I live in the US. I need a passport but I am a citizen of Portugul. Where can I get this.

If you are not a citizen of the US and live there, you had better already have one. Or you are in the country illegally.

So exactly how are you in the US, what is your "status" How did you get in the US, is your current passport and visa expired ?

These are important questions

And I might add, since you did not specify, if you are not a US citizen already. You will not get a US passport.

As Fr_Chuck has pointed out...your status here IS very important.