Sleepy Hollow is a village in Kane County, Illinois, United States. The population was 3,304 at the 2010 census.
Sleepy Hollow is located in northeastern Kane County at 42°5′27″N 88°18′44″W / 42.09083°N 88.31222°W / 42.09083; -88.31222 (42.090792, -88.312314). It is bordered to the north and east by the village of West Dundee and to the south and west by the city of Elgin.
According to the 2010 census, Sleepy Hollow has a total area of 2.026 square miles (5.25 km), of which 2 square miles (5.18 km) (or 98.72%) is land and 0.026 square miles (0.07 km) (or 1.28%) is water.
Sleepy Hollow is generally bounded by Randall Road to the west and Illinois Route 72 to the north. Illinois Route 31 runs east of the village limits, and Interstate 90 passes to the south.
As of the census of 2000, there were 3,553 people, 1,185 households, and 1,026 families residing in the village. The population density was 1,766.3 people per square mile (682.5/km²). There were 1,207 housing units at an average density of 600.1 per square mile (231.9/km²). The racial makeup of the village was 93.33% White, 0.65% African American, 0.06% Native American, 2.17% Asian, 0.03% Pacific Islander, 1.77% from other races, and 2.00% from two or more races. Hispanic or Latino of any race were 3.77% of the population.
There were 1,185 households out of which 45.7% had children under the age of 18 living with them, 78.8% were married couples living together, 5.7% had a female householder with no husband present, and 13.4% were non-families. 10.0% of all households were made up of individuals and 2.3% had someone living alone who was 65 years of age or older. The average household size was 3.00 and the average family size was 3.22.
In the village, the population was spread out with 30.5% under the age of 18, 5.5% from 18 to 24, 28.6% from 25 to 44, 28.6% from 45 to 64, and 6.8% who were 65 years of age or older. The median age was 38 years. For every 100 females, there were 102.6 males. For every 100 females age 18 and over, there were 99.1 males.
The median income for a household in the village was $91,279, and the median income for a family was $93,629. Males had a median income of $67,379 versus $40,260 for females. The per capita income for the village was $31,005. About 1.5% of families and 1.8% of the population were below the poverty line, including 1.2% of those under age 18 and 4.8% of those age 65 or over.