Since most stuff is already familiar and well known, it doesn't need to be created again. You don't need populastion numbers for settlements, lists of shops, and what you can buy there. You don't even have to look it up, because you already have a good idea what things are possible and which things are not.
Maybe have a stat block for generic street cop and stats for SWAT teams if you ever run into situations where you need them, but that's really all the stats you need for NPCs that are not relevant to the plot or supposed to be enemies. If you absolute have to have stats for a random person, just use the stats for a standard human without any special abilities.
You need NPCs and monsters, everything else can easily be done on the fly, since everyone knows how all the other stuff would look and work like.