Lamar Advertising Company | 28,825 followers on LinkedIn. Bringing you news from Lamar Advertising Company, one of the world's largest outdoor advertising media providers. | Founded in 1902, Lamar Advertising Company (Nasdaq: LAMR) is one of the largest outdoor advertising companies in the world, with displays across the United States and Canada. Lamar offers advertisers a variety of billboard, interstate logo, transit and airport advertising formats, helping both local businesses and national brands reach broad audiences every day. In addition to its more traditional out of home inventory, Lamar is proud to offer its customers the largest network of digital billboards in the United States.