Kelley Williamson Co.

The Kelley Williamson Co., founded in 1926, operates 52 Kelley's Market convenience stores in northern Illinois and southern Wisconsin. The company says stores target family-friendly markets and are known for cleanliness, fast and friendly service, well-lit facilities and state-of-the-art equipment. The company offers a mobile program that allows consumers to pay for fuel with their phones. 

For benchmarking purposes, store counts are as of Jan. 1, 2025.