When you need to apostille a Pennsylvania marriage certificate, you will need to make sure to have a certified copy of the vital record beforehand. If you need to order one, your best bet is to go through the State Library of Pennsylvania. Here's what their website says about obtaining one:
Since September 30, 1885, marriage licenses have been required in Pennsylvania and are maintained by the Marriage License Clerk in the county courthouse of the county issuing the license. Before September 30, 1885 the issuing of licenses was not obligatory, but was intended for those cases where the banns were not published or the marriage in church was dispensed with. For these earlier marriages, church records and newspapers may provide information.
Apostille for Pennsylvania Marriage Certificate There is no margin for error with the Authentication or Apostille process. If mistakes are made, both your time and money will be wasted and you'll have to start all over again. If you want to look into outsourcing this part of preparing to studying abroad to someone with experience, please email me at firstname.lastname@example.org or call 848-467-7740 to request my services or learn more.