Halo worlds

Most human colonies were small, populated by well under a million people, while a few were very large, with a population in the hundreds of millions.




Prior to the start of the war with the Covenant, humanity had established colonies on around 800 separate worlds.  The war took a massive toll on human colony worlds, particularly those in the outer colonies.  By 2536, most outer colonies were destroyed, leaving only a handful of small colonies to fend for themselves.  Of those, only an even smaller few managed to survive the war unscathed.