The average number of household members in Tehran is 3.4, in Tehran province 3.6 and in the country: 4.3.
The factors which explain the small size of the household in Tehran include: lower level of fertility, growth of the nucleus household; and increasing the number of households living in flats. However, the size of the household is not the same in all parts of the city.
The size increases as we move from the central and northern districts to the suburbs, because in the suburbs the fertility level is higher and the people living in these districts are mostly migrants with a strong traditional culture, most of whom have migrated with extended households.
Districts with elderly population have the smallest size households due to low fertility level.
District 4 of region 9 has the greatest household size (5), followed by district 6 of region 14 (4.4) and district 3 of region 9 (4.2). Districts 2 of region 7 and district 3 have the smallest household size (3).

 Table 2.7  The average number of hosehold members in the country, the city and province of Tehran
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Average of hosehold size (2006)

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Average of hosehold size (1996)

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