Ethnic Persian (yes, Persians, not Baloch or Kurds or other Iranic people) Sunnis of Iran:
1. Khorassani Persians – The Iranian province of Khorassan in east Iran is home to Khorassani-Persian Sunnis. Even Mashad (which is just next to Neishabur, where Imam Muslim is buried) has a Sunni minority. Some cities in Khorassan of Iran are even majority Sunni (like Birjand and Torbat-e Jam). Khorassani Persians are Hanafi Sunnis and culturally (and of course by language) no different to their fellow Persians in Isfahani, Tehrani, Shirazi etc.
2. Larestani Persians of south Iran who are Shafi’i-Sunnis. Larestan county is locatd in the Fars province (historically ALL of south Iran i.e. what is known today as the southern part of the Fars province and the whole coast line i.e. Hormozgan was known as Larestan). The people in this area refer to themselves as “Khodmooni” (خودموني) or Achomi (اچمی) the former stands for “of our own”/Khodmooni, which is to make themselves distinguished from both Shia Persians and the Arab Sunnis who also live in that area.
Khodmoonis are known of being very proud of their Iranian heritage, to such an extent that many Bastaki (another town in the Larestan area) people for instance emigrated to Dubai, Bahrain, Saudi (especially Khobar) and Kuwait (like many southern Persians did after refusing to pay taxes to Nasir al-Din, the last member of the Qajar dynasty and refusing to give up their Sunni faith when in the 16th history the Turkish Rafidi Safavids started an onslaught and massacre of everything that was Sunni, and even when the killing stopped, still high taxes pushed non-Shia Iranians to migrate) yet despite that, the majority never forgot their origin, in fact there are many Bastakis (and other Larestanis/Khodmunis of course) in Dubai, Bahrain, Kuwait, Qatar, Saudi Arabia and Oman, who have carried their unique Persian culture, language, and architecture with them. They have named their neighbourhood in Dubai, Bastakiyyah, after their town of Bastak in southern Persia, which is to this very day (despite the enmity of the Shia regime) majority Sunni. In fact many high officials in the Gulf, particularly in the UAE are of Persian origin and basically were a main factor for the development of the Gulf states (the biggest businessmen in the UAE are of Larestani-Persian origin).
3. Persian Sunnis of major Shia cities such as Tehran, Tabriz, Isfahan, Shiraz, Hamedan, Arak etc.
There are small Sunni communties in every Shia city of Iran, the Persians among them are either Sunnis by birth (or as it is the case with many, especially in cities such as Tehran and Isfahan) converts from Shi’ism to Islam/Sunnah.