The U.S. government estimates the total population at 19.3 million (midyear 2020 estimate). At year’s end, more than half of the country’s prewar population was displaced; there were approximately 5.6 million refugees registered with the Office of the UN High Commissioner for Refugees in neighboring countries as well as 6.6 million IDPs. Continued population displacement adds a degree of uncertainty to demographic analyses, but the U.S. government estimates 74 percent of the population is Sunni Muslim, which includes ethnic Arabs, Kurds, Circassians, Chechens, and some Turkomans. According to U.S. government estimates, other Muslim groups, including Alawites, Ismailis, and Shia, together constitute 13 percent of the population, while Druze constitute 3 percent.

The U.S. government estimates 10 percent of the population is Christian. However, there are reports that indicate that number was considerably lower – approximately 2.5 percent. Of the 1.5 million Christians who lived in the country prior to the war, it is estimated that only approximately one-third of them – or approximately 450,000 – remain. Before the civil war, there were small Jewish populations in Aleppo and Damascus, but in June, the Jewish Chronicle reported that there were no known Jews still living in Syria. There was also a Yezidi population of approximately 80,000 before the civil war.

Sunni Muslims are present throughout the country. Shia Muslims live mostly in rural areas, particularly in several majority-Shia towns in Idlib and Aleppo Governates. Twelver Shia Muslims generally live in and around Damascus, Aleppo, and Homs. The majority of Alawites live in the mountainous areas of the coastal Latakia Governorate, but they also live in the cities of Latakia, Tartous, Homs, and Damascus. The highest concentration of Ismaili Muslims is in the city of Salamiyeh, Hama Governorate.

Most Christians belong to autonomous Orthodox Churches, Eastern Catholic Churches, or the Assyrian Church of the East and other affiliated independent Nestorian Churches. Most Christians continue to live in and around Damascus, Aleppo, Homs, Hama, and Latakia, or in the Hasakah Governorate in the northeast of the country. While there were hundreds of thousands of Iraqi Christian refugees before the conflict, the majority of the Iraqi Christian population has moved to neighboring countries or returned to Iraq. Many Druze live in the Jabal al-Arab (Jabal al-Druze) region in the southern Sweida Governorate, where they constitute a majority of the local population. Yezidis previously lived in Aleppo, but now live mainly in northeast Syria areas controlled by Kurdish-led Syrian Democratic Forces (SDF).