Darien is a town in Genesee County, New York, United States. The population was 3,158 at the 2010 census. Darien lies in the southwest part of Genesee County, southwest of Batavia.
According to the United States Census Bureau, the town has a total area of 47.6 square miles (123 km), of which 47.5 square miles (123 km) is land and 0.1 square miles (0.26 km), or 0.13%, is water.
The west town line is the town of Alden in Erie County, and the south town line is the town of Bennington in Wyoming County.
US Route 20 (Broadway) passes across the town and intersects NY-77 at Darien Center. The northern terminus of NY-238 (Attica Road) is in Darien. NY-33 crosses the northwest corner of Darien.
As of the census of 2000, there were 3,061 people, 1,064 households, and 854 families residing in the town. The population density was 64.4 people per square mile (24.9/km²). There were 1,125 housing units at an average density of 23.7 per square mile (9.1/km²). The racial makeup of the town was 99.12% White, 0.10% African American, 0.29% Native American, 0.03% Asian, and 0.46% from two or more races. Hispanic or Latino of any race were 0.23% of the population.
There were 1,064 households out of which 37.9% had children under the age of 18 living with them, 69.5% were married couples living together, 5.9% had a female householder with no husband present, and 19.7% were non-families. 15.8% of all households were made up of individuals and 6.1% had someone living alone who was 65 years of age or older. The average household size was 2.87 and the average family size was 3.20.
In the town, the age distribution of the population shows 29.0% under the age of 18, 6.3% from 18 to 24, 30.5% from 25 to 44, 23.3% from 45 to 64, and 10.8% who were 65 years of age or older. The median age was 37 years. For every 100 females, there were 109.1 males. For every 100 females age 18 and over, there were 102.6 males.
The median income for a household in the town was $48,844, and the median income for a family was $50,844. Males had a median income of $35,000 versus $23,278 for females. The per capita income for the town was $18,372. About 1.8% of families and 3.2% of the population were below the poverty line, including 2.4% of those under age 18 and 3.4% of those age 100 and older