Taking part in the national population census 2021

Last update 29.11.2021

The 2021 population census is being organised jointly by the National Institute for Statistics and Economic Studies (STATEC) and the country's various communes starting 8 November 2021. Its objectives are to collect certain:

  • socio-economic data on individuals;
  • data on households;
  • data on housing.

Population censuses provide socio-economic information that facilitates, among other things, the forecasting of needs in terms of land use planning, schools, nurseries, hospitals, retirement and care homes, housing, etc.

Please note that since 29 November 2021 it is no longer possible to complete the questionnaire online using MyGuichet.lu.

Who is concerned

Only persons residing in Luxembourg are concerned by the population census.

People living in the same dwelling only have to fill in one questionnaire. The information entered in the questionnaire must reflect the situation of the persons on 8 November 2021.


Persons wishing to take the census online via MyGuichet.lu must use the access code provided to them in advance by post by STATEC.


The online questionnaire for the population census is available on MyGuichet.lu from 8 to 28 November 2021.

The questionnaire in paper format can be filled in as soon as it is received (it is distributed by the commune from 22 November) and it must be returned by 5 December 2021 at the latest.

How to proceed

Responding to the questionnaire

The questionnaire is available in German, English, French, Luxembourgish and Portuguese.

The questionnaire can be completed online from 8 November 2021 to 28 November 2021 by using the access code that STATEC sent by post.

For persons who prefer to respond using the paper questionnaire, communes will be distributing copies from 22 November 2021. No additional formalities need to be carried out to receive the hard-copy. The questionnaire has to be sent back by 5 December 2021 at the latest.

Only one questionnaire – whether online via MyGuichet.lu or in paper form – should be filled in for all persons living in the same place. Even if the household has received several access codes, only one access code must be used.

If no-one in the household has received an access code, they should contact the National Institute for Statistics and Economic Studies free of charge (Institut national de la statistique et des études économiques - STATEC):

  • by phone at 8002 2121 from Monday to Friday between 8.00 and 18.00; or
  • by email to: rp2021@statec.etat.lu.

STATEC must be contacted in the event of problems with the questionnaire.

General information about the online questionnaire on MyGuichet.lu

There are 2 ways to complete the questionnaire:

  • using the MyGuichet.lu authentication procedure with the LuxTrust credentials: in this case, some of the fields in the questionnaire will already be filled in and it is possible to save and exit the questionnaire at any time and come back to it;
  • without the MyGuichet.lu authentication procedure: in this case, the declarant will have to fill in all the requested information manually, and will not be able to save and come back to the questionnaire again.


Participation in the population census is mandatory.


Pursuant to the law of 10 July 2011 on the organisation of the National Institute for Statistics and Economic Studies (Institut national de la statistique et des études économiques – STATEC), failing to respond, or intentionally providing incorrect data, may lead to financial sanctions. This legal provision aims to contribute to the quality of the statistics produced, by enabling STATEC to collect reliable and sufficiently representative data on the resident population.

Personal Data

The population census aims to collect a certain amount of personal data, divided into 3 categories:

  • socio-economic data on individuals;
  • data on households;
  • data on housing.

This data is processed by STATEC.

Lawfulness of processing

The processing is lawful within the meaning of the General Data Protection Regulation (EU) No 2016/679, because it is required for the fulfilment of a legal obligation by which the data controller is bound. This legal obligation is described in Regulation (EC) No 763/2008 on population and housing censuses.

The data collected is treated confidentially. Such data will only be used for purely statistical purposes, and in no circumstances will it ever be disclosed. STATEC's representatives and agents are personally responsible for the strict observance of statistical confidentiality. STATEC has also put in place a series of technical and organisational measures to protect the personal data of citizens, such as the security of computer processing and the strict limitation of data access rights granted to STATEC's agents and subcontractors.

The personal data collected will be permanently deleted no later than 3 years after collection.

Source of personal data

In addition to the data received via the questionnaire (online or on paper), STATEC collects the following by using the declarant's national identification number or home address:

  • some demographic data – drawn from the National Registry of Natural Persons (Registre National des Personnes Physique - RNPP);
  • for persons who work, their sector of activity – provided by the Joint Social Security Centre (Centre Commun de la Sécurité Sociale - CCSS);
  • data on buildings and dwellings, taken from the Register of Buildings and Dwellings (Registre des Bâtiments et des Logements - RBL).

As soon as STATEC has the data it needs, the identification data (name, address, national identification number) are deleted.

In the event of a dispute regarding the protection of personal data

In the event of disagreement regarding the protection of personal data, STATEC's Data Protection Officer (DPO) can be contacted:

  • by post: DPO, STATEC, B.P. 304, L-2013 Luxembourg; or
  • by phone at 247-88 492 ; or
  • by email: dpo@statec.etat.lu.

Pursuant to Articles 15 to 21 of the General Data Protection Regulation (EU) No 2016/679, questionnaire respondents have the following rights:

  • the right to access their personal data;
  • the right to rectification or erasure of their personal data;
  • the right to restrict processing, or to object to processing, of their personal data;
  • the right to data portability.

It is also possible to lodge a complaint with the National Commission for Data Protection (CNPD):

  • by post: CNPD, 15 Boulevard du Jazz, L-4370 Belvaux; or
  • by phone: 26 10 601.

Good to know

Additional information is available on the website of the 2021 population census.

In the event of questions, STATEC should be contacted:

  • by phone at 8002 2121 (toll-free number) from Monday to Friday between 8.00 and 18.00; or
  • by email: rp2021@statec.etat.lu.

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