – | 4.0 |
| Opina/El País | 27 Feb–1 Mar 2004 | 4,000 | ? | 42.0 168/172 | 38.0 134/141 | 6.3 11 | 3.0 10/11 | 1.7 7/8 | 0.9 3 | 0.9 3/4 | 1.9 7 | 4.0 |
| Opina/Cadena SER | 29 Feb 2004 | ? | ? | 40.5 164/169 | 36.5 138/144 | 7.0 12 | 3.5 10/11 | 1.5 7/8 | 1.0 2/3 | 1.0 3/4 | 1.5 6 | 4.0 |
| Ipsos–Eco/Prensa Ibérica | 29 Feb 2004 | ? | ? | 41.3 170/174 | 37.4 131/135 | 6.5 ? | 3.4 ? | 1.4 ? | – | – | – | 3.9 |
| Citigate Sanchís/La Gaceta | 29 Feb 2004 | ? | ? | 44.4 | 36.8 | 5.6 | 3.2 | 2.1 | – | – | – | 7.6 |
| Opina/Cadena SER | 28 Feb 2004 | ? | ? | 41.0 | 36.5 | 6.5 | 3.8 | 1.6 | – | – | – | 4.5 |
| Opina/Cadena SER | 27 Feb 2004 | ? | ? | 41.5 166/172 | 36.5 136/144 | 6.4 10/12 | 3.8 10/12 | 1.6 6/8 | – | – | – | 5.0 |
| Atento STC/Expansión | 23–27 Feb 2004 | ? | ? | 40.4 | 37.5 | 5.0 | – | – | – | – | – | 2.9 |
| Opina/Cadena SER | 26 Feb 2004 | 3,000 | ? | 41.5 166/172 | 36.5 136/144 | 6.0 10/12 | 4.0 10/12 | 1.5 6/8 | – | – | – | 5.0 |
| Infortécnica | 26 Feb 2004 | 4,656 | ? | ? 165/175 | ? 130/138 | ? 13/17 | ? 9/12 | ? 7/8 | ? 2/4 | ? 4/6 | ? 4/6 | ? |
| Sigma Dos/Antena 3 | 25 Feb 2004 | ? | ? | 43.3 | 35.8 | 5.8 | 3.6 | 1.4 | – | – | – | 7.5 |
| Celeste-Tel/La Razón | 17–25 Feb 2004 | ? | ? | 42.2 170/171 | 36.1 141/142 | 5.4 6/7 | 3.9 11/13 | 1.8 8 | ? 3 | ? 4 | ? 2/3 | 6.1 |
| TNS Demoscopia/Vocento | 10–25 Feb 2004 | 12,760 | 68–70 | 42.2 174/177 | 37.2 133/137 | 7.0 8/10 | 3.1 10/11 | 1.5 7 | 1.0 2 | 0.9 3 | 2.1 6/7 | 5.0 |
| Gallup | 2–20 Feb 2004 | 2,036 | 69.1 | 43.9 | 35.1 | 6.1 | 3.2 | 1.5 | – | – | – | 8.8 |
| Metra Seis/Colpisa | 6–16 Feb 2004 | 5,200 | 70–72 | 42.0 170/176 | 36.2 131/136 | 5.8 7/9 | 3.4 11/12 | 1.9 7/9 | 1.2 2/3 | 0.9 4/5 | 2.1 5/7 | 5.8 |
| CIS | 24 Jan–15 Feb 2004 | 24,109 | 75.1 | 42.2 176 | 35.5 131 | 6.6 10 | 3.7 12 | 1.8 7 | 1.2 3 | 1.0 3 | 1.9 6 | 6.7 |
| Noxa/La Vanguardia | 6–12 Feb 2004 | 1,800 | ? | 42.6 164/169 | 38.6 138/142 | 5.8 9/10 | 2.8 9 | 2.2 8/9 | ? 4/5 | 0.9 4 | 2.0 6/7 | 4.0 |
| Opina/Cadena SER | 11 Feb 2004 | 1,000 | ? | 41.0 | 38.0 | 5.0 | 5.0 | 2.0 | – | – | – | 3.0 |
| Sigma Dos/Antena 3 | 9–10 Feb 2004 | 1,000 | ? | 43.5 | 35.4 | 5.2 | 3.8 | 1.6 | – | – | – | 8.1 |
| Celeste-Tel/La Razón | 8 Feb 2004 | ? | ? | 43.9 175 | 35.8 136/137 | 5.4 5/6 | 3.9 12/13 | 1.8 8 | – | ? 4 | ? 3 | 8.1 |
| Sigma Dos/El Mundo | 8 Feb 2004 | ? | ? | 44.3 | 34.8 | 5.6 | 3.6 | 1.5 | – | – | – | 9.5 |
| Opina/Cadena SER | 31 Jan 2004 | 1,000 | ? | 41.0 | 37.0 | 4.0 | 4.0 | 2.0 | – | – | – | 4.0 |
| Opina/El País | 25 Jan 2004 | 3,000 | ? | 42.5 171/175 | 37.0 135/138 | 5.5 8/11 | 3.5 12 | 1.5 7 | 1.0 2 | 1.3 5 | 1.5 4 | 5.5 |
| Gallup | 5–22 Jan 2004 | 2,028 | 68.3 | 41.9 | 36.2 | 6.7 | 4.3 | 1.7 | – | – | – | 5.7 |
| Vox Pública/El Periódico | 19–21 Jan 2004 | 1,501 | ? | 43.0 170/175 | 38.0 138/142 | 5.5 8/10 | 3.0 10/11 | 1.5 7 | – | – | – | 5.0 |
| Opina/Cadena SER | 16 Jan 2004 | 1,000 | ? | 42.0 | 38.0 | 4.5 | 3.5 | 1.5 | – | – | – | 4.0 |
| Noxa/La Vanguardia | 7–9 Jan 2004 | 1,000 | ? | 42.6 174 | 36.5 137 | 7.2 11 | 3.0 10 | 2.1 9 | – | 1.0 4 | 1.4 3 | 6.1 |
| Sigma Dos/El Mundo | 4 Jan 2004 | ? | ? | 44.6 | 33.9 | 6.2 | 3.8 | 1.3 | – | – | – | 10.7 |
| Opina/Cadena SER | 2 Jan 2004 | ? | ? | 42.0 | 40.0 | 6.0 | 3.5 | 2.0 | – | – | – | 2.0 |
| Gallup | 1–19 Dec 2003 | 2,025 | 70.0 | 44.1 | 35.2 | 6.1 | 3.6 | 1.6 | – | – | – | 8.9 |
| Celeste-Tel/La Razón | 7 Dec 2003 | ? | ? | 43.0 | 35.5 | 5.9 | 3.6 | 2.0 | – | – | – | 7.5 |
| Sigma Dos/El Mundo | 7 Dec 2003 | ? | ? | 44.8 | 33.7 | 6.1 | 3.9 | 1.5 | – | – | – | 11.1 |
| Opina/El País | 7 Dec 2003 | 1,000 | ? | 42.0 | 39.0 | 5.5 | 4.0 | 2.0 | – | – | – | 3.0 |
| Metra Seis/Colpisa | 2–5 Dec 2003 | ? | ? | 44.5 178/185 | 33.1 121/125 | 6.3 8/9 | 4.1 14/15 | 1.4 7 | – | – | – | 11.4 |
| Gallup | 4–25 Nov 2003 | 2,032 | 70.5 | 43.3 | 36.5 | 6.7 | 3.5 | 1.6 | – | – | – | 6.8 |
| Opina/Cadena SER | 19 Nov 2003 | 1,000 | ? | 42.0 | 39.0 | 5.0 | 4.0 | 2.0 | – | – | – | 3.0 |
| CIS | 25–31 Oct 2003 | 2,488 | ? | 42.4 | 34.7 | 5.9 | 4.0 | 1.4 | 1.3 | – | – | 7.7 |
| Gallup | 3–22 Oct 2003 | 2,016 | 69.9 | 42.4 | 36.8 | 6.2 | 3.4 | 1.6 | – | – | – | 5.6 |
| Intercampo/GETS | 17 Sep–2 Oct 2003 | 1,714 | ? | 43.8 | 34.3 | 6.4 | 3.8 | 1.5 | – | – | – | 9.5 |
| Sigma Dos/El Mundo | 28 Sep 2003 | ? | ? | 43.8 | 35.3 | 5.1 | 4.0 | 1.4 | – | – | – | 8.5 |
| Opina/Cadena SER | 24 Sep 2003 | 1,000 | ? | 42.0 | 39.0 | 6.5 | 4.0 | 2.0 | – | – | – | 3.0 |
| Vox Pública/El Periódico | 22–24 Sep 2003 | 1,502 | ? | 44.2 | 37.1 | 6.0 | 3.0 | 1.6 | – | – | – | 7.1 |
| Gallup | 1–24 Sep 2003 | 2,027 | 71.2 | 43.0 | 35.3 | 7.2 | 3.5 | 1.6 | – | – | – | 7.7 |
| Opina/Cadena SER | 10 Sep 2003 | 1,000 | ? | 42.0 | 39.0 | 5.0 | 4.0 | 2.0 | – | – | – | 3.0 |
| Opina/El País | 7 Sep 2003 | 1,000 | ? | 42.0 | 38.0 | 6.5 | 5.5 | 1.8 | – | – | – | 4.0 |
| Celeste-Tel/La Razón | 7 Sep 2003 | ? | ? | 43.2 | 35.3 | 5.9 | 3.7 | 1.9 | – | – | – | 7.9 |
| Opina/Cadena SER | 2 Sep 2003 | 1,000 | ? | 42.0 | 39.0 | 6.0 | 5.0 | 2.0 | – | – | – | 3.0 |
| Opina/Cadena SER | 27 Aug 2003 | 1,000 | ? | 42.0 | 39.0 | 6.5 | 5.5 | 2.0 | – | – | – | 3.0 |
| Gallup | 1–18 Aug 2003 | 2,026 | 70.2 | 43.6 | 36.5 | 5.4 | 3.7 | 1.5 | – | – | – | 7.1 |
| Gallup | 1–24 Jul 2003 | 2,032 | 70.7 | 42.9 | 37.4 | 5.9 | 3.4 | 1.4 | – | – | – | 5.5 |
