Founded in 1902, Lamar Advertising Company is one of the largest outdoor advertising companies in the United States. The firm specializes in selling advertising on billboards, buses, shelters, benches and logo plates. It manages three types of outdoor advertising displays, such as billboards, logo signs and transit advertising displays. The firm serves customers throughout the United States and Canada as well as Puerto Rico. Lamar Advertising Company operates over 150 outdoor advertising companies and 63 transit companies.