In Lake County Indiana, it's strictly Comcast, though it's 3 separate Comcast services. Hammond, East Chicago, & Whiting are served by one branch of Comcast (this area originally started out as United Cable, then TCI, then AT&T, to the current Comcast). Gary having their own Comcast started out as TCI, then AT&T, to the current Comcast. The rest of the county is served by the county system Comcast, & it started out as US Cable in the 70's in Griffith, then expanded throughout the county that didn't already have cable. It was bought by TCI, after they couldn't afford to make upgrades to the network. After TCI, it became AT&T, & they brought digital cable to the area, & finally, becoming Comcast.
AT&T has limited UVerse service in Lake County Indiana. Verizon was expanding FiOS in Hobart, Lake Station, New Chicago, & parts of Merrillville, but they stopped expanding it when Verizon sold off the former GTE service in Indiana, & was sold to Frontier. TV service never became available under Verizon, but not sure if Frontier has expanded what Verizon left off, or if TV service is even available under Frontier.
So other than cable in areas not having TV service from AT&T & Frontier, then it's monopoly with Comcast (not counting DirecTV & Dish Network since it's satellite, & available anywhere in the main 48 states)