Citibank

Citibank is the consumer banking division of Citigroup, a major global financial institution. It provides a wide range of financial products including credit cards, personal and business banking, loans, and wealth management services. Many U.S. credit card accounts issued by Citibank are legally tied to entities based in South Dakota, which is why some transaction descriptors reference “SD” and ZIP codes like 57104 (Sioux Falls, SD).

A charge labeled like “CITIBANK SD, 57104” typically appears in connection with a Citibank-issued credit card or banking transaction. This may represent a payment you made to a Citibank credit card, a cash advance, a balance transfer, an interest or fee charge, or an adjustment or refund related to your account. Sometimes card issuers post internal transfers, promotional balance transfers, or account fees under a generic Citibank location rather than a merchant-specific name.

To verify the charge, log into your Citibank online or mobile banking account and review your recent activity and statements; the transaction detail there usually provides more context (such as “payment received,” “cash advance,” or “balance transfer”). If you still do not recognize the transaction, contact Citibank customer service using the phone number on the back of your card or via secure messaging in your online account, rather than any number you might find by searching the descriptor. They can explain the transaction, investigate possible fraud, and reverse or dispute charges where appropriate.