Current parcel information for properties within Philadelphia County in an interactive mapping interface. Historic Maps feature overlays registry maps so that historic owners may be traced through deed registers.
Once you've found Register, Sheet, and Line numbers as parcel identifiers in DOR Parcel Explorer, you can access PDF-format page images for Philadelphia County deed registers using Penn's subscription to PhilaDox.
Property location, proposed market value, and exemption/abatement information. OpenDataPhilly provides current versions of DOR property parcel shapefiles (updated weekly) and property assessment data (current year and 5-year cumulative).