Census of population and housing – one percent sample (2011)



Changelog (Archive version):

1.0 - 09/06/2020
* First import routine of the study



Changelog (Source release):

* first release



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Data Kind:
individual data

Time Dimensions:
time series

3.15 MB
other documentation

The Census of Population and Housing is one of the most important surveys carried out by ISTAT. It is conducted every ten years from 1861, and the main objectives are: the count of the whole population and the recognition of its structural characteristics; updating and revision of civil registers; the definition of the legal population for juridical and electoral purposes; the collection of information about the number and structural characteristics of houses and buildings.


The Census collects information about demographic and family structure of the population, the types of their households, their level of education, their employment status, and other informations on residents population.


In 2011, for the first time, some information of socio-economic character were measured on a sample basis through the use of two types of questionnaire: one in a reduced form, with a few questions, including indispensable information for the production of the data required by the European Union with an high spatial detail, and one in complete form.


In particular, Istat provides a 1% sample data (594,247 cases) released in two separate datasets: the first file (individui) refers to persons usually resident in private households and in Institutional households and the second one (alloggi) refers to living quarters.

Data are available for free in CSV format (registration required). After logging in, please click on the green button download_arrow in the box at the right.

In order to optimize the time of use of the dataset, UniData offers a service of conversion in the statistical software format (SPSS, Stata, R or SAS). For detailed information visit the Services for Istat Data page.

For members, instead, data are available in the main formats used by the software for the statistical analysis.

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Topic Classification:

  • Nations: Italy

    Geographical Unit: region

    Analysis Unit: individual, family, housing unit

    Universe: All people present in Italy on Census day, 09 October 2011.

    Sample Procedure: In urban areas with at least 20,000 inhabitants a sample was selected by a simple random sampling without replacement procedure of one third of the families. A complete version (long form) of the questionnaire has been sent to the sample, while a short version the questionnaire has been sent to all other inhabitants.

    Weight: No weight used

    Collection Mode: web-based self-administered questionnaire (CAWI), mail questionnaire

    Collection Size: UniData supplies: 2 dataset ("individui" and "alloggi" file) in SPSS format (available to members only) or CSV (for other users); 1 PDF format file of questionnaire (ita); 1 PDF format file of methodological notes (ita) e 1 PDF format file of codebook (ita) (5 file)


    Methodological Notes (pdf):
    Codebook (zip):
    DDI Documentation:
    DDI Documentation

    Data Use Restriction:
    ISTAT data are released in according to Creative Commons – Attribution 3.0 Licence, available here. The redistribution to the third party, even in partial form, of data available to UniData members only is not allowed.
    Source Contact: Contact Centre

    Istat. (2011) Census of population and housing – one percent sample. UniData - Bicocca Data Archive, Milan. Study Number SN201. Data file version 1.0

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