Single-member constituencies:

•  

  (Red) First past the post (FPTP)
  • American Samoa
  • Anguilla
  • Antigua and Barbuda
  • Azerbaijan
  • Bahamas
  • Bangladesh
  • Barbados
  • Belarus
  • Belize
  • Bermuda
  • Bhutan
  • Botswana
  • Canada
  • Cook Islands
  • Dominica
  • Dominican Republic
  • Eritrea
  • Ethiopia
  • Gambia
  • Ghana
  • Grenada
  • Guam
  • Jamaica
  • India
  • Kenya
  • Liberia
  • St. Lucia
  • Madagascar
  • Malawi
  • Malaysia
  • Maldives
  • Micronesia, Federated States of
  • Myanmar
  • Northern Mariana Islands
  • Nigeria
  • Niue
  • Sierra Leone
  • St. Kitts and Nevis
  • North Korea
  • Palau
  • Pakistan
  • Qatar
  • Solomon Islands
  • Eswatini (Swaziland)
  • Trinidad and Tobago
  • Turks and Caicos Islands
  • Uganda
  • United Kingdom
  • St. Vincent and the Grenadines
  • British Virgin Islands
  • Yemen
  • Zambia
•  

  (Maroon) Two-round system (TRS)
  • Bahrain
  • Central African Republic
  • Comoros
  • R. Congo
  • Cuba
  • France
  • French Guiana
  • Gabon
  • Haiti
  • Kiribati
  • Mali
  • Mayotte
  • Montserrat
  • Saint Martin (French part)
  • St. Pierre and Miquelon
  • Turkmenistan
  • Uzbekistan
  • Vietnam

(Puce)

•  

  (Puce)(Persian rose) Instant-runoff voting (IRV)
  • Australia
  • Papua New Guinea

Multi-member constituencies, majoritarian:

•  

  (Orange) Block voting (BV) or mixed FPTP and BV
  • Cayman Islands
  • Guernsey
  • Gibraltar
  • Iran (two round block voting)
  • Falkland Islands
  • St. Helena, Ascension and Tristan da Cunha
  • Jersey
  • Kuwait
  • Laos
  • Lebanon
  • Marshall Islands
  • Mauritius
  • Mongolia
  • Oman
  • Pitcairn Islands
  • Samoa
  • Tonga
  • Tuvalu
  • U.S. Virgin Islands
•  

  (Brown) Party block voting (PBV) or mixed FPTP and PBV
  • Cameroon
  • Chad
  • China
  • Côte d'Ivoire
  • Singapore
  • Syria
•  

  (Yellow) Single non-transferable vote (SNTV) or mixed FPTP and SNTV
  • Iraq
  • Isle of Man
  • Jordan
  • Vanuatu
•  

  (Citron) Modified cumulative voting
  • Norfolk Island
•  

  (Lime) Modified Borda count
  • Nauru

Multi-member constituencies, proportional:

•  

  (blue) unused
•  

  (Light blue) Party-list proportional representation (party-list PR)
  • Albania
  • Algeria
  • Angola
  • Argentina
  • Armenia
  • Aruba
  • Austria
  • Belgium
  • Benin
  • Bosnia and Herzegovina
  • Brazil
  • Bulgaria
  • Burkina Faso
  • Burundi
  • Cabo Verde
  • Curaçao
  • Cambodia
  • Chile
  • Colombia
  • Costa Rica
  • Croatia
  • Cyprus
  • Czech Republic
  • Denmark
  • Ecuador
  • El Salvador
  • Sint Maarten (Dutch part)
  • Equatorial Guinea
  • Estonia
  • Faroe Islands
  • Fiji
  • Finland
  • French Polynesia
  • Greenland
  • Guatemala
  • Guinea-Bissau
  • Guyana
  • Honduras
  • Iceland
  • Indonesia
  • Israel
  • Kazakhstan
  • Latvia
  • Liechtenstein
  • Luxembourg
  • Macedonia
  • Moldova
  • Montenegro
  • Morocco
  • Mozambique
  • Namibia
  • Netherlands
  • New Caledonia
  • Nicaragua
  • Niger
  • Norway
  • Panama
  • Paraguay
  • Peru
  • Poland
  • Portugal
  • Romania
  • Rwanda
  • São Tomé and Príncipe
  • Serbia
  • Sint Maarten
  • Slovakia
  • Slovenia
  • South Africa
  • Spain
  • Sri Lanka
  • Suriname
  • Sweden
  • Switzerland
  • Timor-Leste
  • Togo
  • Tunisia
  • Turkey
  • Uruguay
  • Wallis and Futuna
•  

  Party-list proportional representation (party-list PR)
  (unused, later for open lists)
•  

  Party-list proportional representation (party-list PR)
  (unused, later for open lists)
•  

  Party-list proportional representation (party-list PR)
  (unused, later for open lists)
•  

  (Mint) Single transferable vote
  • Ireland
  • Malta

Mixed majoritarian and proportional:

•  

  (Dark blue) Mixed-member proportional representation (party-list PR and FPTP)
  • Germany
  • New Zealand
•  

  (Purple)AMS (semi-proportional implementation of of MMP))
  • Bolivia (single vote MMP)
  • Lesotho (single vote MMP)

•  

  (Dark pink) Parallel voting / mixed member majoritarian (party-list PR and FPTP)
  • D. R. Congo
  • Guinea
  • Italy
  • Japan
  • Kyrgyzstan
  • Libya
  • Nepal
  • Philippines
  • Puerto Rico
  • Russia
  • Seychelles
  • South Sudan
  • Taiwan
  • Tanzania
  • Thailand
  • Ukraine
  • Venezuela
  • Zimbabwe

•  

  (Dark magenta) Parallel voting (party-list PR and TRS)
  • Egypt
  • Lithuania
  • Tajikistan
  • Georgia

•  

  (Fuchsia) Parallel voting (party-list PR and BV or PBV)
  • Andorra
  • Mauritania
  • Monaco
  • Senegal
  • State of Palestine
  • Sudan

•  

  Parallel voting (party-list PR and SNTV)
• unused for lower chambers, used for Japan upper house
•  

  (Light deep pink) unused

•  

  (Lavender) Partially compensatory: parallel voting + PVT or AMS hybrid (party-list PR and FPTP)
  • Hungary
  • Mexico
  • South Korea

•  

  (Dark blue) Majority jackpot system
  -
  • Armenia
  • Djibouti
  • San Marino
•  

  (color?) Majority bonus system (MBS)
  • Greece

•  

  ( unused (fomerly:Varies by State)

No relevant electoral system information:

•  

  (Black) No elections
  • Afghanistan
  • Brunei
  • Eritrea
  • Saudi Arabia
  • Somalia
  • United Arab Emirates
  • Vatican City
  • Western Sahara

•  

  (Dark grey) Appointed by head of state
  • non for lower houses, used for upper houses

•  

  (Grey) Varies by state
  • United States

•  

  (Light grey) In transition
  • St. Barthélemy
  • Tokelau

•  

  (Light grey) No information
  • Antarctica