Is there a website that shows a comprehensive list of star wars planets and planet data like population.. Sector.. Ect?
Website showing planets and populations
It might not be organized the way you'd like it to be, but most of that information should be available on Wookiepedia.
Canon...
http://starwars.wikia.com/wiki/List_of_planets
Legends (broken down into 26 pages by first letter)...