Clear Channel Outdoor announced it is adding to its growing list of digital billboard networks with new displays in some of the largest markets, including Chicago and Philadelphia. Building upon a successful network launch in Los Angeles this May, the company also is launching a second phase in that market this month. In addition, the company’s El Paso Digital Outdoor Network, which debuted in July, added one of the largest Hispanic DMAs to CC’s Digital Outdoor Networks. The company has now deployed 76 digital billboards since the first of the year. By the end of this month, Clear Channel Outdoor will be operating 16 digital billboard networks in the following 14 DMAs: Akron, Albuquerque, Chicago, Cleveland, Columbus, El Paso, Memphis, Milwaukee, Minneapolis/St. Paul, Orlando, Tampa Bay, Wichita, and two networks in both Los Angeles and Las Vegas.