Fons Cuppen pointed out that I had assigned Al Qabil district to Ash Sharqiyah South governorate, but it belongs in Ash Sharqiyah North. The table below has been corrected.

Sorin Cosoveanu sent me a pdf copy of the 2010 census report. While reconciling it with the data previously shown here, I found that I had made a few mistakes when I first posted this page in 2004. In Al Batinah region, there was apparently a problem with column alignment. Wadi Al Maawil got split into two apocryphal districts, Wadi and Al Maawil. The right populations were attributed to the wrong districts in three cases, including one where the total population of the region was attributed to Barka district. Something similar happened in Musandam governorate, where Daba Al Bayah got separated into Daba and Al Bayah. The table for 2003 in the Change history section has corrected data. Where the population and the district name were in disagreement, the HASC code stayed with the name. As a result, the codes OM.BA.MA and OM.MU.BA are now decommissioned.

Change history:

1. There were 37 districts in 1977, 41 in 1988, 59 in 1996.
2. Morris Fisher, in the 1985 edition of his book "Provinces and Provincial Capitals of the World", reports these 37 wilayat: Adam, Al Khabura, Al Masanaa, Al Mudaibi, Al Mudhayrib, Awabi, Bahla, Barka, Bid Bid, Biddiya, Bilad Bani Bu Hassan, Birkat al Mawz, Bukh, Buraymi, Dank, Dibbah, Ibra, Ibri, Izki, Jalan and Bilad Bani Bu Ali, Kamil and Wafi, Khasab, Liwa, Mahadhah, Manah, Nakhl and Wadi Maawal, Nizwa, Quriyat, Rustaq, Saham, Shinas, Sohar, Sumail, Sur, Suwaiq, Wadi Bani Khalid, and Wadi Dimma. (The capital usually has the same name as the wilayah; omit the words in green to get the capital name in the exceptional cases.) He implies that Muscat federal capital municipality and Dhofar federal province don't have any wilayat.
3. This was the situation at the time of the 2003 census:

1. 2006-10: Al Buraymi province split from Adh Dhahirah region. In it, As Sunaynah district formed by taking parts of Al Buraymi and Mahdah districts. Al Mazyunah district created in Dhofar governorate.
2. 2011-10-28: Al Batinah region split into Al Batinah North and Al Batinah South governorates. Ash Sharqiyah region split into Ash Sharqiyah North and Ash Sharqiyah South governorates.

Other names of subdivisions:

1. Al Amrat: Al Amerat (variant)
2. Al Buraymi: Al Buraimi (variant)
3. Al Jazer: Al Jazir (variant)
4. Al Kamil Wa Al Wafi: Al Kamil W’al Wafi (variant)
5. Al Khaburah: Al Khabourah (variant)
6. Al Mudaybi: Al Mudhaibi (variant)
7. Al Musanaah: Musannah (variant)
8. Al Qabil: Al Kabil, Al Qabel (variant)
9. Ar Rustaq: Al Rostaq (variant)
10. As Suwayq: Al Suwaiq (variant)
11. Bawshar: Baushar (variant)
12. Bidiyah: Bidiya (variant)
13. Daba: Diba, Daba al-Bayah (variant)
14. Dank: Dhank (variant)
15. Dama Wa At Taiyyin: Dima Wa Attaiyyin, Dima W’attayeen (variant)
16. Hayma: Haima (variant)
17. Jaalan Bani Bu Hasan: Jaalan Bani Bu Hassan (variant)
18. Mahadah: Mahdah, Mahdha (variant)
19. Mahawt: Mahout, Muhut (variant)
20. Mutrah: Muttrah (variant)
21. Nakhal: Nakhl (variant)
22. Qurayyat: Qurrayat (variant)
23. Sadah: Sadh (variant)
24. Samail: Samayil (variant)
25. Yanqul: Yankul (variant)