Historic sites listed on the Philadelphia Register. Data was updated by the Philadelphia City Planning Commission in July 2017. The public should confirm a property’s historic status by contacting the Historical Commission at 215-686-7660. You can also download a dataset of the [Historic districts](https://www.opendataphilly.org/datasets/philadelphia-registered-historic-districts).

To map older streets with historical value in the City of Philadelphia.

Pittsburgh City Designated Historic Districts

Basemaps of the Philadelphia area, including from the Department of Records.

Founded as William Penn's "Holy Experiment," Philadelphia has a centuries-long history of fostering and constructing prominent houses of worship throughout the city. In recent decades, as congregations face declining membership and shifting neighborhood demographics, these historically- and architecturally-significant properties have often suffered from deferred maintenance, insensitive alterations, and partial or complete demolition. Advocacy organizations like the Preservation Alliance for Greater Philadelphia and Partners for Sacred Places have focused on this issue for years, highlighting the threats to Philadelphia's neighborhoods and communities if these structures continue to be abandoned or lost. Over the summer of 2011, in order to more fully understand and address the issue, the Preservation Alliance partnered with Philadelphia Historical Commission and Partners for Sacred Places to develop a comprehensive index of historic churches covering the entire city. Compiling, verifying, and updating data from a number of different sources, University of Pennsylvania graduate student Molly Lester assembled a database which includes every purpose-built house of worship constructed in the city before 1960. Data elements include: current congregation, original congregation, address, year of construction, original architect and whether or not the build is on the Philadelphia or National Historic Registers.

A mapped dataset and layer of sites and districts identified in the Locational Atlas and Inventory of Historic Sites in Montgomery County, Maryland. The Location Atlas is a list resources that are potentially historic. Resources listed in the Atlas are protected from demolition or "substantial alteration" under Chapter 24A of the County Code. For more information, see http://montgomeryplanning.org/historic/research.shtm. Source: M-NCPPC Planning. https://montgomeryplans.org/arcgis/rest/services/Overlays/HistoricPres_LA_Sites_and_Districts/MapServer/0

Pittsburgh Historic Districts

Web application displaying properties owned by the City, PHDC/RDA or other public entities.