UNHCR Office of the United Nations High Commissioner for Refugees [to 11 July 2015]
http://www.unhcr.org/cgi-bin/texis/vtx/search?page=&comid=4a0950336&cid=49aea93a7d&scid=49aea93a40

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UNHCR: Total number of Syrian refugees exceeds four million for first time
9 July 2015
The number of refugees fleeing the conflict in Syria to neighbouring countries has now passed four million, confirming that crisis as the world’s single largest refugee crisis for almost a quarter of a century under UNHCR’s mandate.

New arrivals in Turkey and updated data from the Turkish authorities on refugees already in that country have taken the total number of Syrian refugees in neighbouring countries to more than 4,013,000 people.

Furthermore, at least an additional 7.6 million people are displaced inside Syria – many of them in difficult circumstances and in locations that are difficult to reach.
“This is the biggest refugee population from a single conflict in a generation. It is a population that needs the support of the world but is instead living in dire conditions and sinking deeper into poverty,” said UN High Commissioner for Refugees António Guterres.

Tragically, and with no end in sight to Syria’s war, now in its fifth year, the crisis is intensifying and the number of refugees are rising. The four million milestone comes barely 10 months since the total of three million was reached. At current rates, UNHCR expects the figure to reach around 4.27 million by the end of 2015.

“Worsening conditions are driving growing numbers towards Europe and further afield, but the overwhelming majority remain in the region,” Guterres added. “We cannot afford to let them and the communities hosting them slide further into desperation.”

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Kelly T. Clements becomes UN Deputy High Commissioner for Refugees
6 July 2015