The population of the city of Paris was 2,125,246 at the 1999 census, lower than its historical peak of 2.9 million in 1921. The city’s population loss mirrors the experience of most other core cities in the developed world that have not expanded their boundaries. The principal factors in the process are a significant decline in household size, and a dramatic migration of residents to the suburbs between 1962 and 1975.
Factors in the migration include de-industrialisation, high rent, the gentrification of many inner quarters, the transformation of living space into offices, and greater affluence among working families. The city’s population loss was one of the most severe among international municipalities and the largest for any that had achieved more than 2,000,000 residents. These losses are generally seen as negative for the city; the city administration is trying to reverse them with some success, as the population estimate of July 2004 showed a population increase for the first time since 1954, reaching a total of 2,144,700 inhabitants.