State Duma (Russian Empire) Seats held in Imperial Dumas Seats held in Imperial Dumas

| Party | First_Duma | Second_Duma | Third_Duma | Fourth_Duma_ |
|---|---|---|---|---|
| Russian Social Democratic Party | 18 (Mensheviks) | 47 (Mensheviks) | 19 (Bolsheviks) | 15 (Bolsheviks) |
| Socialist-Revolutionary Party | – | 37 | – | – |
| Labour group | 136 | 104 | 13 | 10 |
| Progressist Party | 27 | 28 | 28 | 41 |
| Constitutional Democratic Party (Kadets) | 179 | 92 | 52 | 57 |
| Non-Russian National Groups | 121 | – | 26 | 21 |
| Centre Party | – | – | – | 33 |
| Octobrist Party | 17 | 42 | 154 | 95 |
| Nationalists | 60 | 93 | 26 | 22 |
| Rightists | 8 | 10 | 147 | 154 |