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City of Philadelphia

Property Assessment Data

Property Assessment Methodology

The Office of Property Assessment's presentation describes the key steps and processes taken to estimate real property values for tax purposes for single family residential properties

Geographical Market Areas (GMAs)

As part the process for determining property values, the OPA reviews sales data to identify pockets of real estate activity where similar properties are selling for similar prices. More specific than neighborhood breakdowns, the OPA calls these GMAs and there are over 600 of them. View the GMA maps for the city of Philadelphia.

Property Assessment Data

A CD containing more extensive property data is available for purchase from the OPA. A data dictionary (metadata) accompanies the CD. All files are formatted as comma delimited text. This data is also available as a free download on as well. To download: please visit

You may purchase the OPA's property CD by sending your request, on your letterhead (along with a check in the amount of $100 made payable to the "City of Philadelphia") to:
             City of Philadelphia
             Office of Property Assessment/IT Division
             Curtis Center
             601 Walnut Street, Suite 300 West
             Philadelphia, PA 19106

You can also submit your request through the OPA’s Customer Service Center.


A selection of terms relating to Assessments.

  • Assessment Date
  • Assessment Equity
  • Assessment Progressivity (Regressivity)
  • Assessment Ratio
  • Assessment Ratio Study
  • Geographical Market Area (GMA)
  • Level of Assessment; Assessment Ratio
  • Reappraisal
  • Reappraisal Cycle
  • Reassessment
  • Reevaluation
Full Glossary