Iran visa extension is quite easy and can be done in all big tourist cities. Below you can see the list of offices you can extend Iran visa:
Tehran, Sattarkhan St., Shahr Ara St., not far from the Assyrian Church, No.33
South Shariati St., Saeb St.
Vahid St., Roudaki St., next to Arghavan Alley
West Azerbaijan Province, Urmia, Khatam Al-Anbia Highway
Mashhad, at the beginning of Firoozi Boulevard
Ahvaz, Padadshahr, Padad 10, in front of the amusement park
Zahedan, Shahid Dastgheib St., Amir Kabir Blvd.
Shiraz, Vali Asr Square, Modares Boulevard, corner of 57th Alley, Shiraz Passport Office
Kerman, Moallem Street
Rasht - Shariati Street
Bandar Abbas, Imam Khomeini Boulevard
Hamedan, Sardar Hossein Hamedani Boulevard
Yazd, Khatami Boulevard
It is better to go to these offices early in the morning to extend your Iran visa to avoid busy hours! Working hours are officially Saturday to Wednesday from 8 am to 2 pm, but usually, the actual business hours are 8 am to 12. If you are a woman who wants to extend your Iran visa please be sure to follow the rules of the Islamic Iranian dress code because some offices are strict in this regard.