Without upper houses
| No Upper House |
|---|
| Armenia |
| Azerbaijan |
| Bulgaria |
| Burkina Faso |
| Cap Verde |
| Croatia |
| Djibouti |
| Finland |
| Georgia |
| Guinea Bissau |
| Guyana |
| Iceland |
| Kyrgyzstan |
| Lithuania |
| Macedonia (FYROM) |
| Mali |
| Mauritania |
| Mongolia |
| Montenegro |
| Niger |
| Palestinian Authority |
| Peru |
| Portugal |
| Sao Tome and Principe |
| Senegal |
| Serbia |
| Slovakia |
| Sri Lanka |
| Taiwan |
| Chad |
| East Timor |
| Togo |
| Ukraine |
| Vanuatu |
| 1 to 40 (35) |