The problem is larger than mere displacement, a U.N. news release states, as women are increasingly forced to resort to prostitution and reports of child labor problems are on the rise.

Also, in Syria, where hundreds of thousands of Iraqis are seeking refuge, about 30 percent of Iraqi children are not in school and more than 10 percent of Iraqi families are headed by women.

Many Iraqis were displaced before the United States launched the Iraq war in 2003, but "increasing numbers of Iraqis are now fleeing escalating sectarian, ethnic and generalized violence," according to the Web site of the office of the United Nations High Commissioner for Refugees. (Watch Iraqis struggle to do their jobs amid constant danger )

The office estimates about 1.7 million Iraqis are currently displaced within the country, while another 2 million have fled to neighboring nations. The UNHCR estimates that 2.3 million people will be internally displaced by year's end.

In 2006 alone, almost 500,000 Iraqis fled to other areas inside the country, the UNHCR estimated.

About 300,000 refugees have been displaced both internally and externally just since November, according to UNHCR reports. About 2,000 a day were arriving in Syria and about 1,000 a day were arriving in Jordan, according to a November report.

In a nation of about 26 million, "the current exodus is the largest long-term population movement in the Middle East since the displacement of Palestinians following the creation of Israel in 1948," according to the UNHCR Web site.