Sarah Bilkins, WalletHub Credit Card Analyst
@sarah.bilkins
A Costco Household Card is a membership card that allows anyone over the age of 18 who lives with you to share your Costco membership. This is great for families because it allows different people to take turns doing the shopping, and doesn’t force you to buy a separate membership for each family member. One Household Card is included in every Costco membership.
There is just one restriction. Anyone who uses a Household Card must actually prove that they live at the same address as the person who bought the membership. So you’ll have to bring ID with the correct address on it, in case the person at the register decides to check. If you do not provide this identification, Costco may refuse to sell you anything. This prevents people from just selling their Household Cards or splitting a Costco membership with friends.
It’s also important to note that the Household Card is just a way to get member benefits. It’s not how you’ll actually pay for your purchases. So make sure you have your credit card as well as your Costco membership card or Household Card when you go to the store. Otherwise, you’ll be charged more money for what you buy. Anyone can shop at Costco, by the way, but only members get the real savings.

Costco Anywhere Visa® Card by Citi
Adrian Binnion, Member
@Evel_Knievel
I think Sarah is actually wrong in her definition. It's simply a second card for a second person living with you. If you have a third person say a college student living with you, they cannot share the household card. You simply get a second membership card.
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