demographics the 2010 united states census reports the following demographics for mount joy borough : total population : 7,410 male : 3,624 female : 3,786 hispanic or latino : 549 white : 6,809 african american : 187 asian : 58 american indian and alaska native : 20 identified by two or more : 170 public services museums and historic sites and central hotel donegal mills plantation george brown 's sons cotton and woolen mill nissly swiss chocolate company notable people david salsbery fry , metropolitan opera bass .