Keller Williams Realty, LLC | 480,043 followers on LinkedIn. Austin, Texas-based Keller Williams, the world’s largest real estate franchise by agent count, has more than 1,100 offices and 176,000 agents. The franchise is also No. 1 in units and sales volume in the United States. Since 1983, the company has cultivated an agent-centric, technology-driven, and education-based culture that rewards agents as stakeholders.