I used to work in a factory several years ago, but I don't miss it now. Do you work in a factory?
A little over a decade ago I worked in a factory producing electric motors. Where I am from we call them "plants"
Yes, that's another word for them around here too. Guess it depends on who's talking about them. 
Our area has many different factories. Nuclear, chemical, and paper in a 50 mile radius. Those are just a few of the larger ones.