Comcast Xfinity is the largest cable internet provider in the country, with relatively strong customer service scores and gigabit service available across the entire coverage map. Addresses ...

Whether you’ve heard of CenturyLink or Xfinity likely ... cover 46 states with internet service along with Washington, D.C. The companies only have overlapping coverage in 10 states.

Most of that coverage is cable internet, but Xfinity has a small fiber network. AT&T pegs the number of households with access to fiber at approximately 21 million, spanning over 100 metro areas.