| Sigma Dos/El Mundo | 20 Jul 2003 | ? | ? | 42.8 | 35.9 | 5.6 | 3.9 | 1.5 | – | – | – | 6.9 |
| CIS | 2–8 Jul 2003 | 2,476 | ? | 41.2 | 35.2 | 6.3 | 3.8 | 1.2 | 1.5 | – | – | 6.0 |
| Ibecom/La Razón | 6 Jul 2003 | ? | ? | 43.6 | 33.9 | 4.4 | 4.3 | 1.3 | – | – | – | 9.7 |
| Opina/Cadena SER | 1 Jul 2003 | 1,000 | ? | 40.0 | 39.0 | 5.0 | 5.0 | 2.0 | – | – | – | 1.0 |
| Sigma Dos/El Mundo | 24–26 Jun 2003 | 1,000 | ? | 42.6 | 35.4 | 6.2 | 4.0 | 1.6 | – | – | – | 7.2 |
| Vox Pública/El Periódico | 23–25 Jun 2003 | 1,502 | ? | 41.6 | 37.5 | 5.9 | 3.1 | 1.2 | – | – | – | 4.1 |
| Gallup | 2–20 Jun 2003 | 2,024 | 75.1 | 40.7 | 37.2 | 7.4 | 3.2 | 1.2 | – | – | – | 3.5 |
| Opina/Cadena SER | 11 Jun 2003 | ? | ? | 42.0 | 39.0 | 4.5 | 4.5 | 2.0 | – | – | – | 3.0 |
| Opina/Cadena SER | 28 May 2003 | ? | ? | 41.0 | 41.0 | 5.0 | 4.0 | 2.0 | – | – | – | Tie |
| Gallup | 5–26 May 2003 | 2,026 | 73.4 | 38.4 | 38.8 | 6.8 | 2.9 | 1.4 | – | – | – | 0.4 |
| 2003 local elections | 25 May 2003 | — | 67.8 | 34.3 | 34.8 | 6.1 | 3.4 | 1.8 | 1.4 | 1.2 | 1.8 | 0.5 |
| Opina/Cadena SER | 15 May 2003 | 1,000 | ? | 39.0 | 39.0 | 6.0 | 4.0 | 1.8 | – | – | – | Tie |
| CIS | 24–30 Apr 2003 | 2,494 | 74.2 | 37.3 | 39.5 | 6.3 | 3.3 | 1.3 | 1.3 | – | – | 2.2 |
| Sigma Dos/El Mundo | 27 Apr 2003 | ? | ? | 41.2 | 38.7 | 5.0 | 3.7 | 1.5 | – | – | – | 2.5 |
| Noxa/La Vanguardia | 22–24 Apr 2003 | 1,000 | ? | 39.3 | 42.3 | 6.1 | 3.2 | 1.5 | – | – | – | 3.0 |
| Ipsos–Eco/ABC | 22–24 Apr 2003 | 2,254 | ? | 33.9 | 39.4 | 6.1 | 3.8 | 1.7 | – | – | – | 5.5 |
| Opina/Cadena SER | 23 Apr 2003 | 1,000 | ? | 38.0 | 42.0 | 6.0 | 4.5 | 2.0 | – | – | – | 4.0 |
| Gallup | 1–22 Apr 2003 | 2,020 | 70.2 | 35.8 | 43.2 | 6.3 | 3.5 | 1.6 | – | – | – | 7.4 |
| Opina/Cadena SER | 2 Apr 2003 | ? | ? | 36.5 | 43.0 | 6.0 | 4.2 | 2.0 | – | – | – | 6.5 |
| Vox Pública/El Periódico | 31 Mar–2 Apr 2003 | 1,503 | ? | 35.9 | 42.6 | 6.1 | 3.6 | 1.5 | – | – | – | 6.7 |
| Sigma Dos/El Mundo | 30 Mar 2003 | ? | ? | 38.6 | 40.7 | 5.1 | 3.6 | 1.5 | – | – | – | 2.1 |
| Opina/El País | 25–26 Mar 2003 | 1,000 | ? | 36.0 | 42.0 | 6.2 | 4.2 | 2.0 | – | – | – | 6.0 |
| Gallup | 3–25 Mar 2003 | 2,016 | 68.8 | 38.6 | 42.1 | 5.1 | 3.8 | 1.6 | – | – | – | 3.5 |
| Opina/Cadena SER | 21 Mar 2003 | 1,000 | ? | 37.0 | 43.0 | 6.0 | 4.0 | 1.8 | – | – | – | 6.0 |
| Opina/Cadena SER | 8 Mar 2003 | 1,000 | ? | 37.0 | 42.5 | 5.0 | 4.0 | 1.5 | – | – | – | 5.5 |
| Gallup | 3–24 Feb 2003 | 2,028 | 68.5 | 39.7 | 39.8 | 5.5 | 3.7 | 1.6 | – | – | – | 0.1 |
| Sigma Dos/El Mundo | 18–20 Feb 2003 | 1,000 | ? | 38.5 | 40.2 | 5.6 | 3.9 | 1.5 | – | – | – | 1.7 |
| Opina/Cadena SER | 19 Feb 2003 | 1,000 | ? | 38.0 | 42.0 | 5.5 | 4.0 | 1.8 | – | – | – | 4.0 |
| Opina/Cadena SER | 6 Feb 2003 | ? | ? | 38.0 | 42.0 | 5.0 | 4.0 | 1.8 | – | – | – | 4.0 |
| Opina/El País | 3 Feb 2003 | 1,000 | ? | 40.0 | 42.0 | 4.0 | 4.0 | 1.5 | – | – | – | 2.0 |
| CIS | 21–26 Jan 2003 | 2,480 | 74.4 | 39.8 | 37.3 | 5.5 | 3.7 | 1.5 | 1.4 | – | – | 2.5 |
| Gallup | 7–23 Jan 2003 | 2,034 | 68.9 | 39.6 | 39.5 | 4.9 | 3.3 | 1.6 | – | – | – | 0.1 |
| Opina/Cadena SER | 22 Jan 2003 | 1,000 | ? | 41.0 | 41.0 | 5.0 | 4.0 | 1.6 | – | – | – | Tie |
| Sigma Dos/El Mundo | 20 Jan 2003 | ? | ? | 41.6 | 38.6 | 4.9 | 3.9 | 1.3 | – | – | – | 3.0 |
| Vox Pública/El Periódico | 13–16 Jan 2003 | 1,501 | ? | 40.4 | 39.0 | 6.0 | 3.3 | 1.1 | – | – | – | 1.4 |
| Opina/Cadena SER | 8 Jan 2003 | 1,000 | ? | 41.0 | 41.0 | 4.8 | 4.5 | 1.8 | – | – | – | Tie |
| Gallup | 2–23 Dec 2002 | 2,011 | 68.5 | 38.2 | 40.8 | 5.0 | 4.0 | 1.4 | – | – | – | 2.6 |
| Opina/Cadena SER | 17 Dec 2002 | 1,000 | ? | 39.0 | 42.0 | 5.0 | 4.0 | 1.5 | – | – | – | 3.0 |
| Sigma Dos/El Mundo | 9–11 Dec 2002 | 1,000 | ? | 41.7 | 38.8 | 4.7 | 3.7 | 1.4 | – | – | – | 2.9 |
| Opina/Cadena SER | 4 Dec 2002 | 1,000 | ? | 41.0 | 41.0 | 5.0 | 4.0 | 1.5 | – | – | – | Tie |
| La Vanguardia | 25 Nov 2002 | ? | ? | 38.6 153 | 40.0 154 | ? 7 | ? 14 | – | – | – | – | 1.4 |
| Gallup | 4–25 Nov 2002 | 2,018 | 70.0 | 40.6 | 39.8 | 5.4 | 3.3 | 1.2 | – | – | – | 0.8 |
| Opina/El País | 23–24 Nov 2002 | 1,000 | ? | 40.0 | 40.0 | 5.0 | 4.5 | 1.8 | – | – | – | Tie |
| Opina/Cadena SER | 20 Nov 2002 | 1,000 | ? | 42.0 | 40.0 | 5.0 | 4.8 | 1.5 | – | – | – | 2.0 |
| Sigma Dos/El Mundo | 5–8 Nov 2002 | 3,400 | ? | 41.9 | 38.4 | 4.6 | 4.0 | 1.4 | – | – | – | 3.5 |
| Opina/Cadena SER | 6 Nov 2002 | 1,000 | ? | 41.0 | 41.0 | 5.0 | 4.0 | 1.8 | – | – | – | Tie |
| Opina/El País | 28–29 Oct 2002 | ? | ? | 41.0 | 41.0 | 5.2 | 4.0 | 1.7 | – | – | – | Tie |
| Gallup | 1–24 Oct 2002 | 2,018 | 69.4 | 42.7 | 37.2 | 5.1 | 3.8 | 1.4 | – | – | – | 5.5 |
| Opina/Cadena SER | 23 Oct 2002 | 1,000 | ? | 41.0 | 39.5 | 5.1 | 4.0 | 1.5 | – | – | – | 1.5 |
| Ibecom/La Razón | 17–21 Oct 2002 | ? | ? | 43.5 | 38.7 | 2.9 | 3.1 | 1.1 | – | – | – | 4.8 |
| CIS | 16–21 Oct 2002 | 2,489 | 74.6 | 41.5 | 37.3 | 4.6 | 3.7 | 1.4 | 1.2 | – | – | 4.2 |
| Sigma Dos/El Mundo | 14 Oct 2002 | ? | ? | 41.8 | 37.9 | 5.0 | 4.2 | 1.5 | – | – | – | 3.9 |
| Opina/Cadena SER | 9 Oct 2002 | 1,000 | ? | 42.0 | 38.5 | 5.0 | 4.0 | 2.0 | – | – | – | 3.5 |
| Vox Pública/El Periódico | 7–9 Oct 2002 | 1,507 | ? | 42.4 165/170 | 38.7 145/150 | 4.8 ? | 3.3 ? | 1.2 ? | – | – | – | 3.7 |
| CIS | 9 Sep–9 Oct 2002 | 10,476 | 75.6 | 41.0 | 37.1 | 5.4 | 4.0 | 1.5 | 1.2 | – | – | 3.9 |
