Woodlawn is an unincorporated community and census-designated place in Baltimore County, Maryland, United States. The population was 37,879 at the 2010 census. It is home to the headquarters of the Social Security Administration (SSA) and the Centers for Medicare and Medicaid Services (CMS). It is bordered by Catonsville on the south (many parts of Woodlawn are considered Catonsville by residents, especially those parts sharing the Catonsville zip code), by the Patapsco River and Howard County on the west, by Randallstown and Lochearn to the north, and by the City of Baltimore to the east. Parts of Woodlawn are sometimes informally referred to as Security, Maryland, due to the importance of the SSA's headquarters as well as nearby Security Boulevard (Maryland Route 122) and Security Square Mall.