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All 177 seats in the Chamber of Deputies 89 seats needed for a majority | ||||||||||||||||||||||
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Parliamentary elections were held in Portugal on 11 September 1864.
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| Party | Votes | % | Seats | +/– | |
| Historic Party | 145 | +8 | |||
| Regenerator Party | 32 | –8 | |||
| Total | 177 | 0 | |||
| Total votes | 238,462 | – | |||
| Registered voters/turnout | 350,145 | 68.10 | |||
| Source: ISCSP, Nohlen & Stöver [1] | |||||