| PS | PPD | PCP | CDS | MDP | |
| Total | 37.87% | 26.39% | 12.46% | 7.61% | 4.14% |
| Aveiro | 31.85% | 42.86% | 3.17% | 11.06% | 3.88% |
| Beja | 35.55% | 5.25% | 38.97% | 2.18% | 5.45% |
| Braga | 27.42% | 37.70% | 3.71% | 18.01% | 2.91% |
| Braganca | 24.66% | 43.00% | 2.72% | 13.46% | 3.65% |
| Castell Branco | 41.51% | 24.28% | 5.63% | 6.36% | 3.93% |
| Coimbra | 43.20% | 27.24% | 5.74% | 4.61% | 4.44% |
| Evora | 37.89% | 6.86% | 37.07% | 2.82% | 7.84% |
| Faro | 45,42% | 13.93% | 12.31% | 3.36% | 9.49% |
| Guarda | 28.20% | 33.34% | 2.93% | 19.48% | 3.58% |
| Leiria | 33.19% | 35.97% | 6.43% | 6.76% | 3.40% |
| Lisboa | 45.98% | 14.97% | 18.91% | 4.78% | 4.12% |
| Portalegre | 52.42% | 9.85% | 17.52% | 3.95% | 4.53% |
| Porto | 42.55% | 29.41% | 6.66% | 8.92% | 2.58% |
| Santarem | 42.93% | 18.79% | 15.09% | 4.32% | 4.09% |
| Setubal | 38.15% | 5.73% | 37.79% | 1.55% | 6.03% |
| Viano Do Castelo | 24.45% | 36.02% | 3.81% | 14.61% | 7.06% |
| Vila Real | 27.14% | 45.79% | 2.85% | 7.16% | 2.30% |
| Viseu | 21.47% | 43.78% | 2.29% | 17.19% | 4.04% |
| Acores | 30.39% | 54.81% | 1.48% | 3.09% | 2.71% |
| Madeira | 19.58% | 61.90% | 1.65% | 10.03% | 1.32% |
http://upload.wikimedia.org/wikipedia/en/1/15/Pt_plelection_1975.PNG
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