| This table is now as complete as it can be made based on the information available in the Library of Congress' microfilm collection. Any errors and omissions are no doubt due to defective copies of the directories or errors in the original directories which were the sources for the information. If you are in possession of information that would be useful for correction of this page, please e-mail corrections to me on those points. |
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The following table lists exchange names used in New York before December 1930, when the format of telephone numbers changed from three letters and four digits to two letters and five digits. They are ordered by the numeric equivalents of the three- letter prefixes. (For a table with the exchanges ordered alphabetically by exchange name, click here.)
Prior to the December 1930 changes, telephone exchanges in Staten Island were not dialable from the rest of New York City and so are not listed in this table. These exchanges became dialable with the normal two-letter pattern upon the December change.
The primary table for this era is the one ordered by exchange name, which contains more information on each exchange than is given here. To see the table entry for any exchange name in that table, click on the name. In particular, that table shows the correspondence between these pre-1930 three-letter exchanges and the post-1930 exchanges that used two letters and 1 digit in the exchange part (two letters and five digits for the whole telephone number).
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Last modified October 20, 2010.