As of October 1, 2016, all U.S. citizens applying for a passport will be required to include their Social Security number on their application form. U.S. citizens who were never issued a Social Security number can apply for one along with the passport application or sign a sworn statement declaring that they have never applied for a number. To submit a first-time Social Security application, you will need to have one form of valid U.S. government-issued identification. You can find the SS-5 application and instructions at this link. If you have a number but do not remember it, contact the Social Security Administration (FBU.Manila@ssa.gov) BEFORE submitting your passport application. This new policy applies to routine passport services and will not prevent emergency travel to the United States.
NOTE: Applicants without an SSN will no longer be able to mail or courier their DS-82 (adult renewals) and DS-5504 (e.g. limited passport replacement) forms to the Embassy. Please make an appointment to be interviewed in person.