An overwhelming proportion of the population -- 71 percent -- lived in urban areas, and Tehran and its satellite towns are home to 12.2 million inhabitants.

The literacy rate for those aged between 10 and 49 was 93 percent.

Most of the population is young, with 55 percent aged under 30.

The proportion of young Iranians use to be even higher, but a rapidly slowing birth rate -- an average 1.29 children per couple, compared to 1.62 in the last census in 2006 -- has resulted in a decrease in recent years.
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Even though Iran -- a Shiite theocracy -- is almost completely Muslim, other faiths are present.

There are 8,756 Jews in the country, according to the census. That was fewer than the 20,000 figure previously estimated.
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Education is an important value in Iran, as seen by a big jump in the number of people pursuing higher studies at university or in religious institutions (10.5 million, up from 6.9 million in 2006).

Men and women are split almost equally 50-50 in this category, underlining the growing number of educated Iranian women.