In 1365 King Casimir III the Great granted it town rights, and at that time Kunów was the seat of a parish whose area was 63 square kilometres (24 sq mi).

In the 15th century powerful Cardinal Zbigniew Oleśnicki spent a lot of time in Kunów, which already had a wooden church of St. Władysław.

In 1502 the town was completely burned by the Crimean Tatars, and as a result it temporarily lost its Magdeburg rights, regaining the privileges on August 29, 1535.

In 1578 Kunów had 65 different artisans, and was famous for its white and red marble, used in construction of several palaces (such as the complex of Łazienki Park in Warsaw).

In 1705, 560 residents died in an epidemic, and in the late 18th century, after the Third Partition of Poland, the town was annexed by the Habsburg Empire.