As to non-Bell telephone companies, Rochester NY was separate from Ma Bell, until the Bell breakup, I believe.
From that retro Keystonetelephone.com, special numbers link: Interesting how Keystone had a special 3 digit emergency number, and it happened to be 911 backwards. As a kid I just knew to dial O for operator in an emergency.
Also for some stupid reason I remember 113 was a special number on our own phone system, but now, I have no clue what that number was even for! Did some areas have several 11x special numbers?