Iraq: 249,000
Like Syria, Iraq has been torn by attacks launched by ISIS, the extremist Islamist group that has captured portions of both countries for what it calls its Islamic caliphate.
Not surprisingly, most of the Syrian refugees have settled in northern areas such as Irbil, Duhuk and Nineveh, which are among the closest to the Syrian border and have large Kurdish populations, the United Nations says.
The notion of Syrian refugees in Iraq may strike some as ironic, if not absurd, because Iraq has deteriorated under sectarian strife and ISIS assaults, producing a sizable population of Iraqi refugees.