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Boundary Delimitation
What statistical or other reasons trigger the redrawing of electoral constituency boundaries?
Answers # Countries
% Countries
Country List
total countries/territories: 115
a . Changes in number of total population
26 22.6 %
Benin ,
Côte d'Ivoire ,
Colombia ,
France ,
French Guiana ,
Guadeloupe ,
Hungary ,
India ,
Iran, Islamic Republic of ,
Italy ,
Kenya ,
Lesotho ,
Lithuania ,
Martinique ,
New Caledonia ,
Niger ,
Nepal ,
French Polynesia ,
Papua New Guinea ,
Réunion ,
Sudan ,
Singapore ,
Slovenia ,
Somalia ,
Wallis and Futuna ,
Yemen ,
b . Changes in numbers of eligible voters
6 5.2 %
Colombia ,
Lesotho ,
Niger ,
Singapore ,
Somalia ,
Yemen ,
c . Changes in numbers of registered voters
17 14.7 %
Australia ,
Barbados ,
Bangladesh ,
Belarus ,
Belize ,
Colombia ,
Czech Republic ,
Fiji ,
Croatia ,
Lesotho ,
Macedonia, the Former Yugoslav Republic of ,
Niger ,
Singapore ,
Somalia ,
Ukraine ,
Venezuela ,
Yemen ,
d . Changes in distribution of total population
22 19.1 %
Australia ,
Belize ,
Germany ,
French Guiana ,
Guadeloupe ,
Iran, Islamic Republic of ,
Japan ,
Korea, Republic of ,
Lesotho ,
Martinique ,
Niger ,
Nigeria ,
Niue ,
Réunion ,
Sudan ,
Singapore ,
Slovenia ,
Senegal ,
Somalia ,
Tanzania, United Republic of ,
Venezuela ,
Viet Nam ,
e . Changes in distribution of eligible voters
5 4.3 %
Barbados ,
Eritrea ,
Iceland ,
Lesotho ,
Niger ,
f . Changes in distribution of registered voters
6 5.2 %
Barbados ,
Bahamas ,
Fiji ,
Croatia ,
Lesotho ,
Niger ,
g . Changes in administrative boundaries
17 14.7 %
Argentina ,
Barbados ,
Bangladesh ,
Germany ,
Croatia ,
Hungary ,
Japan ,
Korea, Republic of ,
Kazakhstan ,
Sri Lanka ,
Niger ,
Nigeria ,
Paraguay ,
Singapore ,
Somalia ,
Turkey ,
Venezuela ,
h . Change in government
3 2.6 %
Iran, Islamic Republic of ,
Singapore ,
Somalia ,
i . Specified number of parliamentary sessions
0 0.0 %
j . National census
12 10.4 %
Canada ,
Ghana ,
Ireland ,
India ,
Italy ,
Japan ,
Niger ,
Nigeria ,
New Zealand ,
Singapore ,
Somalia ,
United States of America ,
k . Boundaries redrawn every____period of years
21 18.2 %
American Samoa ,
Australia ,
Azerbaijan ,
Bosnia and Herzegovina ,
Canada ,
Germany ,
United Kingdom of Great Britain and Northern Ireland ,
Ireland ,
Japan ,
Kiribati ,
Lesotho ,
Marshall Islands ,
Papua New Guinea ,
Russian Federation ,
Sierra Leone ,
Turkey ,
Trinidad and Tobago ,
Tanzania, United Republic of ,
United States of America ,
Yemen ,
Zanzibar ,
l . Other
16 13.9 %
Armenia ,
Argentina ,
Australia ,
Bahamas ,
Cameroon ,
Costa Rica ,
Dominica ,
Ghana ,
Hungary ,
Kenya ,
Saint Lucia ,
Niger ,
Seychelles ,
Trinidad and Tobago ,
Tuvalu ,
Saint Vincent and the Grenadines ,
m . Not applicable
41 35.6 %
Andorra ,
Afghanistan ,
Armenia ,
Austria ,
Belgium ,
Bulgaria ,
Bahrain ,
Brazil ,
Switzerland ,
Chile ,
Cape Verde ,
Cyprus ,
Denmark ,
Algeria ,
Egypt ,
Spain ,
Micronesia, Federated States of ,
Guyana ,
Luxembourg ,
Morocco ,
Monaco ,
Moldova, Republic of ,
Montenegro ,
Maldives ,
Netherlands ,
Norway ,
Palestine ,
Portugal ,
Romania ,
Serbia ,
Sweden ,
Slovakia ,
San Marino ,
Senegal ,
Timor-Leste ,
Tunisia ,
Tonga ,
Uruguay ,
Holy See (Vatican City State) ,
Samoa ,
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