...and anything with the number on it.
Your nine-digit Social Security number is all a savvy ID thief needs to open new credit card accounts or loans in your name. ID-theft experts say your Social Security card is the absolute worst item to carry around.
Once you've removed your card, look for anything else that may contain your SSN. As of December 2005, states can no longer display your SSN on newly issued driver's licenses, state ID cards and motor-vehicle registrations. If you still have an older photo ID, request a new card prior to the expiration date. There might be an additional fee, but it's worth it to protect your identity.
Retirees, pull out your Medicare card, too, because it has your SSN on it.
Instead: Photocopy your Medicare card (front and back) and carry it with you instead of your real card. Experts are torn when it comes to blacking out a portion of your Social Security number on the copy, so to be safe, black out all nine digits. If an appointment requires the full SSN, you can then provide it as needed.