211 - Dial 2-1-1 for non-emergency social assistance - 24/7/365. Dialing 2-1-1 reaches a trained professional who can connect one to essential community services, such as utility assistance, food, shelter, counseling, childcare, job training, senior services, disaster relief and much more. Whenever non-emergency social assistance is needed, 2-1-1 is the first number to call. http://www.211.org/
411 - The telephone number for local directory assistance in the United States and Canada.
511 - The telephone number for National traffic and road closure information. http://www.fhwa.dot.gov/trafficinfo/511.htm
611 - The telelphone number reserved in the U.S. and Canada for an immediate connection with a wireless service provider.
711 - Telephone number is used for the Telecommunications Relay Service to translate from TDD for the deaf to speech, and vice versa. The relay service allows deaf people to converse with the hearing over the phone through an operator.
811 - is a three-digit telephone number that has been mandated by the Federal Communications Commission (FCC). It is the national "call before you dig" number that is used to request an underground locate before any excavation activity. http://call811.com/
911 - The emergency telephone number (sometimes known as the universal emergency telephone number or the emergency services number) that allows a caller to contact local emergency services for assistance.