Turkish national censuses do not ask about sectarian or Alevi religious identity, so no official count of the Alevi population exists. Published estimates commonly range from about 10 to 20 percent of the population, a spread wide enough to reflect the absence of a count rather than disagreement over one.
What would resolve this A nationally representative census or independently conducted survey that specifically asks about Alevi self-identification, which the Turkish state census currently does not do.
OpenDemography, religious studiesPew Research Center, Religious Composition of the World, 2010-2020