Yep. I had to learn our phone number in first-grade - GLendale3 (GL3).I remember when phone numbers were like MurryHill5-1234. And you had a party line.
In about the fourth-grade, something changed with the phone company and it became "453", which is the same thing!
And you are correct, you could tell what neighborhood someone lived in by their phone exchange! All the "rich" kids lived in GLendale1!