Why does some cities have 3 digits STD codes?

Question

is there any specialty of the city for having a 3 digit STD code? i is it so that a city must be in the category of metropolis for having a 3 digit STD code?

Answer 1

So I made a low quality version of twenty twenty surgery, guitar, bass and back-up vocals, I kinda guessed all the back-ups, and I can't play drums... but hey if ur a drummer and you like jamming to this song feel free to record along with this, just make sure you send me the file when you're done =P, well anyway I'm looking for a rating on this cover, not the quality but the playing (I used an amp for the recording)... uhmm... and yeah I can't sing that good either... lol, but idc I still do XD... and lastly i don't have a bass, so that's an acoustic guitar with bass effects on it... lol -ENJOY! PLZZ??