I have just started putting the Cemetery Records for St. Mary's Church in Philadelphia PA online. The records go from 1788 to 1800.
St. Mary's, built in 1763, was the second Roman Catholic institution in Philadelphia. It was the site of the first public religious commemoration of the Declaration of Independence. Members of the Continental Congress attended
services four times from 1777 to 1781. George Washington worshiped at St. Marys on at least two occasions.
You can start at PENNSYLVANIA GENEALOGY LINKS at
Choose "Search online Pennsylvania Databases" then look under CEMETERY RECORDS. Click on the link for St. Mary's Church Burial Ground, Philadelphia Pennsylvania to begin.
To see the Pew Rentals 1787-1791 List of Names, go to http://www.rootsweb.com/~ote/usa_genealogy/pa_stmarysintro.htm
It may be easier to start at
Choose "Search online Pennsylvania Databases", then click on Church Records - Pew Rentals 1787-1791 St. Mary's Church, Philadelphia Pennsylvania