The tables that this page leads to give the exchanges in use in New York City after December 1930, when the format of telephone numbers changed from three letters and four digits (three-letter exchange names) to two letters and five digits (two-letter-one-digit exchange names). For the exchanges prior to December 1930, please see the section of this website devoted to pre-1930 New York City exchanges.
I have had the good fortune to be able to examine a lot of microfilms of old directories, spaced closely enough in time to be able to follow the start and end dates of many exchanges in New York City. (So far, only the borough of Manhattan, but I hope to expand the charts on this site.) With this information, the start and end dates of many exchanges can be determined to within approximately six months for many exchanges. In fact, for exchanges started or ended in the first few years of this era, even finer distinctions are possible.
Each directory (except for some of the earliest in this set) can be characterized by two dates: the cover date, which may be a month like "May 1948," a two-season range like "Fall-Winter 1946," or a phrase such as "1939 issue" (understood as meaning the start of the named year), and the "corrected-to" date, shown on the inside as a precise date, usually about two months prior to the cover date. The "corrected-to" date is likely to be a more accurate characterization, but I have presented both in the chronological charts on the site.
Additional information in these tables comes from my own memory, but in addition a large amount of data comes from the comprehensive telephone exchange database maintained by Robert Crowe. Originally I began this site using a table prepared by Hugh Hamilton (available on The Telephone Exchange group on Yahoo!) of the exchanges at the time of the 1930 change. However, as my research proceeded, a large number of errors were found in Hamilton's table:
This section is organized in the same way as is each geographical section of this site: by exchange. There are four tables, which can be described as alphabetical, numeric, alphabetical/numeric, and chronological:
|Alphabetic table of exchange names|
|Numeric table of exchange names|
|Alphabetic/Numeric table of exchange names|
|Chronological table of changes in exchange names|
|New York City:|
|Main New York City page|
|Chronological periods of the New York City data:|
|Pre-dial period||Early dial period||Late dial period|
|The New York greater metropolitan area|
|The Northern 914 Area||Southern Westchester County||Western Long Island||Eastern Long Island|
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Last modified June 7, 2011.