According to Capital One, it is possible to find out where to send a Capital One credit card payment by entering the first six digits of the credit card number at its Credit Card Payment Wizard page. Capital One also encourages card users to make payments online for faster processing.
Capital One provides a variety of addresses to which a person can send queries. Card holders wishing to investigate a payment that has been misapplied should write to Capital One, Attn: Payment Investigations, PO Box 30287, Salt Lake City, Utah 84130-0287. To dispute a charge, a user should write to the Disputes Department at PO Box 30279 Salt Lake City, Utah 84130-0279. Suspected fraud can be reported to Capital One at PO Box 30277, Salt Lake City, Utah 84130-0277.