| Intercampo/GETS | 18 Sep–3 Oct 2002 | ? | ? | 41.6 | 36.6 | 5.6 | 4.4 | 1.5 | – | – | – | 5.0 |
| Opina/El País | 29 Sep 2002 | ? | ? | 42.0 | 39.0 | 4.5 | 3.8 | 1.6 | 0.9 | 0.9 | 1.0 | 3.0 |
| Opina/Cadena SER | 25 Sep 2002 | 1,000 | ? | 41.0 | 39.0 | 5.0 | 4.0 | 2.0 | – | – | – | 2.0 |
| Ipsos–Eco/ABC | 6–13 Sep 2002 | 2,010 | ? | 40.7 | 37.6 | 5.7 | 4.0 | 1.5 | 1.4 | – | – | 3.1 |
| Opina/Cadena SER | 10 Sep 2002 | 1,000 | ? | 42.0 | 39.5 | 5.0 | 4.0 | 1.7 | – | – | – | 2.5 |
| Opina/Cadena SER | 27 Aug 2002 | 1,000 | ? | 41.0 | 41.0 | 5.5 | 4.0 | 1.8 | – | – | – | Tie |
| Gallup | 1–23 Aug 2002 | 2,008 | 68.0 | 42.1 | 38.0 | 5.5 | 3.1 | 1.4 | – | – | – | 4.1 |
| Gallup | 2–29 Jul 2002 | 2,013 | 67.8 | 42.5 | 38.0 | 5.7 | 3.4 | 1.4 | – | – | – | 4.5 |
| CIS | 16–21 Jul 2002 | 2,482 | 74.0 | 41.0 | 36.3 | 5.0 | 4.2 | 1.4 | 1.2 | – | – | 4.7 |
| Sigma Dos/El Mundo | 14 Jul 2002 | ? | ? | 43.3 | 36.2 | 5.7 | 3.9 | 1.5 | – | – | – | 7.1 |
| La Vanguardia | 26–30 Jun 2002 | 2,494 | ? | 39.2 158 | 36.8 145 | 6.3 9 | 3.5 13 | – | – | – | – | 2.4 |
| Opina/Cadena SER | 27 Jun 2002 | 1,000 | ? | 41.0 | 40.0 | 5.0 | 4.0 | 2.0 | – | – | – | 1.0 |
| Vox Pública/El Periódico | 24–26 Jun 2002 | 1,504 | ? | 41.9 | 38.7 | 5.9 | 3.1 | 1.1 | – | – | – | 3.2 |
| Gallup | 1–24 Jun 2002 | 2,016 | 68.3 | 42.7 | 36.8 | 5.7 | 4.2 | 1.6 | – | – | – | 5.9 |
| Opina/Cadena SER | 21 Jun 2002 | ? | ? | 41.0 | 39.5 | 5.0 | 4.5 | 2.0 | – | – | – | 1.5 |
| Opina/Cadena SER | 5 Jun 2002 | 1,000 | ? | 41.0 | 39.0 | 5.0 | 4.5 | 2.5 | – | – | – | 2.0 |
| La Vanguardia | 20–26 May 2002 | 2,496 | ? | 40.0 162 | 36.9 142 | 6.6 8 | 4.1 15 | – | – | – | – | 3.1 |
| Opina/Cadena SER | 22 May 2002 | 1,000 | ? | 41.0 | 40.0 | 5.0 | 4.5 | 2.0 | – | – | – | 1.0 |
| Gallup | 3–22 May 2002 | 2,010 | 70.2 | 42.3 | 37.6 | 5.3 | 3.6 | 1.5 | – | – | – | 4.7 |
| Opina/Cadena SER | 8 May 2002 | 1,000 | ? | 41.0 | 39.0 | 5.0 | 4.5 | 2.0 | – | – | – | 2.0 |
| Sigma Dos/El Mundo | 3 May 2002 | ? | ? | 43.2 | 37.2 | 4.7 | 3.5 | 1.5 | – | – | – | 6.0 |
| Opina/Cadena SER | 24 Apr 2002 | 1,000 | ? | 42.0 | 39.0 | 5.0 | 4.5 | 2.0 | – | – | – | 3.0 |
| Gallup | 1–23 Apr 2002 | 2,017 | 68.2 | 41.8 | 37.6 | 5.0 | 4.2 | 1.7 | – | – | – | 4.2 |
| CIS | 16–21 Apr 2002 | 2,498 | 73.9 | 42.4 | 34.4 | 5.4 | 4.4 | 1.5 | 1.5 | – | – | 8.0 |
| Vox Pública/El Periódico | 15–17 Apr 2002 | 1,510 | ? | 42.5 | 37.6 | 5.2 | 3.9 | 1.4 | – | – | – | 4.9 |
| Opina/Cadena SER | 10 Apr 2002 | 1,000 | ? | 42.0 | 38.5 | 5.0 | 4.5 | 2.0 | – | – | – | 3.5 |
| Gallup | 4–27 Mar 2002 | 2,029 | 68.3 | 41.8 | 36.9 | 5.8 | 3.7 | 1.7 | – | – | – | 4.9 |
| Opina/Cadena SER | 26 Mar 2002 | 1,000 | ? | 42.0 | 38.0 | 5.0 | 5.0 | 2.0 | – | – | – | 4.0 |
| Opina/Cadena SER | 12 Mar 2002 | 1,000 | ? | 42.0 | 39.0 | 5.0 | 4.5 | 2.0 | – | – | – | 3.0 |
| Opina/Cadena SER | 27 Feb 2002 | 1,000 | ? | 43.5 | 38.0 | 5.0 | 4.5 | 1.7 | – | – | – | 5.5 |
| Gallup | 4–27 Feb 2002 | 2,030 | 70.3 | 43.1 | 37.1 | 5.0 | 3.4 | 1.4 | – | – | – | 6.0 |
| Opina/Cadena SER | 13 Feb 2002 | 1,000 | ? | 42.5 | 38.0 | 5.0 | 5.0 | 1.7 | – | – | – | 4.5 |
| Vox Pública/El Periódico | 4–5 Feb 2002 | 1,506 | ? | 44.1 | 36.8 | 4.9 | 3.4 | 1.7 | – | – | – | 7.3 |
| CIS | 27–31 Jan 2002 | 2,498 | 74.3 | 43.9 | 34.2 | 5.8 | 4.0 | 1.5 | 1.2 | – | – | 9.7 |
| Opina/Cadena SER | 30 Jan 2002 | 1,000 | ? | 43.5 | 38.0 | 4.5 | 4.5 | 2.0 | – | – | – | 5.5 |
| Gallup | 4–29 Jan 2002 | 2,031 | 70.1 | 43.2 | 36.8 | 5.4 | 3.5 | 1.6 | – | – | – | 6.4 |
| Opina/Cadena SER | 16 Jan 2002 | 1,000 | ? | 43.5 | 38.0 | 5.0 | 5.0 | 2.0 | – | – | – | 5.5 |
| Opina/Cadena SER | 3 Jan 2002 | 1,000 | ? | 43.5 | 38.5 | 5.0 | 4.5 | 2.0 | – | – | – | 5.0 |
| Sigma Dos/El Mundo | 26–28 Dec 2001 | ? | ? | 44.7 | 35.5 | 4.4 | 3.6 | 1.5 | – | – | – | 9.2 |
| Gallup | 3–28 Dec 2001 | 2,020 | 70.6 | 42.2 | 38.4 | 5.2 | 3.4 | 1.5 | – | – | – | 3.8 |
| Opina/Cadena SER | 24 Dec 2001 | ? | ? | 42.0 | 37.0 | 5.5 | 4.0 | 2.0 | 1.4 | – | – | 5.0 |
| Opina/Cadena SER | 5 Dec 2001 | 1,000 | ? | 41.5 | 39.0 | 5.5 | 5.0 | 2.0 | – | – | – | 2.5 |
| Gallup | 2–28 Nov 2001 | 2,021 | 69.8 | 44.2 | 36.8 | 5.3 | 3.5 | 1.4 | – | – | – | 7.4 |
| Opina/Cadena SER | 20 Nov 2001 | 1,000 | ? | 42.5 | 39.0 | 5.0 | 4.5 | 2.0 | – | – | – | 3.5 |
| Opina/Cadena SER | 7 Nov 2001 | 1,000 | ? | 43.0 | 38.5 | 5.5 | 4.5 | 1.5 | – | – | – | 4.5 |
| Gallup | 1–30 Oct 2001 | 2,016 | 70.1 | 43.9 | 37.0 | 4.9 | 3.8 | 1.5 | – | – | – | 6.9 |
| CIS | 24–29 Oct 2001 | 2,499 | 74.1 | 43.5 180 | 34.0 125 | 5.5 8 | 4.5 16 | 1.4 7 | 1.4 ? | – | – | 9.5 |
| La Vanguardia | 28 Oct 2001 | ? | ? | 41.3 167 | 37.0 138 | – | – | – | – | – | – | 4.3 |
| Opina/Cadena SER | 24 Oct 2001 | 1,000 | ? | 44.0 | 38.5 | 5.0 | 4.5 | 1.5 | – | – | – | 5.5 |
| Vox Pública/El Periódico | 22–23 Oct 2001 | 1,509 | ? | 44.5 | 37.9 | 5.6 | 3.7 | 1.4 | – | – | – | 6.6 |
| Intercampo/GETS | 19 Sep–4 Oct 2001 | ? | ? | 42.4 | 36.3 | 5.6 | 4.1 | 1.8 | – | – | – | 6.1 |
| Opina/Cadena SER | 2 Oct 2001 | ? | ? | 43.5 | 40.0 | 5.5 | 4.0 | 1.5 | – | – | – | 3.5 |
| Gallup | 6–27 Sep 2001 | 2,027 | 70.3 | 42.3 | 37.2 | 5.5 | 4.0 | 1.6 | – | – | – | 5.1 |
| Opina/Cadena SER | 18 Sep 2001 | 1,000 | ? | 43.5 | 39.0 | 5.0 | 4.5 | 1.5 | – | – | – | 4.5 |
| Opina/Cadena SER | 5 Sep 2001 | 1,000 | ? | 44.0 | 38.0 | 5.0 | 4.6 | 2.0 | – | – | – | 6.0 |
