If you are ready to begin, filing for social security benefits and live in or around a major U.S. city, visit your Social Security Administration (SSA) office to file your claim in person. Check your telephone directory under the U.S. Government listings and the subheadings of either Social Security Administration or Department of Health and Human Services. Alternatively, you may call the Social Security Administration at 800-772-2123 or visit their website at www.ssa.gov to begin filing for social security benefits. To receive retirement benefits, you must support your claim with several documents, including your social security number, birth certificate, military discharge papers if applicable and your most recent tax return or W-2. To file for disability benefits, known as SSD, the SSA requires considerable medical evidence to prove your eligibility. This type of claim may require assistance from a professional, experienced disability attorney.