According to Iranian censuses from 1957 to 2017, the largest group of religious minorities in Iran were Christians. The population of this group in 1957 was about 113 thousand people, which was equivalent to six tenths of a percent of the total population of the country.

Statistics show that after the revolution, the population of Christians in Iranian society, which witnessed a population explosion, has decreased, and despite more than quadrupling the Muslim population in this period (from 18 million to 79 million), the Christian population has not grown significantly. It has reached about 130,000 people, which can be a sign of the high migration rate of the followers of this religion.

Christians, including Armenians and Assyrians, live in all provinces of Iran, but the largest number of followers of this religion live in Tehran, Isfahan and Alborz, East Azerbaijan and West Azerbaijan.