Jeffrey S. Passel

The largest wave of immigration in history from a single country to the United States has come to a standstill.

The U.S. population in 2010 included 39.9 million foreign-born residents. This estimate, the latest available for the foreign-born population, is 1.5 million, or 4%, higher than the survey’s 38.5 million estimate in 2009.

Barely half of all adults in the United States—a record low—are currently married, and the median age at first marriage has never been higher for brides and grooms.

Nearly two-thirds of the 10.2 million unauthorized adult immigrants in the United States have lived in this country for at least 10 years and nearly half are parents of minor children.

The 2010 Census counted 50.5 million Hispanics in the United States, making up 16.3% of the total population. The nation's Latino population, which was 35.3 million in 2000, grew 43% over the decade.

The number of Hispanics counted in the 2010 Census was nearly 1 million more than expected, based on the most recent Census Bureau population estimates.

The number of Hispanics counted in the 2010 Census has been larger than expected in most states for which the Census Bureau has released detailed population totals so far, with the widest gaps in states with relatively small Hispanic populations.

The annual inflow of unauthorized immigrants to the U.S. was nearly two-thirds smaller in the March 2007 to March 2009 period than it had been from March 2000 to March 2005.

An estimated 340,000 of the 4.3 million babies born in the United States in 2008 were the offspring of unauthorized immigrants, according to a new analysis of Census Bureau data.

This dramatic increase has been driven in part by the weakening of longstanding cultural taboos against intermarriage and in part by a large, multi-decade wave of immigrants from Latin America and Asia.