Lamar Advertising Company, founded in 1902 by Charles W. Lamar and J.M. Coe, is a publicly owned outdoor advertising company headquartered in Baton Rouge, Louisiana, United States. It operates billboards, logo signs, and transit displays in the United States and Canada. The company has over 200 locations and reportedly more than 325,000 displays across the USA. In 2014, Lamar Advertising Company became a real estate investment trust. As of 2023, the company employs 3,540 people.