Kinga Wysienska-Di Carlo and Matthew Di Carlo::

A large and long-standing body of research documents the segregation of U.S. schools by race and income, but relatively few of these studies include private schools. This is partially because of the lack of data on private schools, and also because most desegregation efforts have focused on public schools.

That said, private schools serve roughly one in ten of the nation’s school children, with higher proportions in many big cities. Attempts to describe school segregation without including private schools may therefore be missing a significant part of the picture.