| Gallup | 2–30 Jul 2001 | 2,024 | 70.2 | 42.1 | 38.3 | 5.1 | 3.4 | 2.0 | – | – | – | 3.8 |
| CIS | 13–18 Jul 2001 | 2,485 | 75.1 | 43.6 178 | 34.9 129 | 5.6 ? | 3.7 ? | 1.5 ? | 1.5 ? | – | – | 8.7 |
| Opina/Cadena SER | 30 Jun 2001 | 1,000 | ? | 43.5 | 40.0 | 5.0 | 4.5 | 1.5 | – | – | – | 3.5 |
| Vox Pública/El Periódico | 25–28 Jun 2001 | 1,506 | ? | 44.0 | 37.1 | 5.9 | 3.2 | 1.2 | – | – | – | 6.9 |
| Gallup | 6–27 Jun 2001 | 2,008 | 69.5 | 43.6 | 36.8 | 5.2 | 3.6 | 1.5 | – | – | – | 6.8 |
| Sigma Dos/El Mundo | 24 Jun 2001 | ? | ? | 43.4 | 35.8 | 5.4 | 3.9 | 1.4 | – | – | – | 7.6 |
| Opina/Cadena SER | 13 Jun 2001 | 1,000 | ? | 44.0 | 38.0 | 6.0 | 4.5 | 1.5 | – | – | – | 6.0 |
| La Vanguardia | 30 May 2001 | ? | ? | 43.5 180 | 35.1 128 | – | – | – | – | – | – | 8.4 |
| Opina/Cadena SER | 30 May 2001 | 1,000 | ? | 43.0 | 39.5 | 5.0 | 4.5 | 1.5 | – | – | – | 3.5 |
| Gallup | 4–25 May 2001 | 2,031 | 69.8 | 45.0 | 34.3 | 6.3 | 4.3 | 1.4 | – | – | – | 10.7 |
| Opina/Cadena SER | 14 May 2001 | 1,000 | ? | 44.0 | 38.0 | 5.5 | 4.5 | 2.3 | – | – | – | 6.0 |
| CIS | 20–30 Apr 2001 | 2,492 | 73.9 | 43.5 179 | 35.2 131 | 4.9 ? | 4.0 ? | 1.3 ? | 1.4 ? | – | – | 8.3 |
| Gallup | 4–25 Apr 2001 | 2,026 | 69.8 | 43.4 | 37.6 | 4.9 | 3.4 | 1.5 | – | – | – | 5.8 |
| Opina/Cadena SER | 24 Apr 2001 | 1,000 | ? | 44.0 | 38.5 | 5.5 | 4.0 | 2.0 | – | – | – | 5.5 |
| Vox Pública/El Periódico | 16–18 Apr 2001 | 1,514 | ? | 43.7 | 38.6 | 3.7 | 3.4 | 1.5 | – | – | – | 5.1 |
| Opina/Cadena SER | 11 Apr 2001 | ? | ? | 43.0 | 40.0 | 4.5 | 4.5 | 1.7 | – | – | – | 3.0 |
| Opina/Cadena SER | 4 Apr 2001 | ? | ? | 42.0 | 37.0 | 5.0 | 4.0 | 1.5 | – | – | – | 5.0 |
| Gallup | 5–30 Mar 2001 | 2,026 | 72.3 | 43.4 | 35.6 | 5.5 | 3.7 | 1.3 | – | – | – | 7.8 |
| Opina/Cadena SER | 7 Mar 2001 | ? | ? | 43.0 | 38.5 | 4.5 | 4.5 | 2.0 | – | – | – | 4.5 |
| La Vanguardia | 28 Feb 2001 | ? | ? | 42.7 177 | 35.9 132 | – | – | – | – | – | – | 6.8 |
| Gallup | 1–26 Feb 2001 | 2,036 | 70.3 | 42.4 | 37.5 | 5.4 | 3.4 | 1.7 | – | – | – | 4.9 |
| Opina/Cadena SER | 21 Feb 2001 | 1,000 | ? | 43.0 | 40.0 | 4.5 | 4.0 | 1.5 | – | – | – | 3.0 |
| Sigma Dos/El Mundo | 18 Feb 2001 | 800 | ? | 43.5 | 35.9 | 4.6 | 4.1 | 1.5 | – | – | – | 7.6 |
| Opina/Cadena SER | 7 Feb 2001 | ? | ? | 43.0 | 40.0 | 5.0 | 4.5 | 2.0 | – | – | – | 3.0 |
| Vox Pública/El Periódico | 29–31 Jan 2001 | 1,519 | ? | 43.5 | 37.5 | 4.0 | 3.5 | 1.5 | – | – | – | 6.0 |
| Gallup | 8–27 Jan 2001 | 2,028 | 71.6 | 41.9 | 37.0 | 5.3 | 4.4 | 1.7 | – | – | – | 4.9 |
| Opina/Cadena SER | 24 Jan 2001 | ? | ? | 44.0 | 39.0 | 4.5 | 4.5 | 1.8 | – | – | – | 5.0 |
| CIS | 18–23 Jan 2001 | 2,486 | 73.9 | 43.5 179 | 36.2 132 | 5.1 ? | 3.9 ? | 1.4 ? | 1.2 ? | – | – | 7.3 |
| Opina/Cadena SER | 16 Jan 2001 | ? | ? | 42.0 | 39.0 | – | – | – | – | – | – | 3.0 |
| Opina/Cadena SER | 10 Jan 2001 | ? | ? | 42.0 | 38.5 | 5.0 | 4.9 | 1.5 | – | – | – | 3.5 |
| Sigma Dos/El Mundo | 22–29 Dec 2000 | ? | ? | 44.6 | 36.2 | 4.2 | 4.0 | 1.4 | – | – | – | 8.4 |
| Opitel/Tele 5 | 28 Dec 2000 | ? | ? | 44.5 | 38.0 | 3.8 | 4.5 | 2.0 | – | – | – | 6.5 |
| Gallup | 7–24 Dec 2000 | ? | ? | 44.4 | 36.9 | 5.4 | 3.7 | 1.9 | – | – | – | 7.5 |
| Opina/Cadena SER | 20 Dec 2000 | ? | ? | 44.5 | 38.5 | 4.2 | 4.3 | 1.8 | – | – | – | 6.0 |
| Opina/Cadena SER | 5 Dec 2000 | ? | ? | 44.5 | 38.5 | 5.0 | 4.0 | 2.0 | – | – | – | 6.0 |
| La Vanguardia | 28 Nov 2000 | ? | ? | 42.6 176 | 36.0 133 | – | – | – | – | – | – | 6.6 |
| Opina/Cadena SER | 22 Nov 2000 | ? | ? | 45.0 | 38.0 | 3.0 | 4.0 | 1.5 | – | – | – | 7.0 |
| Opina/Cadena SER | 8 Nov 2000 | ? | ? | 44.0 | 36.0 | – | – | – | – | – | – | 8.0 |
| Vox Pública/El Periódico | 30–31 Oct 2000 | 1,210 | ? | 44.0 | 36.7 | 4.6 | 4.1 | 1.2 | – | – | – | 7.3 |
| Sigma Dos/El Mundo | 30 Oct 2000 | ? | ? | 46.2 | 34.2 | 4.9 | 3.2 | 1.5 | – | – | – | 12.0 |
| Opina/Cadena SER | 25 Oct 2000 | ? | ? | 42.2 | 32.8 | 5.1 | 3.3 | 1.7 | – | – | – | 9.4 |
| CIS | 17–22 Oct 2000 | 2,497 | ? | 43.7 173/179 | 36.2 131/134 | 5.5 7/8 | 3.8 14 | 1.5 7 | 1.3 ? | – | – | 7.5 |
| Demoscopia/El País | 9 Oct 2000 | ? | ? | 45.0 | 35.8 | 6.9 | 4.4 | 1.4 | – | – | – | 9.2 |
| Intercampo/GETS | 20 Sep–5 Oct 2000 | ? | ? | 42.9 | 33.7 | 5.6 | 4.0 | 1.3 | – | – | – | 9.2 |
| Opitel/Tele 5 | 2 Oct 2000 | ? | ? | 44.8 | 34.9 | 4.6 | 4.5 | 1.0 | – | – | – | 9.9 |
| Gallup | 1–27 Sep 2000 | 2,025 | 71.4 | 45.0 | 34.9 | 5.3 | 4.1 | 1.3 | – | – | – | 10.1 |
| La Vanguardia | 20 Jul 2000 | ? | ? | 47.1 188 | 31.5 119 | – | – | – | – | – | – | 15.6 |
| CIS | 13–18 Jul 2000 | 2,493 | 72.9 | 46.6 186 | 31.6 119/120 | 5.9 9 | 4.3 15/16 | 1.4 7 | 1.5 ? | – | – | 15.0 |
| Sigma Dos/El Mundo | 16 Jul 2000 | ? | ? | 45.7 | 33.6 | 5.9 | 3.5 | 1.6 | – | – | – | 12.1 |
| Vox Pública/El Periódico | 26–30 Jun 2000 | 2,300 | ? | 46.5 | 30.5 | 5.6 | 3.8 | 1.0 | – | – | – | 16.0 |
| La Vanguardia | 7 Jun 2000 | ? | ? | 47.5 189 | 31.1 118 | – | – | – | – | – | – | 16.4 |
| CIS | 29 Apr–3 May 2000 | 2,491 | 72.0 | 45.3 185 | 32.7 125 | 5.9 ? | 4.0 ? | 1.2 ? | 1.5 ? | – | – | 12.6 |
| 2000 general election | 12 Mar 2000 | — | 68.7 | 44.5 183 | 34.2 125 | 5.4 8 | 4.2 15 | 1.5 7 | 1.3 3 | 1.1 4 | 0.8 1 | 10.3 |

#### Voting preferences

The table below lists raw, unweighted voting preferences.
