Fifty-two cities have experienced population decline since 2000
In some cities, population decline occurred in response to a natural disaster. This has been the case, for example, in New Orleans, United States, which lost population after Hurricane Katrina in 2005, and in Sendai, Japan, following the 2011 earthquake and tsunami.
Economic contraction has also contributed to population decline in some places. For example, Buffalo and Detroit, both located in the United States, experienced population decline associated with the loss of industry and jobs.
In most cases, however, declining or stagnating populations have been associated with persistent low fertility rates, particularly in Europe. The 52 cities with declining populations were home to 59 million people in 2018, down from more than 62 million in 2000.