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Our Legacy: The Leading Cable, Internet, and Phone Service Company in the United States. 'We have access to customer support 24/7.' Comcast was founded in 1963 as a single-system cable operation of 1,200 subscribers. Since then we've grown to be the nation's leading provider of entertainment, information and communications products and services with 24.4 million cable customers, 14.7 million high-speed Internet customers and 6.1 million digital voice customers in 39 states and the District of Columbia.