McCook is a village in Cook County, Illinois, United States, and is an industrial suburb of Chicago. As of the 2020 census, the village population was 249, which is the lowest population of all municipalities in the county. History McCook was named for John J. McCook, a late 19th-century director of the Santa Fe Railroad and a former Civil War officer. McCook station was served by the railroad in the town. The Outlaws Motorcycle Club was established in McCook in 1935 when Old Route 66 passed through the town. In 1958, six people were killed in an explosion at a Reynolds Metals plant. In 1995, the former Universal Oil Products Riverside Laboratory in McCook was awarded with National Historic Chemical Landmark status. Geography McCook is located at (41.798542, -87.832432). According to the 2021 census gazetteer files, McCook has a total area of , of which (or 99.20%) is land and (or 0.80%) is water. McCook is home to a small population but a large amount of heavy industry, resulting in a large tax base. Demographics As of the 2020 census there were 249 people, 107 households, and 87 families residing in the village. The population density was . There were 113 housing units at an average density of . The racial makeup of the village was 64.26% White, 1.20% Asian, 10.44% from other races, and 24.10% from two or more races. Hispanic or Latino of any race were 36.55% of the population. There were 107 households, out of which 64.49% had children under the age of 18 living with them, 50.47% were married couples living together, 22.43% had a female householder with no husband present, and 18.69% were non-families. 16.82% of all households were made up of individuals, and 11.21% had someone living alone who was 65 years of age or older. The average household size was 3.18 and the average family size was 2.96. The village's age distribution consisted of 24.9% under the age of 18, 13.6% from 18 to 24, 21.7% from 25 to 44, 17% from 45 to 64, and 22.7% who were 65 years of age or older. The median age was 31.4 years. For every 100 females, there were 108.6 males. For every 100 females age 18 and over, there were 101.7 males. The median income for a household in the village was $75,417, and the median income for a family was $65,417. Males had