The U.S. government estimates the total population at 37.7 million (midyear 2020 estimate). According to the 2011 census, which has the most recent data available on religion, approximately 67 percent of the population self-identifies as Christian. Roman Catholics constitute the largest Christian group (38 percent of the total population), followed by the United Church of Canada (6 percent), Anglicans (5 percent), Baptists (1.9 percent), and Christian Orthodox (1.7 percent). Presbyterian, Lutheran, and Pentecostal groups each constitute less than 2 percent of the population. The Church of Jesus Christ of Latter-day Saints estimates its membership at 199,000. The Fundamentalist Church of Jesus Christ of Latter-day Saints (FLDS Church) estimates its membership at 1,000. The Hutterites, or Hutterite Brethren, numbering approximately 35,000, are an Anabaptist ethnoreligious group living primarily in Alberta, Manitoba, and Saskatchewan Provinces. Approximately 3 percent of the population is Muslim, and 1 percent is Jewish. Buddhists, Hindus, Sikhs, Scientologists, Baha’is, and adherents of Shintoism, Taoism, and aboriginal spirituality together constitute less than 4 percent of the population. Approximately 24 percent of the population lists no religious affiliation.

The U.S. government estimates the total population at 38.9 million (midyear 2019 estimate). According to 2010 government statistics – the most recent available – 97 percent of the population is Muslim. Shia Muslims, predominantly Arabs but also including Turkoman, Faili (Shia) Kurds, and others, constitute 55 to 60 percent of the population. Sunni Muslims are approximately 40 percent of the population, of which Arabs constitute 24 percent, Kurds 15 percent, and Turkomans the remaining 1 percent. Shia, although predominantly located in the south and east, are the majority in Baghdad and have communities in most parts of the country. Sunnis form the majority in the west, center, and north of the country.

According to Christian leaders as well as NGO and media reports, fewer than 250,000 Christians remain in the country, down from a pre-2002 population estimate of between 800,000 and 1.4 million persons. Approximately 67 percent of Christians are Chaldean Catholics (an eastern rite of the Roman Catholic Church), and nearly 20 percent are members of the Assyrian Church of the East. The remainder are Syriac Orthodox, Syriac Catholic, Armenian Catholic, Armenian Apostolic, Anglican, and other Protestants. There are approximately 2,000 registered members of evangelical Christian churches in the IKR, while an unknown number, mostly converts from Islam, practice secretly.

Yezidi leaders continue to report that most of the 400,000 to 500,000 Yezidis in the country reside in the north, with approximately 200,000 to 230,000 remaining displaced as of October 2020. The Shabak number between 350,000 and 400,000, three-fourths of whom are Shia. Most Sunni Shabak and some Shia Shabak reside in Ninewa. According to Kaka’i (also known as Yarsani) activists, their community has approximately 120,000 to 150,000 members located in the Ninewa Plain and in villages southeast of Kirkuk as well as in Diyala and Erbil. Estimates of the size of the Sabean-Mandean community vary, but according to Sabean-Mandean leaders, 10,000 to 15,000 members remain in Iraq, mainly in the south, with between 750 and 1,000 in the IKR and Baghdad. Armenian leaders report a population of approximately 7,000 Armenian Christians, both Armenian Apostolic Church (Armenian Orthodox) and Armenian Catholic. Baha’i leaders report fewer than 2,000 members, spread throughout the country in small groups, including approximately 500 in the IKR.

There are fewer than six adult members in the Baghdad Jewish community, according to a local Jewish community leader. In the IKR, there are approximately 80 Jewish families, according to the KRG international advocacy coordinator, although some Jewish families do not openly acknowledge their religion for fear of persecution, according to the KRG Ministry of Endowment and Religious Affairs (MERA) and NGO sources, and the number could be higher. According to the KRG MERA, there are approximately 60 Zoroastrian families in the IKR. Zoroastrian sources report there are approximately 20,000 to 25,000 Zoroastrians in the country.

According to the International Organization for Migration (IOM), approximately 1.2 million persons remain displaced within the country, predominantly in Ninewa, Dohuk, Erbil, Sulaymaniyah, and Kirkuk Governorates, compared with 1.5 million persons at the end of 2019. According to the KRG’s Joint Crisis Coordination Center, there are approximately 700,000 internally displaced persons (IDPs) in the IKR. Forty percent of IDPs throughout the country are Sunni Arabs, 30 percent Yezidis, 13 percent Kurds (of several religious affiliations), and 7 percent Christians. Other religious minorities comprise the remaining 10 percent.

According to the IOM, there were more than 205,000 IDPs in camps and approximately 104,000 in critical shelters throughout the country at year’s end.