In 2013, the population of Boston was 645,966. The population has grown 9.6% since 2000. Boston has 13,339 people per square mile. The population is 47.8% male and 52.2% female. The racial breakdown is shown in the Racial Groups table. The people from outside the United States are 178,805. 27.7% of the population come from outside of the United States.