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Not the best part of Union City, to be completely honest. It borders Jersey City heights. Things look a bit more run down in Union City the further downtown you go. I would aim for a place north of 15th st if I were you. New York Ave has jitney buses that run at all hours so even if you don't drive, getting to places should be a breeze.
That said, it's probably not anymore unsafe than any other part of UC so if you must live there I'm sure you'll be ok.