Without upper houses
| No Upper House |
|---|
| Albania |
| Angola |
| Armenia |
| Azerbaijan |
| Benin |
| Bulgaria |
| Cap Verde |
| Costa Rica |
| Croatia |
| Cuba |
| Denmark |
| El Salvador |
| Ecuador |
| Estonia |
| Finland |
| Georgia |
| Greece |
| Guatemala |
| Honduras |
| Hungary |
| Iceland |
| Kyrgyzstan |
| Kosovo |
| Laos |
| Latvia |
| Liechtenstein |
| Lithuania |
| Luxembourg |
| Macedonia (FYROM) |
| Moldova |
| Monaco |
| Montenegro |
| Nicaragua |
| Norway |
| Panama |
| Peru |
| Portugal |
| San Marino |
| Serbia |
| Slovakia |
| Sweden |
| Suriname |
| Taiwan |
| Turkmenistan |
| Turkey |
| Ukraine |
| Venezuela |
| Vietnam |
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