The country's immigrant population may have dropped by roughly 2 million people in the first six months of the year, according to new government data. The new data offer an early – if imperfect – ...

Andrew J Tatem works for the University of Southampton, and is Director of WorldPop. His research on mapping populations has been funded by donors such as the Gates Foundation, Wellcome Trust, GAVI.

Pennsylvanian has hit a tipping point in the age of its population, according to new data released from the U.S. Census Bureau. The state joins 10 others that have more senior citizens than children ...