Cable internet providers operate in specific locations, so the ISP near you will depend on your address. That said, there are a few cable internet providers that are available in more areas than others. Xfinity boasts the largest availability, covering 36% of the US population. Spectrum is right behind Xfinity at 33%, followed by Cox (7%), Altice brands Optimum and Suddenlink (5.6% total), RCN (2.6%), WideOpenWest (2.3%) and Mediacom (2%). There are also dozens of regional cable internet providers that operate in hyper-local markets that your address could be serviceable for.