Below are details on the sources on which the individual country datasets are partially based:

BISNODE D&B
EUROSTAT
REGIODATA RESEARCH GMBH
TOMTOM
ALBANIA - INSTITUTE OF STATISTICS (INSTAT)
ARGENTINA - NATIONAL INSTITUTE OF STATISTICS AND CENSUSES (INDEC)
AUSTRALIA - AUSTRALIAN BUREAU OF STATISTICS (ABS) AND LICENSED BY ABS FOR RE-USE UNDER THE CREATIVE COMMONS ATTRIBUTION 2.5 AUSTRALIA (CC BY 2.5 AU)
AUSTRIA - STATISTICS AUSTRIA, ARVATO - AZ DIRECT GMBH
AZERBAIJAN - IT IS REFERRED TO THE DATA OF THE STATE STATISTICAL COMMITTEE OF THE REPUBLIC OF AZERBAIJAN
BANGLADESH - BANGLADESH BUREAU OF STATISTICS (BBS)
BELARUS - NATIONAL STATISTICAL COMMITTEE OF THE REPUBLIC OF BELARUS (WWW.BELSTAT.GOV.BY)
BELGIUM - STATISTICS BELGIUM (HTTP://STATBEL.FGOV.BE/FR/STATISTIQUES/OPENDATA/, JUNE 2018), NBB.STAT - NATIONAL BANK OF BELGIUM
BOSNIA-HERZEGOVINA - REPUBLIC SRPSKA INSTITUTE OF STATISTICS; AGENCY FOR STATISTICS OF BOSNIA AND HERZEGOVINA; FEDERAL OFFICE OF STATISTICS OF THE FEDERATION OF BOSNIA AND HERZEGOVINA
BRAZIL - IBGE - INSTITUTO BRASILEIRO DE GEOGRAFIA E ESTATÍSTICA, PORTAL BRASILEIRO DE DADOS ABERTOS
BULGARIA - NATIONAL STATISTICAL INSTITUTE
CANADA - ADAPTED FROM STATISTICS CANADA, CENSUS 2016 AND DISTRIBUTIONS OF HOUSEHOLD ECONOMIC ACCOUNTS 2017. THIS DOES NOT CONSTITUTE AN ENDORSEMENT BY STATISTICS CANADA OF THIS PRODUCT.
CHAD - OCHA CHAD, HTTPS://DATA.HUMDATA.ORG
CHILE - NATIONAL STATISTICS INSTITUTE OF CHILE (INE)
CHINA - QUOTED FROM THE WEB SITE OF THE NATIONAL BUREAU OF STATISTICS OF THE PEOPLE'S REPUBLIC OF CHINA (WWW.STATS.GOV.CN), THE GOVERNMENT OF THE HONG KONG SPECIAL ADMINISTRATIVE REGION - THE CENSUS AND STATISTICS DEPARTMENT, GOVERNMENT OF MACAO SPECIAL ADMINISTRATIVE REGION - STATISTICS AND CENSUS SERVICE, EARTH AT NIGHT 2012 VIA NASA EARTH OBSERVATORY
COLOMBIA - DEPARTAMENTO ADMINISTRATIVO NACIONAL DE ESTADÍSTICA: WWW.DANE.GOV.CO, THE MINISTRY OF INFORMATION TECHNOLOGY AND COMMUNICATIONS
CROATIA - REPUBLIC OF CROATIA - CROATIAN BUREAU OF STATISTICS, CROATIAN POST
CYPRUS - STATISTICAL SERVICE OF CYPRUS (CYSTAT); TRNC STATE PLANNING ORGANIZATION
CZECH REPUBLIC - CZECH STATISTICAL OFFICE (HTTPS://WWW.CZSO.CZ/CSU/CZSO/CONDITIONS_FOR_USE_AND_FURTHER_DISSEMINATION)
DENMARK - STATISTICS DENMARK – STATBANK.DK/FOLK1; STATISTICS DENMARK – STATBANK.DK/FAM55N,
CONTAINS GEODANMARK DATA FROM THE AGENCY FOR DATA SUPPLY AND EFFICIENCY AND
DANISH MUNICIPALITIES, APRIL 2016
ECUADOR - INSTITUTO NACIONAL DE ESTADÍSTICA Y CENSOS (INEC): WWW.ECUADORENCIFRAS.GOB.EC
ESTONIA - STATISTICS ESTONIA, REPUBLIC OF ESTONIA LAND BOARD, JULY 2014, HTTP://WWW.MAAAMET.EE/
