611 is an abbreviated dialing telephone number in the North American Numbering Plan, implemented by many telephone companies for reporting troubles with telephone service, or with a payphone. It is an N11 code, which are reserved from assignment as area codes or central office codes, for use in special services.

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Many landline and mobile phone providers support 611. Some providers who supply other services, such as Internet or cable television, support these other services with 611. While 611 has not been officially designated by the FCC, the code receives nearly 74 million calls annually, making it the most frequently used N11 number in the United States.^[1]

611 is not formally assigned by the United States Federal Communications Commission (FCC) or the Canadian Radio-television and Telecommunications Commission (CRTC), but both have chosen not to disturb the assignment as it is generally recognized across the North American Numbering Plan Administration (NANPA).^[2]