I've been a Comcast customer in Philly, Boston, and Chicago. Philly -- take your normal channel, add 800 to it, and it mostly kinda works. All sports channels are clumped in a tight bunch, which is a huge help. Boston, add 700 and it kinda works, too, though the sports channels could be tightened up.
Chicago, good luck! No rationale or forethought, utter randomness. I got so frustrated that my folks were still watching in SD on their new HD TV that I made an HD "conversion chart." Laminated that jammy, too!
How could there not be a more consistent best-practice sharing across markets?