| Polling firm/Commissioner | Fieldwork date | Sample size | | | | | PNV | BNG | | | ? | N | Lead |
| 2004 general election | 14 Mar 2004 | — | 28.8 | 32.7 | 3.8 | 2.5 | 1.2 | 0.6 | 0.7 | 1.9 | — | 22.7 | 3.9 |
| Vox Pública/El Periódico | 1–3 Mar 2004 | 2,071 | 30.9 | 27.0 | 4.9 | 2.0 | 0.9 | – | – | – | 24.3 | 2.6 | 3.9 |
| Noxa/La Vanguardia | 27 Feb–3 Mar 2004 | 2,200 | 30.9 | 31.2 | – | – | – | – | – | – | – | – | 0.3 |
| ASEP | 16–21 Feb 2004 | 1,212 | 31.2 | 27.3 | 6.0 | 4.1* | * | ** | * | 2.6** | 16.5 | 8.0 | 3.9 |
| Gallup | 2–20 Feb 2004 | 2,036 | 21.6 | 26.9 | 5.0 | 1.0 | 0.7 | – | – | – | 24.1 | 16.5 | 5.3 |
| CIS | 24 Jan–15 Feb 2004 | 24,109 | 26.2 | 22.8 | 4.0 | 2.1 | 0.8 | 0.5 | 0.4 | 1.5 | 31.0 | 6.8 | 3.4 |
| Noxa/La Vanguardia | 6–12 Feb 2004 | 1,800 | 32.6 | 31.9 | – | – | – | – | – | – | – | – | 0.7 |
| ASEP | 19–24 Jan 2004 | 1,201 | 31.4 | 29.8 | 5.2 | 5.1* | * | ** | * | 2.9** | 14.4 | 7.3 | 1.6 |
| Gallup | 5–22 Jan 2004 | 2,028 | 22.6 | 24.3 | 4.4 | 1.2 | 1.3 | – | – | – | 26.8 | 16.2 | 1.7 |
| Vox Pública/El Periódico | 19–21 Jan 2004 | 1,501 | 34.9 | 33.0 | 3.7 | 1.1 | 0.7 | – | – | – | 12.8 | 6.5 | 1.9 |
| CIS | 10–15 Jan 2004 | 2,489 | 27.8 | 21.3 | 3.3 | 1.4 | 1.1 | 0.5 | 0.4 | 1.1 | 32.2 | 6.9 | 6.5 |
| Noxa/La Vanguardia | 7–9 Jan 2004 | 1,000 | 36.5 | 28.2 | – | – | – | – | – | – | – | – | 8.3 |
| Gallup | 1–19 Dec 2003 | 2,025 | 23.5 | 21.0 | 4.9 | 1.1 | 1.5 | – | – | – | 27.6 | 17.9 | 2.5 |
| ASEP | 9–13 Dec 2003 | 1,207 | 29.1 | 30.4 | 4.0 | 5.5* | * | ** | * | 3.4** | 14.1 | 10.5 | 1.3 |
| Gallup | 4–25 Nov 2003 | 2,032 | 23.6 | 23.5 | 4.8 | 0.7 | 1.4 | – | – | – | 24.5 | 18.5 | 0.1 |
| ASEP | 10–15 Nov 2003 | 1,205 | 27.6 | 25.8 | 4.5 | 4.7* | * | ** | * | 3.0** | 19.7 | 9.5 | 1.8 |
| CIS | 25–31 Oct 2003 | 2,488 | 27.5 | 24.4 | 3.7 | 2.2 | 0.6 | 0.5 | 0.6 | 0.8 | 24.5 | 9.3 | 3.1 |
| Gallup | 3–22 Oct 2003 | 2,016 | 23.2 | 23.4 | 4.2 | 1.1 | 2.5 | – | – | – | 25.4 | 17.6 | 0.2 |
| ASEP | 13–18 Oct 2003 | 1,205 | 27.7 | 28.1 | 4.6 | 5.2* | * | ** | * | 2.2** | 18.4 | 8.7 | 0.4 |
| Vox Pública/El Periódico | 22–24 Sep 2003 | 1,502 | 35.9 | 29.8 | 3.6 | 1.7 | 1.2 | – | – | – | 13.4 | 6.9 | 6.1 |
| Gallup | 1–24 Sep 2003 | 2,027 | 24.6 | 22.6 | 4.9 | 1.0 | 1.7 | – | – | – | 27.2 | 14.8 | 2.0 |
| ASEP | 15–20 Sep 2003 | 1,214 | 27.5 | 33.5 | 3.1 | 4.5* | * | ** | * | 1.5** | 17.8 | 8.3 | 6.0 |
| Gallup | 1–18 Aug 2003 | 2,026 | 22.5 | 24.8 | 3.5 | 1.2 | 1.7 | – | – | – | 28.4 | 15.1 | 2.3 |
| Gallup | 1–24 Jul 2003 | 2,032 | 23.4 | 26.0 | 4.0 | 0.8 | 1.3 | – | – | – | 22.3 | 18.9 | 2.6 |
| CIS | 2–8 Jul 2003 | 2,476 | 25.2 | 26.1 | 4.9 | 2.4 | 0.8 | 0.7 | 0.3 | 1.2 | 22.5 | 9.6 | 0.9 |
| ASEP | 30 Jun–5 Jul 2003 | 1,212 | 27.6 | 30.4 | 5.3 | 4.3* | * | ** | * | 2.7** | 14.8 | 10.9 | 2.8 |
| Vox Pública/El Periódico | 23–25 Jun 2003 | 1,502 | 31.0 | 30.3 | 5.4 | 1.3 | 0.9 | – | – | – | 14.4 | 6.6 | 0.7 |
| Gallup | 2–20 Jun 2003 | 2,024 | 26.6 | 24.3 | 5.0 | 0.5 | 0.7 | – | – | – | 23.9 | 15.0 | 2.3 |
| ASEP | 2–7 Jun 2003 | 1,215 | 27.7 | 30.0 | 4.8 | 5.6* | * | ** | * | 3.0** | 17.1 | 8.6 | 2.3 |
| Gallup | 5–26 May 2003 | 2,026 | 19.2 | 27.5 | 4.4 | 0.6 | 0.7 | – | – | – | 28.1 | 14.0 | 8.3 |
| ASEP | 5–10 May 2003 | 1,210 | 25.4 | 30.9 | 5.1 | 4.3* | * | ** | * | 1.6** | 19.6 | 8.4 | 5.5 |
| CIS | 24–30 Apr 2003 | 2,494 | 21.8 | 27.4 | 4.3 | 2.0 | 1.3 | 0.6 | 0.4 | 0.8 | 26.1 | 8.6 | 5.6 |
| Gallup | 1–22 Apr 2003 | 2,020 | 16.4 | 28.7 | 3.7 | 0.7 | 0.8 | – | – | – | 29.4 | 16.3 | 12.3 |
| ASEP | 7–12 Apr 2003 | 1,205 | 18.6 | 34.5 | 4.2 | 4.7* | * | ** | * | 2.4** | 20.9 | 9.1 | 15.9 |
| Vox Pública/El Periódico | 31 Mar–2 Apr 2003 | 1,503 | 20.4 | 33.7 | 4.1 | 2.3 | 0.9 | – | – | – | 17.4 | 9.8 | 13.3 |
| Gallup | 3–25 Mar 2003 | 2,016 | 18.4 | 30.1 | 3.2 | 0.9 | 0.7 | – | – | – | 24.8 | 19.0 | 11.7 |
| ASEP | 10–16 Mar 2003 | 1,210 | 22.7 | 32.5 | 3.3 | 5.1* | * | ** | * | 2.2** | 18.4 | 10.2 | 9.8 |
| Gallup | 3–24 Feb 2003 | 2,028 | 18.2 | 26.9 | 4.3 | 1.1 | 1.5 | – | – | – | 25.2 | 20.0 | 8.7 |
| ASEP | 10–15 Feb 2003 | 1,209 | 24.4 | 32.4 | 3.8 | 4.7* | * | ** | * | 2.3** | 18.2 | 9.7 | 8.0 |
| CIS | 21–26 Jan 2003 | 2,480 | 23.2 | 24.4 | 3.4 | 2.4 | 1.4 | 0.7 | 0.3 | 0.9 | 25.3 | 11.7 | 1.2 |
| Gallup | 7–23 Jan 2003 | 2,034 | 20.0 | 27.3 | 3.6 | 0.7 | 1.9 | – | – | – | 23.8 | 18.9 | 7.3 |
| ASEP | 13–18 Jan 2003 | 1,215 | 23.5 | 28.2 | 4.2 | 5.0* | * | ** | * | 2.5** | 20.5 | 11.4 | 4.7 |
| Vox Pública/El Periódico | 13–16 Jan 2003 | 1,501 | 27.8 | 27.6 | 4.0 | 1.6 | 0.9 | – | – | – | 18.8 | 9.6 | 0.2 |
| Gallup | 2–23 Dec 2002 | 2,011 | 17.6 | 25.3 | 3.1 | 0.8 | 1.1 | – | – | – | 29.6 | 18.3 | 7.7 |
| ASEP | 2–8 Dec 2002 | 1,210 | 22.4 | 30.8 | 3.6 | 5.3* | * | ** | * | 3.5** | 17.3 | 12.1 | 8.4 |
| Gallup | 4–25 Nov 2002 | 2,018 | 20.6 | 25.1 | 4.1 | 0.7 | 0.7 | – | – | – | 25.6 | 19.2 | 4.5 |
| ASEP | 4–9 Nov 2002 | 1,202 | 22.8 | 31.8 | 4.0 | 4.0* | * | ** | * | 2.5** | 18.6 | 10.9 | 9.0 |
| Gallup | 1–24 Oct 2002 | 2,018 | 19.0 | 25.4 | 3.7 | 1.1 | 1.1 | – | – | – | 27.5 | 19.4 | 6.4 |
| CIS | 16–21 Oct 2002 | 2,489 | 24.5 | 25.2 | 2.9 | 2.2 | 0.8 | 0.4 | 0.3 | 1.2 | 25.3 | 11.5 | 0.7 |
| ASEP | 7–13 Oct 2002 | 1,208 | 27.7 | 24.7 | 4.5 | 4.4* | * | ** | * | 2.0** | 19.6 | 11.5 | 3.0 |
| Vox Pública/El Periódico | 7–9 Oct 2002 | 1,507 | 29.5 | 25.8 | 3.2 | 1.7 | 1.3 | – | – | – | 21.1 | 8.6 | 3.7 |
| CIS | 9 Sep–9 Oct 2002 | 10,476 | 23.1 | 26.3 | 3.5 | 2.5 | 1.1 | 0.5 | 0.4 | 1.1 | 26.1 | 10.3 | 3.2 |
| ASEP | 9–15 Sep 2002 | 1,212 | 25.4 | 27.6 | 4.8 | 5.8* | * | ** | * | 2.3** | 18.1 | 11.5 | 2.2 |
