Pennsylvania 6-5000 was released in 1940 with music by Jerry Gray and lyrics by Carl Sigman. PEnnsylvania 6-5000 (note the initial two capital letters) was a New York City telephone number from the 1930s to 60s. This song was featured in an episode of American Dad. and Season 18, Episode 4 of Family Guy.

The name is a reference to early phone numbers, which were given as a combination of 2 letters and 5 numbers. The Hotel Pennsylvania in NYC was a venue for many acts at the time, including Glenn Miller and his band. The area surrounding Penn Station was given the letters PE for their phone number. The Hotel’s phone number was (and still is) PE-6-5000 or PEN-5000.