You have to remember this is Maine. We could probably have 3-digit numbers, but it would look bad. When I was a kid we had 5-digit phone numbers. But, it was made up for by rotary dialing. If you met a girl and her number was something like 320-0059, you just moved on. Too long to dial her number.
Teenagers today would be astounded. We had one rotary dial telephone in the kitchen. That was it. We all shared it. Sure, you could text from it, but we didn't know it. Our phone number was the first one I remember. To this day, it is the only phone number I remember before moving here. I use it in many of the security questions. There was one other I had in Gainesville, Florida I remember, but only because it was 371-3784 or 371-DRUG. Gainesville -- University of Florida -- 371-drug. Can't beat that.