| Gallup | 1–23 Aug 2002 | 2,008 | 20.8 | 25.3 | 4.2 | 0.5 | 0.9 | – | – | – | 25.5 | 20.1 | 4.5 |
| Gallup | 2–29 Jul 2002 | 2,013 | 22.4 | 26.2 | 3.0 | 0.8 | 0.6 | – | – | – | 23.5 | 20.7 | 3.8 |
| CIS | 16–21 Jul 2002 | 2,482 | 25.4 | 24.0 | 2.9 | 2.0 | 0.8 | 0.7 | 0.3 | 0.6 | 26.2 | 11.8 | 1.4 |
| ASEP | 8–14 Jul 2002 | 1,212 | 26.0 | 29.8 | 4.8 | 5.7* | * | ** | * | 2.3** | 16.3 | 10.5 | 3.8 |
| Vox Pública/El Periódico | 24–26 Jun 2002 | 1,504 | 25.8 | 28.1 | 3.5 | 1.6 | 1.0 | – | – | – | 19.4 | 11.6 | 2.3 |
| Gallup | 1–24 Jun 2002 | 2,016 | 23.2 | 21.6 | 4.0 | 1.0 | 0.6 | – | – | – | 24.8 | 21.6 | 1.6 |
| ASEP | 10–16 Jun 2002 | 1,222 | 26.7 | 24.2 | 4.9 | 5.0* | * | ** | * | 1.9** | 18.9 | 13.3 | 2.5 |
| Gallup | 3–22 May 2002 | 2,010 | 25.1 | 25.4 | 3.5 | 0.8 | 1.1 | – | – | – | 22.3 | 19.0 | 0.3 |
| ASEP | 9–17 May 2002 | 1,209 | 29.6 | 25.4 | 3.6 | 4.7* | * | ** | * | 1.1** | 17.7 | 12.0 | 4.2 |
| Gallup | 1–23 Apr 2002 | 2,017 | 22.0 | 25.3 | 3.1 | 1.2 | 0.7 | – | – | – | 25.0 | 19.5 | 3.3 |
| CIS | 16–21 Apr 2002 | 2,498 | 26.8 | 20.9 | 3.6 | 2.5 | 0.8 | 0.5 | 0.3 | 0.7 | 25.6 | 12.5 | 5.9 |
| Vox Pública/El Periódico | 15–17 Apr 2002 | 1,510 | 27.5 | 24.8 | 4.0 | 2.1 | 1.2 | – | – | – | 20.3 | 10.9 | 2.7 |
| ASEP | 8–14 Apr 2002 | 1,216 | 28.7 | 25.9 | 3.7 | 4.4* | * | ** | * | 1.1** | 17.8 | 13.8 | 2.8 |
| Gallup | 4–27 Mar 2002 | 2,029 | 21.0 | 22.2 | 3.5 | 0.5 | 0.8 | – | – | – | 29.3 | 20.0 | 1.2 |
| ASEP | 11–17 Mar 2002 | 1,220 | 28.9 | 26.2 | 4.0 | 4.1* | * | ** | * | 2.4** | 17.3 | 12.2 | 2.7 |
| Gallup | 4–27 Feb 2002 | 2,030 | 23.3 | 23.5 | 4.2 | 0.9 | 0.9 | – | – | – | 25.3 | 18.6 | 0.2 |
| ASEP | 11–17 Feb 2002 | 1,214 | 27.9 | 28.5 | 3.0 | 4.8* | * | ** | * | 2.0** | 17.0 | 13.3 | 0.6 |
| Vox Pública/El Periódico | 4–5 Feb 2002 | 1,506 | 29.4 | 27.8 | 2.8 | 2.1 | 1.7 | – | – | – | 18.9 | 9.9 | 1.6 |
| CIS | 27–31 Jan 2002 | 2,498 | 29.2 | 20.7 | 3.8 | 2.2 | 0.8 | 0.6 | 0.3 | 0.8 | 26.1 | 10.4 | 8.5 |
| Gallup | 4–29 Jan 2002 | 2,031 | 26.5 | 21.3 | 3.2 | 0.7 | 1.3 | – | – | – | 25.6 | 18.0 | 5.2 |
| ASEP | 14–19 Jan 2002 | 1,224 | 29.8 | 26.5 | 3.9 | 4.9* | * | ** | * | 1.9** | 17.3 | 11.0 | 3.3 |
| Gallup | 3–28 Dec 2001 | 2,020 | 21.5 | 26.2 | 3.7 | 0.9 | 0.8 | – | – | – | 26.5 | 16.6 | 4.7 |
| ASEP | 10–15 Dec 2001 | 1,210 | 26.3 | 25.5 | 4.6 | 4.9* | * | ** | * | 1.7** | 17.9 | 12.4 | 0.8 |
| Gallup | 2–28 Nov 2001 | 2,021 | 24.1 | 22.2 | 3.6 | 0.8 | 1.0 | – | – | – | 28.7 | 17.0 | 1.9 |
| ASEP | 12–17 Nov 2001 | 1,209 | 31.3 | 23.2 | 3.4 | 4.8* | * | ** | * | 1.8** | 18.8 | 11.5 | 8.1 |
| Gallup | 1–30 Oct 2001 | 2,016 | 24.6 | 23.3 | 2.7 | 1.4 | 1.8 | – | – | – | 27.1 | 16.4 | 1.3 |
| CIS | 24–29 Oct 2001 | 2,499 | 26.8 | 22.4 | 3.5 | 3.2 | 1.2 | 0.6 | 0.5 | 1.1 | 24.0 | 11.2 | 4.4 |
| Vox Pública/El Periódico | 22–23 Oct 2001 | 1,509 | 33.2 | 27.3 | 4.2 | 2.0 | 1.1 | – | – | – | 17.5 | 8.4 | 5.9 |
| ASEP | 15–20 Oct 2001 | 1,212 | 29.7 | 23.7 | 4.7 | 5.2* | * | ** | * | 2.0** | 19.6 | 11.7 | 6.0 |
| Gallup | 6–27 Sep 2001 | 2,027 | 22.7 | 22.7 | 3.3 | 1.9 | 1.7 | – | – | – | 27.0 | 17.2 | Tie |
| ASEP | 17–22 Sep 2001 | 1,210 | 28.3 | 22.7 | 4.8 | 4.9* | * | ** | * | 1.5** | 21.5 | 11.0 | 5.6 |
| Gallup | 2–30 Jul 2001 | 2,024 | 23.7 | 22.0 | 3.6 | 0.8 | 1.7 | – | – | – | 21.7 | 18.0 | 1.7 |
| CIS | 13–18 Jul 2001 | 2,485 | 27.8 | 24.1 | 3.5 | 2.7 | 1.1 | 0.8 | 0.2 | 0.8 | 23.5 | 11.2 | 3.7 |
| ASEP | 9–14 Jul 2001 | 1,210 | 25.9 | 27.2 | 4.0 | 5.3* | * | ** | * | 2.9** | 16.2 | 12.8 | 1.3 |
| Vox Pública/El Periódico | 25–28 Jun 2001 | 1,506 | 31.1 | 27.0 | 4.2 | 1.3 | 1.0 | – | – | – | 16.7 | 10.2 | 4.1 |
| Gallup | 6–27 Jun 2001 | 2,008 | 24.9 | 24.7 | 3.3 | 1.9 | 1.7 | – | – | – | 23.4 | 16.8 | 0.2 |
| ASEP | 11–16 Jun 2001 | 1,213 | 26.4 | 26.6 | 4.0 | 4.8* | * | ** | * | 1.6** | 20.8 | 10.1 | 0.2 |
| Gallup | 4–25 May 2001 | 2,031 | 23.8 | 22.3 | 3.3 | 1.4 | 0.6 | – | – | – | 31.1 | 14.8 | 1.5 |
| ASEP | 11–19 May 2001 | 1,214 | 28.7 | 22.4 | 5.6 | 5.6* | * | ** | * | 2.1** | 20.0 | 10.4 | 6.3 |
| CIS | 20–30 Apr 2001 | 2,492 | 27.6 | 21.7 | 3.3 | 2.9 | 0.9 | 0.8 | 0.5 | 1.1 | 25.8 | 10.3 | 5.9 |
| Gallup | 4–25 Apr 2001 | 2,026 | 24.2 | 22.0 | 3.7 | 0.7 | 1.0 | – | – | – | 28.8 | 14.8 | 2.2 |
| ASEP | 16–21 Apr 2001 | 1,209 | 29.6 | 26.3 | 4.2 | 4.5* | * | ** | * | 2.2** | 18.7 | 10.7 | 3.3 |
| Vox Pública/El Periódico | 16–18 Apr 2001 | 1,514 | 31.5 | 26.7 | 2.9 | 2.2 | 1.0 | – | – | – | 19.5 | 8.9 | 4.8 |
| Gallup | 5–30 Mar 2001 | 2,026 | 24.7 | 22.9 | 3.4 | 0.9 | 0.9 | – | – | – | 29.4 | 16.5 | 1.8 |
| ASEP | 12–17 Mar 2001 | 1,205 | 27.9 | 26.4 | 5.7 | 5.0* | * | ** | * | 3.2** | 16.2 | 11.3 | 1.5 |
| Gallup | 1–26 Feb 2001 | 2,036 | 22.9 | 21.3 | 3.8 | 1.3 | 1.2 | – | – | – | 29.4 | 16.5 | 1.6 |
| ASEP | 12–17 Feb 2001 | 1,212 | 30.2 | 25.7 | 3.8 | 4.9* | * | ** | * | 2.5** | 18.3 | 10.8 | 4.5 |
| Vox Pública/El Periódico | 29–31 Jan 2001 | 1,519 | 29.6 | 26.7 | 3.1 | 1.8 | 1.2 | – | – | – | 20.0 | 9.3 | 2.9 |
| Gallup | 8–27 Jan 2001 | 2,028 | 22.7 | 25.4 | 3.0 | 1.9 | 1.0 | – | – | – | 28.2 | 14.4 | 2.7 |
| CIS | 18–23 Jan 2001 | 2,486 | 27.2 | 23.3 | 3.3 | 2.5 | 1.0 | 0.5 | 0.4 | 0.5 | 24.5 | 11.7 | 3.9 |
| ASEP | 15–20 Jan 2001 | 1,211 | 26.1 | 28.0 | 4.2 | 6.8* | * | ** | * | 2.2** | 18.2 | 10.1 | 1.9 |
| ASEP | 11–16 Dec 2000 | 1,210 | 28.0 | 26.9 | 5.0 | 5.0* | * | ** | * | 2.5** | 16.6 | 11.0 | 1.1 |
| ASEP | 6–11 Nov 2000 | 1,210 | 30.1 | 25.8 | 4.5 | 4.5* | * | ** | * | 1.7** | 19.1 | 10.1 | 4.3 |
| Vox Pública/El Periódico | 30–31 Oct 2000 | 1,210 | 34.6 | 26.0 | 3.4 | 2.9 | 1.0 | – | – | – | 16.2 | 9.2 | 8.6 |
