Atlantic Broadband, a wholly owned subsidiary of Cogeco Cable Inc. is the 9th largest cable operator in the United States, based on the number of television service customers served. The company currently provides TV, Internet and Phone services to approximately 246,000 television service customers located in five operating regions: western Pennsylvania, Miami Beach, Maryland/Delaware, Aiken, S.C. and eastern Connecticut. Atlantic Broadband is headquartered in Quincy, Massachusetts. It was formed by acquiring nonstrategic regions from Charter Communications in 2004.
In 2017, Atlantic Broadband acquired MetroCast.