Leyden Township is one of 29 townships in Cook County, Illinois, USA. As of the 2020 census, its population was 93,096 and it contained 35,824 housing units.^[1]

Leyden Township is located generally west of the northern part of the city of Chicago, an strip of which (a stretch of land connecting O'Hare International Airport to the main body of the city) bisects the township. According to the 2021 census gazetteer files, Leyden Township has a total area of 19.92 square miles (51.59 km²), all land.^[2]

As of the 2020 census^[1] there were 93,096 people, 32,387 households, and 22,127 families residing in the township. The population density was 4,672.56 inhabitants per square mile (1,804.09/km²). There were 35,824 housing units at an average density of 1,798.03 per square mile (694.22/km²). The racial makeup of the township was 56.15% White, 2.52% African American, 1.54% Native American, 3.76% Asian, 0.03% Pacific Islander, 21.05% from other races, and 14.95% from two or more races. Hispanic or Latino of any race were 42.97% of the population.

There were 32,387 households, out of which 31.90% had children under the age of 18 living with them, 46.91% were married couples living together, 14.55% had a female householder with no spouse present, and 31.68% were non-families. 27.60% of all households were made up of individuals, and 11.00% had someone living alone who was 65 years of age or older. The average household size was 2.79 and the average family size was 3.44.

The township's age distribution consisted of 22.4% under the age of 18, 8.7% from 18 to 24, 27.8% from 25 to 44, 26.6% from 45 to 64, and 14.5% who were 65 years of age or older. The median age was 38.7 years. For every 100 females, there were 97.0 males. For every 100 females age 18 and over, there were 93.6 males.

The median income for a household in the township was $63,681, and the median income for a family was $78,411. Males had a median income of $42,950 versus $32,896 for females. The per capita income for the township was $28,718. About 8.8% of families and 10.5% of the population were below the poverty line, including 16.2% of those under age 18 and 7.9% of those age 65 or over.

• Illinois's 4th congressional district
• State House District 65
• State House District 77
• State Senate District 33
• State Senate District 39