Can i use my white card from out of state

Yes

Yes you can. Here is the official website rule: Your membership card is valid at any Costco warehouse worldwide and is not transferable.

My mom has Costco here and when she goes to Mexico they accept it and vice versa, my friend from there comes over and they accept it here, the white card I think you are referring to.

Yes, Costco is very consistent.. 👍

idk. what a white card is

I use my card all over the country.