Butler Area Public Library, Butler, Pennsylvania Obituary Index Database
Centre County Pennsylvania Genealogical Society Bible records and 1930 census index online
Chester County Archives and Records Services with a vast collection of indexes: births, marriages and deaths, criminal and prison records, naturalizations, occupation and licensing records, probate, estate and guardianship records and servant and slavery records
Erie County Public Library, Erie, Pennsylvania Obituary Listings
The Green Free Public Library Newspaper Archive Scanned images of six Wellsboro, Tioga County newspapers, from 1838 to 2006
Historical Society of Pennsylvania online catalog, digital history projects and the Pennsylvania Magazine of History Biography
The Lancaster Historical Society with the Columbia Spy newspaper from 1830 to 1889
Land Records at the Pennsylvania State Archives 
Penn State Digital Library Searchable newspaper databases, digital maps collections and the Eighth Air Force Archive
Pennsylvania Archives on fold3 (formerly footnote) Records from 1664 to 1880 include military, tax, marriage, land and historic documents
The Pennsylvania Civil War Collection Penn State’s collection of 11 newspapers published between 1850 and 1870
Pennsylvania State Archives Civil War Veterans’ Card File, 1861 – 1866, World War I Service Medal Application Cards, Revolutionary War Military Abstract Card File and more
Pennsylvania State Historical and Museum Commission Digital Collection finding aids, land records, military records and historical documents
University of Pittsburgh’s Digital Research Library – Historic Pittsburgh includes 500 books from the nineteenth and early twentieth centuries, maps collection, census schedules
Westmoreland County, Pennsylvania marriage license application database back to the late 1800s. Look under e-services, free general public access.