Shina Islam is the current national religion, Zoroastrianism was destroyed for the most part when the Arabs conquered Persia, but it is recovering somewhat, but still Islam is the religion of 95% of the population, the name of the country is ISLAMIC republic of Iran
Shia Islam is the state religion in Iran
However there are as many as 90000 Zoroastrians living in the country.Mainly in city of Yazd there are also some of them living in Isfahan, Kerman and Shiraz there are also as many as 9 fire temples currently functioning across the country.