FINLAND - STATISTICS FINLAND POPULATION 31.12. BY AREA, INFORMATION AND SEX, STATISTICS FINLAND HOUSEHOLD-DWELLING UNITS BY AREA, SIZE OF HOUSEHOLD-DWELLING UNIT, TYPE OF BUILDING, YEAR AND UNIT,  STATISTICS FINLAND, NUMBERS AND INCOME OF DWELLING POPULATION AND HOUSEHOLD-DWELLING UNITS BY MUNICIPALITY, YEAR AND DATA, STATISTICS FINLAND, POPULATION STRUCTURE 2016, POSTAL CODE AREA, STATISTICS FINLAND, SIZE AND STAGE IN LIFE OF HOUSEHOLDS 2016, POSTAL CODE AREA, STATISTICS FINLAND, HOUSEHOLDS' DISPOSABLE MONETARY INCOME 2015, POSTAL CODE AREA; THE MATERIAL WAS DOWNLOADED FROM STATISTICS FINLAND'S INTERFACE SERVICE ON 04 JULY 2018 WITH THE LICENCE CC BY 4.0 (HTTPS://CREATIVECOMMONS.ORG/LICENSES/BY/4.0/DEED.EN), THE NATIONAL LAND SURVEY OF FINLAND, HTTP://WWW.MAANMITTAUSLAITOS.FI
FRANCE - NATIONAL INSTITUTE OF STATISTICS AND ECONOMIC STUDIES (WWW.INSEE.FR), CONTOURS…IRIS® ÉDITION 2016 (HTTP://PROFESSIONNELS.IGN.FR/CONTOURSIRIS), CAISSE NATIONALE D’ALLOCATION FAMILIALE (WWW.DATA.CAF.FR, 08.2018), DIRECTION GÉNÉRALE DES FINANCES PUBLIQUES (WWW.IMPOTS.GOUV.FR, 07.2018), GFK LIFESTYLE RESEARCH, IGN FRANCE, HTTPS://WWW.DATA.GOUV.FR
GEORGIA - NATIONAL STATISTICS OFFICE OF GEORGIA
GERMANY – STATISTISCHES BUNDESAMT (DESTATIS), GENESIS-ONLINE (TABLE 173-21-5-B), DATA LICENCE BY-2-0, WWW.GOVDATA.DE/DL-DE/BY-2-0, GENESIS-ONLINE (TABLE 173-43-4), DATA LICENCE BY-2-0, WWW.GOVDATA.DE/DL-DE/BY-2-0, STATISTISCHE ÄMTER DES BUNDES UND DER LÄNDER, GENESIS-ONLINE, DATA LICENCE BY-2-0, WWW.GOVDATA.DE/DL-DE/BY-2-0, BAYERISCHE VERMESSUNGSVERWALTUNG, HTTP://WWW.GEODATEN.BAYERN.DE/, GEOPORTAL BADEN-WÜRTTEMBERG, HTTP://WWW.GEOPORTAL-BW.DE/, SENATSVERWALTUNG FÜR STADTENTWICKLUNG UND UMWELT BERLIN, HTTP://WWW.STADTENTWICKLUNG.BERLIN.DE/, DAT REPORT 2018, © KRAFTFAHRT-BUNDESAMT, FLENSBURG, FEDERAL EMPLOYMENT AGENCY, GERMAN STATUTORY PENSION INSURANCE SCHEME, DEUTSCHE POST AG, GFK CONSUMER HEALTH, GFK CONSUMER PANEL, GFK LIFESTYLE RESEARCH, GFK FINANCIAL MARKET PANEL
GREECE - HELLENIC STATISTICAL AUTHORITY (ELSTAT) 
GUATEMALA - OPEN ENERGY INFORMATION, HTTP://EN.OPENEI.ORG/
GUINEA - INTERNATIONAL ORGANIZATION FOR MIGRATION, HTTPS://DATA.HUMDATA.ORG/
HONDURAS - OPEN ENERGY INFORMATION, HTTP://EN.OPENEI.ORG
HUNGARY - HUNGARIAN CENTRAL STATISTICAL OFFICE (HCSO), NATIONAL TAX AND CUSTOMS ADMINISTRATION OF HUNGARY
ICELAND - STATISTICS ICELAND, BASED ON DATA FROM NATIONAL LAND SURVEY OF ICELAND, HTTP://WWW.LMI.IS
IRAQ - CENTRAL STATISTICAL ORGANIZATION IRAQ (CSO)
IRELAND - CENTRAL STATISTICS OFFICE, BASED ON DATA FROM THE ORDNANCE SURVEY OF IRELAND (OSI), HTTP://WWW.OSI.IE
