100 Years Strong with Miles Ahead
Since 1926, Kelley Williamson Company has set the standard for quality products and service, growing from its beginnings as Rockford Oil Company into a convenience store leader, trusted Mobil fuels and lubricants distributor, and active community partner. Early expansion across the region helped establish the Kelley Williamson name as synonymous with dependable fueling throughout Northern Illinois and Southern Wisconsin.
In the 1980s and 1990s, the company evolved once more, transitioning from traditional service stations and fuel distribution into operating convenience store locations known for clean, quick shopping experiences, like the Kelley’s Markets you see today. Throughout this growth, our fuel distribution and lubricant sales continued to be industry leaders.
Today, that growth has not halted. With the newest Kelley’s Market station opening in December 2025, Kelley Williamson Company is reaching new heights and serving more communities than ever before while remaining family owned and locally operated. We extend our gratitude to our loyal customers, our dedicated employees who keep us running in all conditions, and the communities that welcome and support our efforts.
100 years strong with miles ahead. Thank you for traveling with us.
Our Focus
Dedicated to the precise management of oils and lubricants, Kelley Williamson Mobil focuses on serving a wide range of businesses across Illinois and Wisconsin. From industrial clients to local fleets, we ensure quality and performance in everything we deliver.
We provide all products promptly and conveniently because customer satisfaction is our top priority. Welcome to Kelley Williamson Mobil Rockford IL, where reliability meets innovation. We hope you find our website helpful and informative. Our constant goal is to exceed customer expectations—today, tomorrow, and always.
Comprehensive Services
Beyond offering premium oils and lubricants, Kelley Williamson Mobil and KW Oil deliver a full range of support services. These include expert consultation, Mobil Serv™ oil analysis, storage solutions, and computerized tank monitoring systems. Altogether, these tools help customers maintain efficiency and extend equipment life.
Because technology changes quickly, our team focuses on continuous learning and improvement. Moreover, we work together to provide the best customer experience in the industry. In addition, we emphasize innovation, reliable service, and superior product quality—traits that define our position as a trusted Mobil Rockford partner.
Kelley’s Market Connection
Kelley’s Market, a well-known name in Midwest convenience retail, is part of the Kelley Williamson Company family. Founded in 1926 by Walter Williamson and Nate Kelley, the company established a tradition of service and trust that continues today.
As the proud parent organization of Kelley Williamson Mobil Rockford IL, the company manages almost 50 Kelley’s Market convenience stores and fuel centers across Northern Illinois and Southern Wisconsin. Each site reflects our core values—quality, consistency, and community commitment. Consequently, Kelley Williamson Mobil remains a trusted local brand with deep regional roots.
Core Principles
Founded on dedication to quality, service, and knowledge, Kelley Williamson Mobil began as a modest fuel and lubricant distributor. Over time, it evolved into the leading supplier of commercial, agricultural, and industrial fuels across Northern Illinois and Southern Wisconsin.
Every member of our Mobil Rockford and KW Oil teams works with integrity and professionalism. As a result, we ensure every customer receives attentive service and the right solutions for their needs. Our enduring commitment to excellence continues to guide our growth and ensure long-term success.