Cable ONE Inc. is an operator of cable systems that serves approximately 720,000 customers in 19 states with cable television, telephone and high-speed Internet service. It is a subsidiary of the Washington Post Company, a diversified media and Education Company based in Washington D.C. Based in Phoenix, Ariz., Cable ONE Inc. began in 1986 as a small cable television company. The firm is 10th largest traditional cable company offering consumers a wide range of the latest products, such as high-definition programming, wireless Internet service and phone service with unlimited long distance calling.