Another indicator of cultural, economic and social identity is population density, which is the relation between the number of people and the area of the place in which they live. An examination of the population density of various parts of Tehran shows that in various periods there has been a striking difference between the northern and southern districts of the city. According to the 1996 census, the population density varied from 412 persons per hectare and the average density of 300 in the southern half of the city to 40 to 90 persons per hectare in the northern part. In the west and southwest of the city, where municipality recently offers urban services, the population density is as little as one person per hectare (district 7 of region 21). The average population density in these parts is 13, which means these areas have the potential for expansion. While the northern and southern parts of the city continued to be different in 2006, the difference has now reduced. The change in the main center of determining population density from southern districts to northern and eastern districts of the city are one the clearest factors of this decrease. According to the calculations done based on the 2006 census, district 2 from region 10 with 434 people residing in each hectare and district 5 from region 15 with 402 people residing in each hectare have the first and second highest population density. Districts 1, 7 and 8 with an average population density of 350 people residing in each hectare are among the high density areas. It is noteworthy that during 2006, the new areas of the city are still among the lowest population density. Among these, district 3 of region 22 with 1.3 people residing in each hectare has the lowest population density in all of Tehran. Visual display of this index in Tehran shows two main corridors of population density. The first corridor starts from the southeast side of the city to central districts and is continued to the eastside.

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The second corridor with its north to west orientation and lower density than the first corridor shows a population residency tendency towards the northern districts and formation of higher population density areas in near future. The policy making in determining and selling building density along with changes in some index related to internal population quality and economic status of families for different parts of the city are, without a doubt, effective in the creation of such corridors.

Population density (2006)

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Population density (1996)

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