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.