Chicago telephone exchanges, prior to September 18, 1948

The tables that this page leads to give the exchanges in use in the city of Chicago, Ill. for the period between the start of dial-oriented listings and September 18, 1948, when Chicago telephone numbers were changed from three-letter to two-letter-one-digit exchanges. For the exchanges after 1948, please see the section of this website devoted to the post-1948 Chicago exchanges.

Alphabetic table of exchange names
Numeric table of exchange names

Main Chicago page
Chronological periods of the Chicago data:
Pre-dial period Early dial period Late dial period

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Last modified September 16, 2015.

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