In response to Frank and Iwekei
There are 219,000,000 televisions in the United States. This is equivalent to 754 televisions per 1000 people
As three-quarters of Americans do not live alone, it is reasonable to assume that many people will share a television with other household members (particularly small children).
According to the United States Census Bureau, in 2001 98% of households had at least one television set. Many homes have more than one television with an average of 2.4 sets per household. As an average household has 2.57 members, this equates to approximately 280,000,000 television viewers (assuming everyone living in a house with a television watches it occasionally).