Markham is a suburban city in Cook County, Illinois, United States. The population was 12,508 at the 2010 census.
Markham, southwest of the southern tip of Lake Michigan, had been a crossroad for early pioneers. In 1816 a treaty was made with the Ottawa, Chippewa and Potawatomi tribes which ceded a corridor of land located between a point north of the Chicago River and the mouth of the Calumet River to the settlers.The village of Markham was incorporated in 1925 with a population under 300. The village was named for Charles H. Markham, president of the Illinois Central Railroad 1911-1918, 1919-1926.