How many US out of home advertising companies are there? (Billboard Insider)
Marci Werlinich at OAAA says there are 825 independent billboard companies in the OAAA database. OAAA continually updates its database. Insider thinks this number is probably the most accurate. […]
billboardinsider.com
Sat, Nov 5, 2016 at 5:51 PM
Sat, Nov 5, 2016 at 5:51 PM