OK, I'll play. Post 9 is the only one close. Post 7 sorta. Then post 11.
When homes only had one phone regardless of the number of people who lived there, it was a lot easier for phone numbers to mean something. All connections in given areas came from the same switching office. Those offices were named, usually for the street they were located on, but sometimes for other things or people.
In Detroit for example, you might have had Woodward, Kenwood, Delray and Vermont among many others.
For simplicity in many ads, you'd see something like WO6-7394, KE2-3114, DE2-8003 or VE9-6128.
It would be the same as:
WOodward6-7394
KEnwood2-3114
DElray2-8003
VErmont9-6128.
or:
966-7394
532-3114
332-8003
839-6128.
Letters corresponded to the numbers on the keypad
1
2 ABC
3 DEF
4 GHI
5 JKL
6 MNO
7 PRQS
8 TUV
9 WXYZ
1 was reserved for long distance calling.
Rural areas with less population that didn't have party lines had less digits, like
