Telephone exchange names often provide a historical, memorable, and even nostalgic context, personal connection, or identity to a community. They can therefore often be found in popular culture, such as music, art, and prose.
At least four popular songs use old telephone exchanges in their names:
"PEnnsylvania 6-5000" (PE 6-5000), recorded by Glenn Miller (the inspiration for that song, the Hotel Pennsylvania in New York City, still holds that phone number as +1-212-736-5000);
"BEechwood 4-5789", by The Marvelettes; "LOnesome 7-7203 by Hawkshaw Hawkins;
"ECho Valley 2-6809" by The Partridge Family.
PEnnsylvania 6-5000 was later spoofed in the Bugs Bunny cartoon Transylvania 6-5000 and the horror/comedy film Transylvania 6-5000.
The title of BUtterfield 8, the 1935 John O'Hara novel whose film adaptation won Elizabeth Taylor an Academy Award for Best Actress, refers to the exchange of the characters' telephone numbers (on the Upper East Side of Manhattan).
Radio show Candy Matson, YUkon 2-8209 first aired on NBC West Coast radio in March 1949.
Another movie title based on these types of phone exchanges is director Henry Hathaway's "Call Northside 777" (1948), starring Jimmy Stewart.
https://en.wikipedia.org/wiki/Telephone_exchange_names#In_popular_culture
In Ziegfeld Girl, Edward Everett Horton makes a sly reference to elevator operator Lana Turner that the Follies was her opportunity to move up in the world with a BUtterfield phone number.