The Equal Justice Initiative has documented 4,000 lynchings in the South between 1870 and 1950. This resource is potentially useful for examining out-migration of blacks, particularly men, from the South during this era. It could also be useful for explaining current race-based inequalities, including incarceration.
Lynching in America: Confronting the Legacy of Racial Terror
Summary Report | Equal Justice Initiative
Supplement: Lynchings by County [pdf only]
Note that the graphic by the New York Times has a time-dimension in it. I am awaiting the full report from the Equal Justice Initiative to see what additional detail is available in it.
Press Coverage [scroll down]