Early settler S. S. Rogers built the first house in what would become Liberal in 1872. Rogers became famous in the region for giving free water to thirsty travelers. Reportedly, Liberal gained its name from the common response to his acts of kindness, "That's very liberal of you." In 1885 Rogers built a general store, and with it came an official U.S. Post Office. Rogers named the post office 'Liberal'. After the railroad was built close by, a plan for the town site was created in 1888. A year later the population was around 800.