Maybe, but I'm not surprised to see that they failed around the same time the notion of a large corporation took off. The goal of a large corporation is to reduce liabilities while increasing profits, not the other way round. Company towns probably just weighed these companies down while they tried to turn their attention to a national infrastructure.

Almost completely. I don't know if Disney counts.

Having lived for a semester at Vista Way, I think Disney World's College Program is as close to a living in a company town as you can get nowadays in the US. They completely control two municipalities, and provide the jobs, the bank, the housing, the food, the fire department, the EMS, the phone company, and the transportation services.

The Foxconn facilities in China might be a contender as well, but I don't know enough to say.

You could argue that the ~10 miles surrounding any Wal-Mart Super Center are company town-ish (company suburb?); I bet most of the money paid out comes back in from employees returning to buy staples (figuratively).