Tellabs, Inc. is headquartered in the United States. The company's primary location is Naperville, Illinois, a suburb of Chicago. This strategic location enables Tellabs to have proximity to a robust business environment, access to talent, and connectivity to major transportation networks. Additionally, Tellabs has additional offices and facilities across the United States, including offices in Richardson, Texas and in Ontario, California. Through its nationwide presence, Tellabs ensures efficient customer support, sales operations, and collaboration with partners. While Tellabs operates primarily within the United States, its products and services have a global reach, serving customers in various industries worldwide.