National population and housing censuses used to be conducted once a decade in Iran, as stipulated by the national legislation, in the years between 1956 and 2006. The first such census was completed by the Bureau of General Statistics in 1956; subsequent censuses were done by the Statistical Center of Iran (SCI) in 1966, 1976, 1986, 1996, and 2006. The Cabinet adopted in 2007 that the time interval for population and housing censuses be reduced to five years from 10 years.
The 2011 census was the seventh national population and housing census of the country which was conducted on October 24, 2011 throughout Iran.
By providing correct statistics and information on the size, structure, and characteristics of Iran’s population, this census serves as an appropriate tool for the country’s planners, policymakers, and officials in the process of designing and implementing social, economic, and cultural programs. Furthermore, this census as one of the fundamental activities in the country’s statistical system provides essential frameworks for future in-depth analysis and surveys within the areas of population and household.
A total of almost 114,000 enumerators and trained supervisors and logistic staff participated in this national event which lasted from October 24 to November 13, 2011 in 31 provinces, 1,143 cities, and 96,459 settlements2; the census was the product of over two years of intense preparatory technical activities in the SCI in coordination with Iran’s executive institutions and General Governs. To gain assurance of appropriate implementation, two pilot censuses were conducted in 2009 (30 provinces) and 2010 (four provinces) and the questionnaires and the execution modalities and methods of the census were finalized and adopted by the National Census Committee based on the conclusion and lessons learnt from these two pilot studies.
Kind of Data
Census/enumeration data [cen]
Unit of Analysis
The scope of the survey includes:
Basic indicators: population, household, and housing;
Data on new subjects: national identity number, access to internet, agricultural activities of the household, and incidence of death in households (at the individual level).
Producers and sponsors
Statistical Centre of Iran
Dates of Data Collection
Data Collection Mode
Data Collection Notes
With regard to the related objectives, some questionnaires are designed to collect data from the censuses. The procedures for establishing communications between the statistical units and filing out the questionnaires differ due to the country’s demographic, social and cultural characteristics. In this respect, the routine practices are introduced as follows:
- Face- to- face interview
- Computer- assisted interview
- Telephone interview
- Computer-assisted self-enumeration
- Self-enumeration (distribution of forms by the enumerator, or mail and collection by the enumerator or mail,
The census forms are designed to collect items for different purposes. Four forms have been used in the 1390 Census:
- Form 1. Listing
- Form 2. The household Questionnaire
- Form 3. The institutional Household Questionnaire
- Form 4. Village Profile
Form 2 (the Household Questionnaire and Form 3 (The Institutional Household Questionnaire) Information on the private settled, private unsettled and collective households is collected through Form 2. Household Questionnaire and information on the institutional households through Form 3. Institutional Household Questionnaire. Due to the similarity between the two forms and their significance in the Census process their contents are reviewed and described in this part.
The data collected through each census or survey may be accompanied by some missing or inconsistent data. Such errors might be caused by the respondent’s wrong or inadequate response or during the data processing. Thus, to be centain about the consistency of the data produced, the Edit and Imputation Committee is established. This Committee, in addition to cleaning the data, is required to identify errors and to reduce them in the first stages of enumeration and to introduce instruments to achieve this purpose. Some of these instruments can be manpowers such as editing clerks in provinces and other instruments like machine-based editing.
The Committee should also apply some methods to identify quality data at the earliest time possible. The Committee’s objectives on the whole are:
a. To analyse the topics and types of errors in previous censuses technically.
b. To study the methods used in previous censuses, and the methods used in other countries in the past with a look at future.
c. To determine the range of edit and imputation and to select the best and the most efficient methodology for Census Edit and Imputation.
Statistical Centre of Iran
Use of the dataset must be acknowledged using a citation which would include:
- the Identification of the Primary Investigator
- the title of the survey (including country, acronym and year of implementation)
- the survey reference number
- the source and date of download
Statistical Centre of Iran. Iran General Census of Population and Housing 2011. Ref. IRN_2011_PHC_v01_M. Dataset downloaded from [url] on [date].
Statistical Centre of Iran
Disclaimer and copyrights
The user of the data acknowledges that the original collector of the data, the authorized distributor of the data, and the relevant funding agency bear no responsibility for use of the data or for interpretations or inferences based upon such uses.