611 Folsom Street may refer to anything of or relating to the NSA warrantless surveillance controversy and may also refer directly to:

• AT&T's regional switching center, San Francisco.
• Room 641A, located on the sixth floor at AT&T's switching center.
• NSA warrantless surveillance controversy.
• Wiretapping
• Mark Klein, a whistle-blower uncovering U.S. federal spying program.
• San Luis Obispo, data center which routed data to Folsom address.