Founded in 1902, Lamar Advertising Company is an outdoor advertising agency. The agency is one of the leaders in the highway logo sign businesses in the United States. It is one of the America s leading owners and operators of outdoor advertising and logo sign displays. The firm operates over 150 outdoor advertising companies and 63 transit companies. Based in Pearl, Miss., it spans across the United States, Canada and Puerto Rico through billboards, digital billboards, bus shelters, benches and buses.