Again, like most of the other primaries, Pennsylvania apportions their delegates by both Congressional district and by state-wide percentages.  There will be 161 delegates determined, in some way, by the primary contest on April 22nd.  The largest group, 103 delegates, will be determined by vote totals in each of the 19 congressional districts of Pennsylvania.  There will be another 35 delegates that will be determined strictly by the state-wide vote on April 22nd.  Finally, there will be 20 pledged elected officials (PLEO's) that will also be determined by the state-wide vote and 3 unpledged add-ons split 2-1 depending on the primary vote.

Obviously, the big portion of the delegates will be determined by the vote breakdown in each of these 19 districts.  Again, much like Texas, the delegate amounts in each district is determined by the Democratic turnout in previous elections.  They range from a low of 3 delegates in the solidly Republican 9th district to a high of 9 delegates in the 2nd district (Chaka Fattah's district).  Here is the list of delegates per Congressional district.

There's more...