Exact data regarding the number of Palestinian forced to leave the city since June 1967 are not available. Based on a sample study conducted in 1993, Dr. Bernard Sabela, political scientist at the Bethlehem University, estimates the numbers as following: 
16,917 - who emigrated abroad since 1967 
12,080 - who emigrated to outside the municipal boundaries 
12,500 - who currently live in the North Jerusalem area (inside the boundaries of the  pre-1967 
             Jerusalem, but excluded by the Israeli authorities) 
  7,630 - who were outside the country in 1967 and therefore never issued Israeli IDs 

A total of 49,127 Palestinian Jerusalemites (31,5% of Jerusalem residents) are currently emigrants living outside the country or living here outside the municipal boundaries. THIS FIGURE DOES NOT INCLUDE THEIR FAMILY MEMBERS! 
Other estimates are much higher. The AIC-Project for Palestinian Residency & Family Reunification is currently making an attempt to obtain official data from the Jerusalem Interior Ministry.