Interesting query from friend: how many Sunni Iranian Americans are there? My calculation:
About 10% of Iran is Sunni, but that is because of ethnic Turks, Arabs, and Afghans in the country. There are maybe at most 500K Iranian Americans in the US today. A 2012 Zogby poll estimates that only 31% of Iranian Americans are Muslim! If we preserve the shia-sunni ratio in Iran, that means around 10K Sunni Iranian Americans. Probably fewer since, again, in Iran, other ethnicities make up the majority of the Sunni demographic.