Having the documents mentioned above, you can apply for your visa at any international airports of Iran:
Tehran Imam Khomeini Airport
Tehran Mehrabad Airport
Isfahan Shahid Beheshti Airport
Mashhad Hashemi Nejad Airport
Kerman Ayatollah Hashemi Rafsanjani Airport
Tabriz Shahid Madani Airport
Urmia Shahid Bakeri Airport
Kermanshah Shahid Ashrafi Esfahani Airport
Bandar Mahshahr Shohaday-e Parvaz 655 Airport
Qeshm International Airport