In 1950, the United States had a population of 151,325,798 as recorded in the federal census undertaken in that year. The population per square mile was 42.6, while the total population increased by 14.5 percent in the 10-year period between 1940 and 1950.
The five most populous cities at that time were New York City, Chicago, Philadelphia, Los Angeles and Detroit. New York City had a population of nearly 8 million in 1950, while Chicago had 3.6 million residents. Philadelphia and Los Angeles both had around 2 million. Baltimore, Cleveland, St. Louis, Washington, D.C., and Boston were also among the 10 most populous American cities.