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.
100 Years Strong with Miles Ahead
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.
Kelley Williamson Company: A Legacy in Fuel & Convenience
Founded by Walter Williamson & Nate Kelley
- Established as a local fuel distribution business
Early Growth & Identity
- Early partnerships formed with Mobil
- Kelley Williamson Co. Gasoline
Expansion & Infrastructure
- Developed a proprietary fleet of branded fuel tankers
Retail Evolution
- Transitioned toward modern convenience retail under names like Kwik Way and Mobil Mart
A Multi-Divisional Company
- Branded c-stores to Kelley’s Market
- Oil distribution expansion under KW Oil
Kelley Williamson of Today
- 50 Kelley’s Markets
- Mobil Distributor
- 2 Oil Distribution Warehouses
ExxonMobil Distributor
Kelley’s Markets by Kelley Williamson Company proudly offers superior Mobil gasoline (Regular, Extra and Supreme+) at all our locations, and we take pride in offering fuel that can allow for better cleanliness, enhanced wear protection, and improved performance for your engine and vehicle.
Many stations also sell the highest quality diesel & soy-based biofuels from BQ9000 certified producers. Additionally, our South Main St. store has recently entered the cutting edge CNG (Compressed Natural Gas) market, and an electric car charging station has been installed at our Middleton Kelley’s Market on the west side of Madison, WI.
Donation Requests
Kelley’s Market by Kelley Williamson Company believes strongly in giving back to individuals and organizations that work to better the lives of those in our community. In keeping with this philosophy, we will gladly consider all requests for donations for not-for-profit organizations.
If you would like to request a donation for your organization, please submit your request at least 30 days prior to your event or desired receipt. We ask that all requests be submitted in writing and not over the phone. Form for submitting requests can be found on our Community Involvement page.