How would an American native speaker  refer to someone whose house is located in a bad part of town where some poor people with a lower social / cultural level live  and where  the dwellers' average income is usually too low in comparison with the people who live in posh districts of the town?

I have found some words and expressions which can be used in a sentence which I'm going to say, but I doubt if they are unnatural, old-fashioned etc.

> - He/she lives in a *working class neighborhood*.
> - He/she lives in a *bad part of* town.
> - He/she lives in *boondock*s.
> - He/she lives in *boonies*.
> - He/she lives in *projects*.

I was wondering if you could let me know if they do not work properly, how a native would indicate such a message?