[Commercial Exchange] (1875) Local ID #: Westcott1875-143 Westcott, Thompson. The Official Guide Book to Philadelphia. Philadelphia: Porter & Coates, 1875., p. 143

Overview

• Building Type: office building
• Client: Keystone Telephone Co.

Location

135-139 S 2ND ST Browse this block
Philadelphia, PA

> Search near this location

> View location in Google Maps

Historic Registrations and Surveys

• HABS (Historic American Building Survey): PA-1406
• Philadelphia Register of Historic Places

Comments

World's first automatic telephone exchange (1902-1944)

Links to Other Databases

• Historic American Buildings Survey (HABS): PA-1406
• PHMC Cultural Resources Database
• PhillyHistory.org - find historic photos near this building

Philadelphia Architects and Buildings | About | Participating Institutions | Feedback | Search | Login
Website and System: Copyright © 2026 by The Athenaeum of Philadelphia.
Data and Images: Copyright © 2026 by various contributing institutions. Used by permission.
All rights reserved.