Sources

Statistical organizations, agencies and other main resources. Additional sources you can find on page, where data appears.

Andorra:
  - Departament d'Estatdística, Andorra
Afghanistan:
  - Central Statistics Organization, Afghanistan en.
Albania:
  - Instituti i Statistikës, Tiranë
Armenia:
  - National Statistical Service of the Republic of Armenia (city population in PDF by provinces)
Argentina:
  - Instituto Nacional de Estadística y Censos de la Republica Argentina
Austria:
  - Statistik Austria
Australia:
  - Australian Bureau of Statistics
Bosnia and Herzegovina:
  - Federalni zavod za statistiku
Bangladesh:
  - Bangladesh Bureau of Statistics (BBS)
Belgium:
  - Statistics Belgium, NIS-INS, Ministry of Economic Affairs
Bulgaria:
  - National Statistical Institute Bulgaria
Brazil:
  - Instituto Brasileiro de Geografia e Estatística
Bahamas:
  - The government of the Bahamas, Department of Statistics
Botswana:
  - Central Statistical Office, Republic of Botswana En.
Belarus:
  - National Statistical Committee of the Republic of Belarus
Canada:
  - Statistics Canada In English, Français
Switzerland:
  - Bundesamt für Statistik, Schweiz
Chile:
  - Instituto Nacional de Estadísticas, Santiago de Chile
China:
  - National Bureau of Statistics of China
Colombia:
  - Departamento Administrativo Nacional de Estadistica, Republica de Columbia
Costa Rica:
  - Instituto nacional de estadística y censos
Cuba:
  - Oficina Nacional de Estadísticas, Cuba
Cyprus:
  - Republic of Cyprus - statistical service
Czech Republic:
  - Český statistický úřad | ČSÚ (Čeština) Czech Statistical Office
Germany:
  - Statistisches Bundesamt Deutschland In deutscher Sprache
Denmark:
  - Denmark Statistics
Algeria:
  - Office National des Statistiques (Fr.)
Ecuador:
  - El Instituto Nacional de Estadística y Censos del Ecuador In Spanish
Estonia:
  - Statistical Office of Estonia
Egypt:
  - Central Agency for Public Mobilization and Statistics, Egypt
Spain:
  - Instituto Nacional de Estadística, España
Finland:
  - Statistics Finland
Faroe Islands:
  - Hagstova Føroya, Statistics Faroe Islands
France:
  - Institut National de la Statistique et des Études Économiques, Paris, France
United Kingdom:
  - UK National Statistics
Greece:
  - Hellenic Statistical Authority
Croatia:
  - Državni zavod za statistiku - Republika Hrvatska
Hungary:
  - Központi Statisztikai Hivatal
Indonesia:
  - Badan Pusat Statistik Indonesia
Ireland:
  - Central Statistics Office, Ireland
Israel:
  - The Central Bureau of Statistics (Israel)
Isle of Man:
  - Isle of Man Census Report, www.gov.im
India:
  - Office of the Registrar General and Census Commissioner, India
Iceland:
  - Statistics Iceland
Italy:
  - Istituto Nazionale di Statistica, Italia National Institute of Statistics (Italy)
Jamaica:
  - Statistical Institute of Jamaica
Japan:
  - Statistics Bureau Japan
North Korea:
  - North Korea's Cities, universtiat, Wien (North Korea don't have official statistical website)
South Korea:
  - KOSIS KOrean Statistical Information Service En.
Kuwait:
  - The Public Authority For Civil Information Statistical reports
Liechtenstein:
  - Amt für Statistik, Fürstentum Liechtenstein
Lithuania:
  - Department of Statistics, Republic of Lithuania
Luxembourg:
  - Le Portail des Statistiques du Luxembourg
Latvia:
  - Central Statistical Bureau of Latvia
Monaco:
  - Population et emploi / IMSEE — Monaco IMSEE (in French). Imsee.mc
Moldova:
  - National Bureau of Statistics, Moldova
Montenegro:
  - Zavod za statistiku Crne Gore - MONSTAT
Macedonia:
  - State Statistical Office, Republic of Macedonia
Malta:
  - National Statistic Office, Malta
Mexico:
  - Instituto Nacional de Estadística y Geografía, México
Nigeria:
  - National Population Commission of Nigeria
Netherlands:
  - CBS Statistics Netherlands
Norway:
  - Statistics Norway
New Zealand:
  - Statistics New Zealand
Panama:
  - Instituto Nacional de Estadística y Censo - Panamá
Philippines:
  - Philippine Statistics Authority | Republic of the Philippines
Poland:
  - Central Statistical Office Poland
Portugal:
  - Instituto Nacional de Estatística Portugal
Romania:
  - Romania National Institute of Statistics
Serbia:
  - Statistical Office of the Republic of Serbia Републички завод за статистику
Russia:
  - Федеральная служба государственной статистики На русском
Saudi Arabia:
  - General Authority for Statistics
Sweden:
  - Statistiska Centralbyrån, Sverige
Slovenia:
  - Statistical Office of the Republic of Slovenia
Slovakia:
  - Statistical Office of the Slovak Republic
San Marino:
  - Upeceds: San Marino, statistica.sm
Thailand:
  - National Statistical Office of Thailand
Turkey:
  - Turkish Statistical Institute
Taiwan:
  - National Statistics, Republic of China (Taiwan)
Ukraine:
  - State Statistics Committee of Ukraine
United States:
  - U.S. Census Bureau
Uruguay:
  - Instituto Nacional de Estadística, Uruguay
Venezuela:
  - Instituto Nacional de Estadística, Venezuela
Vietnam:
  - GENERAL STATISTICS OFFICE of VIET NAM
South Africa:
  - Statistics South Africa