I know as women, we have  mixed feelings if we let the strangers in to our house, but the guy from census I referred to was only contented of making his interview just at my doorstep. And aside showing me his ID, he also posted sticker on the front entrance of our building. (probably for housing/zoning purposes).

well nadt, it's not being a paranoid, that's a normal reaction especially meeting strangers at your home. And we should also be careful of who we welcome to our house.

Yes, alexa, we should use our common sense. If we sense something fishy, think quickly!