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Iran -
iran.gov -
iri -
iri.gov -
islamic-repubic-iran -
islamic-repubic-iran.gov -

The first two domains under the name of each province are reserved for the 
provincial government, the rest are reserved for municipalities.

1.Ardebil (ar)

ostan-ar - ostan-ar.gov - ardebil - bilesavar - garmi - givi - khalkhal - meshkinshahr - namin - nir - parsabad -

2.Azarbaijan-Gharbi (ag)

ostan-ag - ostan-ag.gov - bukan - khoy - mahabad - maku - miandoab - naqade - orumieh - oshnavieh - piranshahr - sainqale - salmas - sardasht - siahcheshme - takab -

3.Azarbaijan-Sharqi (as)

ostan-as - ostan-as.gov - azarshahr - bonab - bostanabad - hashtrud - heris - jolfa - kalibar - malekan - maraghe - marand - mianeh - osku - sarab - shabestar - tabriz -

4.Bushehr (bu)

- ostan-bu ostan-bu.gov - ahrom - borazjan - bushehr - deylam - deyr - gonaveh - kangan - khormoj

5.Charmahal-Bakhtiyari (cb)

- ostan-cb - ostan-cb.gov - ardal - borujen - farsan - lordegan - shahrekord

6.Esfahan (es)

- ostan-es - ostan-es.gov - aran-bidgol - ardestan - daran - esfahan - falavarjan - fereydunshahr - golpaygan - kashan - khansar - khomeinishahr - mobarakeh - nain - najafabad - natanz - samirom - shahinshahr - shahreza - tiran - zarrinshahr

7.Fars (fr)

- ostan-fr - ostan-fr.gov - abadeh - ardekan - arsanjan - darab - eqlid - estahban - fasa - firuzabad - jahrom - kazerun - lamard - lar - marvdasht - neyriz - nurabad - safashahr - shiraz - surian

8.Gilan (gl)

- ostan-gl - ostan-gl.gov - amlesh - anzali - astaneh - astara - fuman - hashtpar - lahijan - langerud - masal - masuleh - rasht - rezvanshahr - rudbar - rudsar - shaft - siahkal - sumeesara

9.Golestan (gs)

- ostan-gs - ostan-gs.gov - azadshahr - bandargaz - bandartorkman - gorgan - kordkuy - gonbadkavus - minudasht

10.Hamedan (hm)

- ostan-hm - ostan-hm.gov - asadabad - bahar - hamedan - kabudarahang - laljin - malayer - nahavand - razan - samen - toyserkan

11.Hormozgan (hr)

- ostan-hr - ostan-hr.gov - abumusa - bandarabbas - bastak - bandarlangeh - dehbarez - hajiabad - hormoz - jask - minab - qeshm - sirik

12.Ilam (il)

- ostan-il - ostan-il.gov - abdanan - darreshahr - dehloran - ilam - ivan - mehran - sarableh

13.Kerman (kr)

- ostan-kr - ostan-kr.gov - baft - bam - bardsir - jiroft - kerman - kohnuj - mahan - rafsanjan - ravar - shahdad - sharebabak - sirjan - zarand

14.Kermanshah (ks)

- ostan-ks - ostan-ks.gov - eslamabadgharb - gilangharb - harsin - javanrud - kangavar - karand - kermanshah - paveh - qasreshirin - ravansar - sahneh - sarpolzahab - sonqor 

15.Khorasan (kh)

- ostan-kh - ostan-kh.gov - birjand - bojnurd - chenaran - daregaz - esfarayen - fariman - ferdos - gonabad - jajrom - kashmar - khaf - mashhad - neyshapur - qaen - quchan - sabzevar - sarakhs - tayebad - torbat-jam - torbat-heydarieh - tus

16.Khuzestan (kz)

- ostan-kz - ostan-kz.gov - abadan - ahvaz - andimeshk - baghmalek - behbahan - dezful - izeh - khorramshahr - mahshahr - omidieh - ramhormoz - shadgan - shush - shushtar - susangerd

17.Kohkiluye-Boyerahmad (kb)

- ostan-kb - ostan-kb.gov - basht - charam - dehdasht - dogonbadan - sisakht - yasuj

18.Kordestan (kd)

- ostan-kd - ostan-kd.gov - baneh - bijar - divandareh - kamyaran - marivan - qorveh - sanandaj - saqqez

19.Lorestan (lr)

- ostan-lr - ostan-lr.gov - alashtar - aligudarz - dorud - ezna - firuzabad - khorramabad - kuhdasht - oshtorinan - poledokhtar - zagheh-nurabad

20.Markazi (mr)

- ostan-mr - ostan-mr.gov - arak - ashtian - delijan - khomein - komeijan - mahallat - saveh - shazand - tafresh 

21.Mazandaran (mz)

- ostan-mz - ostan-mz.gov - amol - babol - babolsar - behshahr - chalus - juybar - kelardasht - kiakola - mahmudabad - neka - noshahr - nur - polsefid - qaemshahr - ramsar - ruyan - sari - tonekabon

22.Qazvin (qz)

- ostan-qz - ostan-qz.gov - abyek - avaj - boinzahra - khorramdasht - qazvin - takestan - zia-abad 

23.Qom (qm)

- ostan-qm - ostan-qm.gov - jafarieh - kahak - qom

24.Semnan (sm)

- ostan-sm - ostan-sm.gov - damqan - garmsar - ivanaki - mahdishahr - miami - semnan - shahmirzad - shahrud - sorkheh 

25.Sistan-Baluchestan (sb)

- ostan-sb - ostan-sb.gov - chabahar - fonuj - iranshahr - kenarak - khash - mirjaveh - nikshahr - pishin - qasreqand - saravan - zabol - zahedan

26.Tehran (th)

- ostan-th - ostan-th.gov - damavand - eslamshahr - firuzkuh - hashtgerd - karaj - pakdasht - rey - robatkarim - shahryar - tajrish - tehran - varamin

27.Yazd (yz)

- ostan-yz - ostan-yz.gov - abarkuh - ardekan - ashkezar - bafq - harat - mehriz - meybod - nodushan - tabas - taft - yazd

28.Zanjan (zn)

- ostan-zn - ostan-zn.gov - ab-bar - abhar - khorramdareh - mahneshan - qidar - zanjan - zarrinabad

- famur - gavkhuni - hoz-soltan - khazar - maharlu - namak - neyriz - orumieh - parishan - zarivar

2. Mountains and Peaks کوهستان ها و قله ها

- alamkuh - alamut - alborz - alvand - damavand - dena - karkas - sabalan - sahand - shirkuh - taftan - tangestan - tochal - zagros - zardkuh

3. Rivers رودخانه ها

- aras - atrak - haraz - hirmand - karun - mand - sefidrud - zayanderud

4. Islands جزایر

- abumusa - ashuradeh - hengam - hormoz - khark - kish - lark - qeshm - tonbebozorg - tonbekuchak 

5. Other

- alisadr - alisard - caspiansea - dashtekavir - karaftu - kavir - persiangulf