YouTube TV has tripled its base by expanding to ten more cities. And in nine of those cities, the emerging streaming service will provide the live local feeds from the four major broadcast networks, ABC, CBS, Fox and NBC. Rather than do one massive rollout, YouTube TV has been doing it slowly ensuring that it has agreements with local network affiliates before launching in a market.

YouTube TV was originally in a handful of markets including Chicago, Los Angeles, New York, Philadelphia and San Francisco-Oakland. The newest cities include Atlanta, Charlotte, Dallas, Detroit, Houston, Miami, Minneapolis, Orlando, Phoenix and Washington, D.C.

The only market in this new expansion that won’t have access to all local channels will be Dallas as it will be missing ABC, but it still has the other three networks.

YouTube TV continues to expand its pay TV channels as it has added several entertainment and news channels to its lineup. It also brought Olympic Channel on-board when it launched last week. YouTube TV has the sports networks from ESPN, Fox and NBC.

It’s hoping to continue to keep the younger viewers that have been abandoning traditional TV (half of traditional TV viewers are over 49) as Nielsen notes that more than half of YouTube viewers range between 13 to 34 years of age.

So YouTube TV is slowly rolling out its service, but there are perfectly good reasons to do so. It may not be in your city yet, but it’s hoping to be there soon.

[TechCrunch]