ISRAEL - CENTRAL BUREAU OF STATISTICS (CBS), LOCALITIES AND POPULATION, BY POPULATION GROUP, DISTRICT, SUB-DISTRICT AND NATURAL REGION (11.01.2018), AVAILABLE ONLINE: HTTP://WWW.CBS.GOV.IL/READER/SHNATON/TEMPL_SHNATON_E.HTML?NUM_TAB=ST02_17&CYEAR=2017, COPIED AND DISTRIBUTED AS IS IN ACCORDANCE WITH THE CBS LICENSE AT THE WEBSITE HTTP://WWW.CBS.GOV.IL/WWW/USAGE.HTM; PALESTINIAN CENTRAL BUREAU OF STATISTICS
ITALY - ITALIAN NATIONAL INSTITUTE OF STATISTICS (CC BY 3.0 IT; HTTPS://CREATIVECOMMONS.ORG/LICENSES/BY/3.0/IT/; DESATURATED FROM ORIGINAL), ITALIAN MINISTRY OF ECONOMY AND FINANCE
JAPAN - STATISTICS BUREAU, MINISTRY OF INTERNAL AFFAIRS AND COMMUNICATIONS (HTTP://WWW.STAT.GO.JP/ENGLISH/INDEX.HTM), MINISTRY OF HEALTH, LABOUR AND WELFARE
KENYA - KENYA NATIONAL BUREAU OF STATISTICS (KNBS)
KOSOVO - KOSOVO AGENCY OF STATISTICS, MINISTRY OF LOCAL GOVERNMENT ADMINISTRATION, UNDP KOSOVO, OSCE
KUWAIT - THE PUBLIC AUTHORITY FOR CIVIL INFORMATION – STATISTICS SERVICES SYSTEM
LATVIA - CENTRAL STATISTICAL BUREAU OF LATVIA, REGIONAL DEVELOPMENT INDICATORS MODULE (WWW.RAIM.GOV.LV)
LIBYA - BUREAU OF STATISTICS AND CENSUS LIBYA, WORLD BANK: WORLD DEVELOPMENT INDICATORS, OCHA LIBYA, HTTPS://DATA.HUMDATA.ORG/
LIECHTENSTEIN - OFFICE OF STATISTICS LIECHTENSTEIN
LITHUANIA - STATISTICS LITHUANIA
LUXEMBOURG - STATEC
MACEDONIA - STATE STATISTICAL OFFICE
MALAYSIA - DEPARTMENT OF STATISTICS, MALAYSIA
MALTA - NATIONAL STATISTICS OFFICE
MEXICO - INEGI, ENCUESTA INTERCENSAL 2015, "CÓDIGOS POSTALES, COORDENADAS Y COLONIAS" PUBLISHED BY CORREOS DE MEXICO, HTTPS://DATOS.GOB.MX
MOLDOVA - NATIONAL BUREAU OF STATISTICS OF THE REPUBLIC OF MOLDOVA HTTP://WWW.STATISTICA.MD/PAGEVIEW.PHP?L=EN&IDC=479, CENTRE FOR STATE INFORMATION RESOURCES "REGISTRU"
MONTENEGRO - STATISTICAL OFFICE OF MONTENEGRO – MONSTAT, POSTA CRNE GORE
MOROCCO – HAUT-COMMISSARIAT AU PLAN DU MAROC
NETHERLANDS - STATISTICS NETHERLANDS (CC BY 3.0 NL; HTTPS://CREATIVECOMMONS.ORG/LICENSES/BY/3.0/NL/DEED.EN; DESATURATED FROM ORIGINAL), NGR NATIONAAL GEOREGISTER, HTTP://NATIONAALGEOREGISTER.NL
NEW ZEALAND - STATISTICS NEW ZEALAND, DATA LICENSED BY STATISTICS NZ FOR RE-USE UNDER THE CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENCE, HTTPS://CREATIVECOMMONS.ORG/LICENSES/BY/4.0/, LINZ - LAND INFORMATION NEW ZEALAND DATA, HTTPS://DATA.LINZ.GOVT.NZ/
NORWAY - STATISTICS NORWAY (WWW.SSB.NO), KARTVERKET, WWW.KARTVERKET.NO
PAKISTAN - PAKISTAN BUREAU OF STATISTICS
PERU - NATIONAL INSTITUTE OF STATISTICS AND INFORMATICS (INEI), SUPERINTENDENCIA NACIONAL DE ADUANAS Y ADMINISTRACIÓN TRIBUTARIA (SUNAT)
