Aren't most Erdogan-supporters members of the Turkish diaspora in Europe, rather than being in Turkey proper?
Erdogan is immensely popular amongst poorer, religious, working class people. His strongholds are predominantly in the more (economically) backwards Central and Eastern Anatolia (except for Tunceli, only Alevi majority province)
The CHP (Kemalists, secular nationalists, sometimes dubbed social democrats) are usually the upper class, higher educated people living in Izmir, Istanbul and the West Coast. Has been infiltrated by globohomo
The majority of the Kurds vote for the leftist HDP (political front for the PKK). Religious Kurds (Hezbollah movement) usually vote Erdogan.
The MHP doesn't show up in these maps but they are the ultra-nationalists. Think Grey Wolves, Turanic myths and some old fashioned skull measuring
Turkish 2014 Presidential election results
Turkish 2018 presidential election results
Voting patterns of eligible Turkish citizens living abroad
Download scientific diagram | Variables. from publication: How do Turks abroad vote? | Voting rights are an essential feature of democratic citizenship. Turkey enfranchised its expatriate citizens in 1995, but they were first granted the right to vote from overseas in the 2014 presidential...