Business What will $78M buy? For Lamar, another 3,500 billboards By Holly Duchmann - February 28, 2023 Lamar Advertising, which has called Baton Rouge home for more than 100 years, is the nation’s largest outside advertising company. (Tim Mueller) FacebookTwitterLinkedinEmailPrint Baton Rouge-based Lamar Advertising Company has completed a $78 million deal to acquire some 3,500 billboards in the South. Already an INSIDER? Sign in.