| CIS | 17–22 Oct 2000 | 2,497 | 30.2 | 22.1 | 3.6 | 2.7 | 1.2 | 0.7 | 0.4 | 1.1 | 24.6 | 9.5 | 8.1 |
| ASEP | 9–16 Oct 2000 | 1,212 | 29.7 | 26.4 | 4.2 | 4.5* | * | ** | * | 2.1** | 18.6 | 10.4 | 3.3 |
| Demoscopia/El País | 9 Oct 2000 | ? | 27.9 | 21.7 | 4.2 | 2.7 | – | – | – | – | 23.7 | 13.7 | 6.2 |
| Gallup | 1–27 Sep 2000 | 2,025 | 25.1 | 20.8 | 3.8 | 1.4 | 0.3 | – | – | – | 30.8 | 13.6 | 4.3 |
| ASEP | 11–16 Sep 2000 | 1,214 | 31.9 | 22.6 | 5.4 | 5.2* | * | ** | * | 2.6** | 17.6 | 10.2 | 9.3 |
| CIS | 13–18 Jul 2000 | 2,493 | 32.5 | 17.1 | 3.6 | 2.8 | 0.9 | 0.6 | 0.2 | 0.8 | 24.5 | 11.5 | 15.4 |
| ASEP | 3–8 Jul 2000 | 1,218 | 37.4 | 23.4 | 4.8 | 5.7* | * | ** | * | 2.7** | 15.6 | 7.7 | 14.0 |
| Vox Pública/El Periódico | 26–30 Jun 2000 | 2,300 | 39.0 | 19.1 | 5.4 | 3.0 | 1.0 | – | – | – | 14.8 | 9.3 | 19.9 |
| ASEP | 5–10 Jun 2000 | 1,211 | 36.9 | 21.8 | 5.1 | 5.7* | * | ** | * | 2.6** | 14.8 | 10.0 | 15.1 |
| ASEP | 8–13 May 2000 | 1,221 | 37.0 | 23.2 | 5.2 | 5.8* | * | ** | * | 1.7** | 14.9 | 8.5 | 13.8 |
| CIS | 29 Apr–3 May 2000 | 2,491 | 34.1 | 15.9 | 4.4 | 3.2 | 0.8 | 0.8 | 0.6 | 1.3 | 21.8 | 10.9 | 18.2 |
| ASEP | 10–15 Apr 2000 | 1,210 | 36.2 | 22.2 | 4.3 | 6.9* | * | ** | * | 2.6** | 14.0 | 9.1 | 14.0 |
| ASEP | 13–20 Mar 2000 | 1,208 | 36.3 | 21.5 | 5.1 | 7.0* | * | ** | * | 2.7** | 14.6 | 8.8 | 14.8 |
| 2000 general election | 12 Mar 2000 | — | 31.0 | 23.7 | 3.8 | 2.9 | 1.1 | 0.9 | 0.7 | 0.6 | — | 30.0 | 7.3 |
| (*) Includes data for CiU, PNV, EA, PAR, UPN, PA, UV, EU and CC. (**) Includes data for ERC, BNG and CHA. ||||||||||||||

#### Victory preference

The table below lists opinion polling on the victory preferences for each party in the event of a general election taking place.
| Polling firm/Commissioner | Fieldwork date | Sample size | | | | | PNV | Other/ None | ? | Lead |
| Opina/Cadena SER | 7 Mar 2004 | ? | 35.7 | 41.2 | – | – | – | 8.0 | 15.1 | 5.5 |
| Opina/Cadena SER | 6 Mar 2004 | ? | 35.9 | 40.0 | – | – | – | 8.1 | 16.0 | 4.1 |
| Opina/Cadena SER | 5 Mar 2004 | ? | 35.6 | 40.1 | – | – | – | 7.9 | 16.3 | 4.5 |
| Opina/Cadena SER | 4 Mar 2004 | ? | 36.6 | 39.1 | – | – | – | 8.4 | 15.8 | 2.5 |
| Opina/Cadena SER | 3 Mar 2004 | ? | 37.2 | 39.0 | – | – | – | 8.0 | 15.8 | 1.8 |
| Noxa/La Vanguardia | 27 Feb–3 Mar 2004 | 2,200 | 36.3 | 42.0 | – | – | – | – | – | 5.7 |
| Opina/Cadena SER | 2 Mar 2004 | ? | 37.0 | 38.4 | – | – | – | 8.8 | 15.8 | 1.4 |
| Opina/Cadena SER | 1 Mar 2004 | ? | 36.5 | 38.6 | – | – | – | 9.1 | 15.8 | 2.1 |
| Opina/El País | 27 Feb–1 Mar 2004 | 4,000 | 33.7 | 38.3 | – | – | – | 4.1 | 24.1 | 4.6 |
| Opina/Cadena SER | 29 Feb 2004 | ? | 37.2 | 37.6 | – | – | – | 10.3 | 14.9 | 0.4 |
| Opina/Cadena SER | 28 Feb 2004 | ? | 37.6 | 36.9 | – | – | – | 10.3 | 15.3 | 0.7 |
| Opina/Cadena SER | 27 Feb 2004 | ? | 38.1 | 36.4 | – | – | – | 9.7 | 15.8 | 1.7 |
| Opina/Cadena SER | 26 Feb 2004 | 3,000 | 37.4 | 37.5 | – | – | – | 8.3 | 16.9 | 0.1 |
| CIS | 24 Jan–15 Feb 2004 | 24,109 | 32.1 | 34.0 | 4.7 | 1.2 | 0.6 | 10.0 | 17.5 | 1.9 |
| Opina/Cadena SER | 11 Feb 2004 | 1,000 | 36.6 | 39.9 | – | – | – | 8.1 | 15.4 | 3.3 |
| Opina/Cadena SER | 31 Jan 2004 | 1,000 | 37.5 | 38.5 | – | – | – | 5.6 | 18.4 | 1.0 |
| Opina/El País | 25 Jan 2004 | 3,000 | 36.6 | 35.5 | – | – | – | 6.0 | 21.9 | 1.1 |
| Opina/Cadena SER | 16 Jan 2004 | 1,000 | 39.4 | 38.2 | – | – | – | 8.2 | 14.2 | 1.2 |
| Opina/Cadena SER | 2 Jan 2004 | ? | 37.1 | 39.2 | – | – | – | 5.3 | 18.4 | 2.1 |
| Opina/Cadena SER | 19 Nov 2003 | 1,000 | 36.5 | 38.2 | – | – | – | 4.6 | 20.7 | 1.7 |
| Opina/Cadena SER | 24 Sep 2003 | 1,000 | 36.8 | 36.6 | – | – | – | 6.5 | 20.1 | 0.2 |
| Opina/Cadena SER | 10 Sep 2003 | 1,000 | 39.0 | 36.5 | – | – | – | 4.6 | 19.9 | 2.5 |
| Opina/Cadena SER | 2 Sep 2003 | 1,000 | 38.9 | 36.2 | – | – | – | 6.1 | 18.8 | 2.7 |
| Opina/Cadena SER | 27 Aug 2003 | 1,000 | 36.7 | 39.1 | – | – | – | 5.1 | 19.1 | 2.4 |
| Opina/Cadena SER | 11 Jun 2003 | ? | 37.4 | 40.1 | – | – | – | 5.0 | 17.5 | 2.7 |
| Opina/Cadena SER | 28 May 2003 | ? | 37.1 | 42.2 | – | – | – | 2.7 | 18.0 | 5.1 |
| Opina/Cadena SER | 15 May 2003 | 1,000 | 35.6 | 39.8 | – | – | – | 4.0 | 20.6 | 4.2 |
| Noxa/La Vanguardia | 22–24 Apr 2003 | 1,000 | 37.0 | 40.0 | 5.0 | 2.0 | 1.0 | 10.0 | 6.0 | 3.0 |
| Opina/Cadena SER | 23 Apr 2003 | 1,000 | 29.3 | 41.6 | – | – | – | 3.6 | 25.5 | 12.3 |
| Opina/Cadena SER | 2 Apr 2003 | ? | 27.1 | 49.4 | – | – | – | 3.6 | 19.9 | 22.3 |
| Opina/Cadena SER | 21 Mar 2003 | 1,000 | 25.9 | 44.1 | – | – | – | 4.5 | 25.5 | 18.2 |
| Opina/Cadena SER | 8 Mar 2003 | 1,000 | 26.2 | 46.7 | – | – | – | 3.5 | 23.6 | 20.5 |
| Opina/Cadena SER | 19 Feb 2003 | 1,000 | 27.8 | 44.1 | – | – | – | 3.5 | 24.6 | 16.3 |
| Opina/Cadena SER | 6 Feb 2003 | ? | 28.2 | 43.6 | – | – | – | 3.6 | 24.6 | 15.4 |
| Opina/Cadena SER | 22 Jan 2003 | 1,000 | 28.6 | 41.8 | – | – | – | 3.3 | 26.3 | 13.2 |
| Opina/Cadena SER | 8 Jan 2003 | 1,000 | 31.9 | 40.1 | – | – | – | 2.3 | 25.7 | 8.2 |
| Opina/Cadena SER | 17 Dec 2002 | 1,000 | 29.8 | 39.3 | – | – | – | 3.8 | 27.1 | 9.5 |
| Opina/Cadena SER | 4 Dec 2002 | 1,000 | 30.7 | 41.4 | – | – | – | 3.5 | 24.4 | 8.2 |
| Opina/Cadena SER | 20 Nov 2002 | 1,000 | 33.0 | 38.7 | – | – | – | 2.8 | 25.5 | 5.7 |
| Opina/Cadena SER | 6 Nov 2002 | 1,000 | 31.4 | 42.3 | – | – | – | 1.4 | 24.9 | 10.9 |
| Opina/Cadena SER | 23 Oct 2002 | 1,000 | 30.6 | 37.6 | – | – | – | 3.1 | 27.7 | 7.0 |

#### Victory likelihood

The table below lists opinion polling on the perceived likelihood of victory for each party in the event of a general election taking place.
