The history of the telephone exchange names in Baltimore, as in most significant United States cities, can be divided into three periods:
At this time, I have no information about the Baltimore exchanges in the pre-dial period or the early dial period, and only limited information about the late dial period, mostly derived from one directory (and some of the listings in that directory are not clearly readable), so the data on this site are very limited and incomplete. To access this information click here.
It does appear, from examination of the exchange names that I
have, that Baltimore, like
Washington, D. C., adopted a policy, when the late dial period started, of selecting the office
numbers such that they were equivalent to dialing the third letter
of the exchange name.
Other regional tables:
|The Baltimore-Washington region|
|Baltimore, Md. (city)||Baltimore, Md. (suburban)||Washington, D. C. (city)||Washington (Maryland suburban)||Washington (Virginia suburban)|
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Last modified March 9, 2015.