Saybrook is a village in southeast McLean County, Illinois, United States. The population was 693 at the 2010 census. It is part of the Bloomington–Normal Metropolitan Statistical Area.
Saybrook is located at 40°25′39″N 88°31′36″W / 40.42750°N 88.52667°W / 40.42750; -88.52667 (40.427490, -88.526536).
According to the 2010 census, Saybrook has a total area of 0.809 square miles (2.10 km), of which 0.78 square miles (2.02 km) (or 96.42%) is land and 0.029 square miles (0.08 km) (or 3.58%) is water.
As of the census of 2000, there were 764 people, 325 households, and 219 families residing in the village. The population density was 964.3 people per square mile (373.4/km²). There were 340 housing units at an average density of 429.2 per square mile (166.2/km²). The racial makeup of the village was 98.82% White, 0.13% African American, 0.13% Asian, and 0.92% from two or more races. Hispanic or Latino of any race were 0.26% of the population.
There were 325 households out of which 31.7% had children under the age of 18 living with them, 54.8% were married couples living together, 9.5% had a female householder with no husband present, and 32.6% were non-families. 28.9% of all households were made up of individuals and 13.5% had someone living alone who was 65 years of age or older. The average household size was 2.35 and the average family size was 2.88.
In the village, the population was spread out with 25.3% under the age of 18, 7.5% from 18 to 24, 28.3% from 25 to 44, 23.3% from 45 to 64, and 15.7% who were 65 years of age or older. The median age was 39 years. For every 100 females, there were 90.5 males. For every 100 females age 18 and over, there were 87.8 males.
The median income for a household in the village was $37,778, and the median income for a family was $43,750. Males had a median income of $29,688 versus $21,806 for females. The per capita income for the village was $16,671. About 7.7% of families and 8.6% of the population were below the poverty line, including 12.6% of those under age 18 and 8.0% of those age 65 or over.