| Polling firm/Commissioner | Fieldwork date | Sample size | | | Other/ None | ? | Lead |
| Opina/Cadena SER | 7 Mar 2004 | ? | 70.3 | 12.6 | 0.6 | 16.5 | 57.7 |
| Opina/Cadena SER | 6 Mar 2004 | ? | 70.1 | 12.8 | 0.7 | 16.3 | 57.3 |
| Opina/Cadena SER | 5 Mar 2004 | ? | 68.1 | 12.8 | 0.8 | 18.2 | 55.3 |
| Opina/Cadena SER | 4 Mar 2004 | ? | 68.2 | 12.9 | 0.9 | 17.9 | 55.3 |
| Opina/Cadena SER | 3 Mar 2004 | ? | 67.8 | 12.2 | 0.9 | 19.2 | 55.6 |
| Opina/Cadena SER | 2 Mar 2004 | ? | 68.5 | 11.8 | 0.8 | 18.9 | 56.7 |
| Opina/Cadena SER | 1 Mar 2004 | ? | 67.8 | 12.1 | 0.9 | 19.2 | 55.7 |
| Opina/El País | 27 Feb–1 Mar 2004 | 4,000 | 66.2 | 11.4 | 0.3 | 22.2 | 54.8 |
| Opina/Cadena SER | 29 Feb 2004 | ? | 67.7 | 13.2 | 1.1 | 17.9 | 54.5 |
| Opina/Cadena SER | 28 Feb 2004 | ? | 67.2 | 13.9 | 1.2 | 17.6 | 53.3 |
| Opina/Cadena SER | 27 Feb 2004 | ? | 67.0 | 13.4 | 1.2 | 18.3 | 53.6 |
| Opina/Cadena SER | 26 Feb 2004 | 3,000 | 66.9 | 13.3 | 0.9 | 18.9 | 53.6 |
| Infortécnica | 26 Feb 2004 | 4,656 | 64.5 | 13.7 | 1.0 | 20.7 | 50.8 |
| CIS | 24 Jan–15 Feb 2004 | 24,109 | 63.4 | 11.0 | 1.5 | 24.2 | 52.4 |
| Opina/Cadena SER | 11 Feb 2004 | 1,000 | 70.8 | 12.3 | 0.6 | 16.3 | 58.5 |
| Opina/Cadena SER | 31 Jan 2004 | 1,000 | 70.0 | 13.2 | 0.4 | 16.4 | 56.8 |
| Opina/El País | 25 Jan 2004 | 3,000 | 67.6 | 11.3 | 0.1 | 21.0 | 56.3 |
| Opina/Cadena SER | 16 Jan 2004 | 1,000 | 71.9 | 11.8 | 0.6 | 15.7 | 60.1 |
| Opina/Cadena SER | 2 Jan 2004 | ? | 70.5 | 9.9 | 0.3 | 19.3 | 60.6 |
| Opina/Cadena SER | 19 Nov 2003 | 1,000 | 73.3 | 9.7 | 0.3 | 16.7 | 63.6 |
| Opina/Cadena SER | 24 Sep 2003 | 1,000 | 67.6 | 14.5 | 0.3 | 17.6 | 53.1 |
| Opina/Cadena SER | 10 Sep 2003 | 1,000 | 69.5 | 11.7 | 0.5 | 18.3 | 57.8 |
| Opina/Cadena SER | 2 Sep 2003 | 1,000 | 68.2 | 16.2 | 0.3 | 15.3 | 52.0 |
| Opina/Cadena SER | 27 Aug 2003 | 1,000 | 64.1 | 19.4 | 0.5 | 16.0 | 44.7 |
| Opina/Cadena SER | 11 Jun 2003 | ? | 56.2 | 22.9 | 0.6 | 20.3 | 33.3 |
| Opina/Cadena SER | 28 May 2003 | ? | 53.8 | 26.2 | 0.6 | 19.4 | 27.6 |
| Opina/Cadena SER | 15 May 2003 | 1,000 | 45.2 | 31.8 | 0.5 | 22.5 | 13.4 |
| Noxa/La Vanguardia | 22–24 Apr 2003 | 1,000 | 39.0 | 46.0 | 2.0 | 13.0 | 7.0 |
| Opina/Cadena SER | 23 Apr 2003 | 1,000 | 33.3 | 42.6 | 0.4 | 23.7 | 9.3 |
| Opina/Cadena SER | 2 Apr 2003 | ? | 24.6 | 54.6 | 0.3 | 20.5 | 30.0 |
| Opina/Cadena SER | 21 Mar 2003 | 1,000 | 26.6 | 47.1 | 0.6 | 25.7 | 20.5 |
| Opina/Cadena SER | 8 Mar 2003 | 1,000 | 37.3 | 39.1 | 0.2 | 23.4 | 1.8 |
| Opina/Cadena SER | 19 Feb 2003 | 1,000 | 34.5 | 38.4 | 0.6 | 26.5 | 3.9 |
| Opina/Cadena SER | 6 Feb 2003 | ? | 41.8 | 30.5 | 0.8 | 26.9 | 11.3 |
| Opina/Cadena SER | 22 Jan 2003 | 1,000 | 51.0 | 24.2 | 0.6 | 24.2 | 26.8 |
| Opina/Cadena SER | 8 Jan 2003 | 1,000 | 48.8 | 25.7 | 0.1 | 25.4 | 23.1 |
| Opina/Cadena SER | 17 Dec 2002 | 1,000 | 45.4 | 29.1 | 0.6 | 24.9 | 16.3 |
| Opina/Cadena SER | 4 Dec 2002 | 1,000 | 50.4 | 24.7 | 0.3 | 24.6 | 25.7 |
| Opina/Cadena SER | 20 Nov 2002 | 1,000 | 58.6 | 20.6 | 0.3 | 20.5 | 38.0 |
| Opina/Cadena SER | 6 Nov 2002 | 1,000 | 48.6 | 25.9 | 0.2 | 25.3 | 22.7 |
| Opina/Cadena SER | 23 Oct 2002 | 1,000 | 58.5 | 17.7 | 0.3 | 23.5 | 40.8 |

### Sub-national polling
#### Catalonia

| Polling firm/Commissioner | Fieldwork date | Sample size | Turnout | | | | | | | Lead |
| 2004 general election | 14 Mar 2004 | — | 76.0 | 39.5 21 | 20.8 10 | 15.6 6 | 15.9 8 | 5.8 2 | | 18.7 |
| Vox Pública/El Periódico | 1–3 Mar 2004 | 571 | ? | 37.0 17/19 | 20.6 10/11 | 20.6 10/11 | 13.2 6/7 | 6.0 2 | | 16.4 |
| Noxa/La Vanguardia | 27 Feb–3 Mar 2004 | 700 | ? | 38.0 19/20 | 20.3 10 | 20.8 10 | 11.4 5/6 | 7.4 1/2 | | 17.2 |
| Noxa/La Vanguardia | 6–12 Feb 2004 | 600 | ? | 37.2 18 | 18.2 9 | 22.3 11/12 | 12.7 6/7 | 7.3 2 | | 14.9 |
| ERC | 8–15 Jan 2004 | 2,000 | ? | ? 16/17 | ? 12/14 | ? 9/10 | ? 5/7 | ? 2/3 | – | ? |
| Vox Pública/PSC | 16–18 Dec 2002 | 805 | ? | 42.0– 43.0 | 20.5– 21.5 | 20.0– 21.0 | 6.5– 7.5 | 4.5– 5.5 | | 21.5 |
| Vox Pública/El Periódico | 7–9 Oct 2002 | ? | ? | 39.5 | 22.5 | 22.0 | – | – | – | 17.0 |
| CIS | 9 Sep–9 Oct 2002 | 922 | 76.2 | 36.4 | 25.1 | 20.6 | 7.7 | 5.3 | – | 11.3 |
| Opina/La Vanguardia | 6 Nov 2000 | 800 | ? | 36.0 | 26.5 | 21.0 | 7.5 | 4.0 | – | 9.5 |
| Vox Pública/El Periódico | 26–30 Jun 2000 | 801 | ? | 30.0 | 26.5 | 28.0 | 5.1 | 3.3 | 3.5 | 2.0 |
| 2000 general election | 12 Mar 2000 | — | 64.0 | 34.1 17 | 28.8 15 | 22.8 12 | 5.6 1 | 3.5 1 | 2.2 0 | 5.3 |