The Philadelphia Register of Historic Places is an inventory of properties that have been designated as historic by the Philadelphia Historical Commission. Today, all properties go through a nomination process before being added to the register.

The register is split into three documents that include:

• Properties with OPA-compliant addresses. These properties have official addresses that are recognized by the Office of Property Assessment (OPA), such as 237–49 Arch Street.
• Properties without official addresses, such as the Valley Green Inn. These properties instead use approximate addresses.
• Public interiors, objects, structures, and sites. For example, the Grand Court of the Wanamaker Building interior.

You can also search a map of places listed on the register.