PHILIPPINES - PHILIPPINE STATISTICS AUTHORITY (HTTPS://PSA.GOV.PH/ARTICLE/TERMS-USE)
POLAND - STATISTICS POLAND, CENTRALNEGO OŚRODKA DOKUMENTACJI GEODEZYJNEJ KARTOGRAFICZNEJ, HTTP://WWW.CODGIK.GOV.PL, GFK POLONIA
PORTUGAL - INSTITUTO NACIONAL DE ESTATÍSTICA – PORTUGAL (STATISTICS PORTUGAL), INSTITUTO GEOGRÁFICO PORTUGUÊS, HTTP://WWW.IGEO.PT/
ROMANIA - NIS ROMANIA WWW.INSSE.RO AND HTTP://STATISTICI.INSSE.RO/SHOP/?LANG=EN, NATIONAL AGENCY FOR CADASTRE AND LAND REGISTRATION, HTTP://DATA.GOV.RO
RUSSIA - FEDERAL STATE STATISTICS SERVICE (ROSSTAT)
SAUDI ARABIA - GENERAL AUTHORITY FOR STATISTICS - KINGDOM OF SAUDI ARABIA
SERBIA - STATISTICAL OFFICE OF THE REPUBLIC OF SERBIA (SORS)
SIERRA LEONE - STATISTICS SIERRA LEONE
SINGAPORE - SINGAPORE DEPARTMENT OF STATISTICS (TABLEA13-2000-2017.XLS), SINGAPORE OPEN DATA LICENCE VERSION 1.0, HTTPS://DATA.GOV.SG/OPEN-DATA-LICENCE
SLOVAKIA - STATISTICAL OFFICE OF THE SLOVAK REPUBLIC: WWW.STATISTICS.SK, MINISTRY OF INTERIOR OF THE SLOVAK REPUBLIC
SLOVENIA - STATISTICAL OFFICE OF THE REPUBLIC OF SLOVENIA
SOUTH AFRICA - STATISTICS SOUTH AFRICA, MUNICIPAL DEMARCATION BOARD, HTTP://WWW.DEMARCATION.ORG.ZA/, NATIONAL GEOSPATIAL INFORMATION, HTTP://WWW.NGI.GOV.ZA/
SOUTH KOREA - KOREAN STATISTICAL INFORMATION SERVICE (KOSIS), DATA.GO.KR
SPAIN - INE WEBSITE: WWW.INE.ES (POPULATION, JAN 18, 2018), PUBLIC EMPLOYMENT SERVICE SPAIN, AECC
SWEDEN - STATISTICS SWEDEN
SWITZERLAND -  FEDERAL STATISTICAL OFFICE (BFS), GEOSTAT - NEW CENSUS, PERIODE 2016 - COPY AUGUST 2017, SWISS FEDERAL AUTHORITIES (FEDERAL OFFICE OF TOPOGRAPHY SWISSTOPO, HTTP://WWW.SWISSTOPO.ADMIN.CH/ AND FEDERAL DIRECTORATE OF CADSTRAL SUYRVEYING, HTTP://WWW.CADASTRE.CH), FEDERAL TAX ADMINISTRATION, GFK SWITZERLAND
TAIWAN - DEPARTMENT OF HOUSEHOLD REGISTRATION, M.O.I., NATIONAL LAND SURVEYING AND MAPPING CENTER, HTTPS://DATA.GOV.TW
THAILAND - NATIONAL STATISTICAL OFFICE THAILAND
UGANDA - UGANDA BUREAU OF STATISTICS 2016, THE NATIONAL POPULATION AND HOUSING CENSUS 2014
UKRAINE - STATE STATISTICS SERVICE OF UKRAINE (WWW.UKRSTAT.GOV.UA)
UNITED KINGDOM - OFFICE FOR NATIONAL STATISTICS LICENSED UNDER THE OPEN GOVERNMENT LICENCE V.3.0 (HTTP://WWW.NATIONALARCHIVES.GOV.UK/DOC/OPEN-GOVERNMENT-LICENCE/VERSION/3/), DEPARTMENT FOR WORK AND PENSIONS, ORDNANCE SURVEY, HTTP://WWW.ORDNANCESURVEY.CO.UK, HM REVENUE & CUSTOMS (HMRC)
UNITED STATES - U.S. CENSUS BUREAU, U.S. BUREAU OF ECONOMIC ANALYSIS, U.S. BUREAU OF LABOR STATISTICS, GFK LIFESTYLE RESEARCH
UZBEKISTAN - THE STATE COMMITTEE OF REPUBLIC UZBEKISTAN ON STATISTICS (WWW.STAT.UZ)
VIETNAM - GENERAL STATISTICS OFFICE OF VIETNAM
ZAMBIA - CENTRAL STATISTICAL OFFICE