I find the prefixes are a fascinating bit of US telco history. Many of the exchanges had Names for decades. There's a very interesting back and forth between city geography and these exchange names, both in that a lot of actual location names got embedded into them. I've often sometimes wondered too how often that 1950s-era suburbs picked names simply because they fit the exchange name. I feel like that was an underdocumented homogenization force in American suburb names.

https://en.wikipedia.org/wiki/Telephone_exchange_names