Bergen is a town in Genesee County, New York, United States. The town is in the northeast corner of the county. The population was 3,120 at the 2010 census. There is also a village of Bergen in the town.
According to the United States Census Bureau, the town has a total area of 27.6 square miles (71.6 km²), of which, 27.6 square miles (71.6 km²) of it is land and 0.04% is water.
Bergen Swamp, a glacial feature now kept as a wildlife preserve, is home to a small endangered rattlesnake, the Eastern Massasauga, as well as a large diversity of other species.
The eastern town line is the border of Monroe County, and the northern town line is the border of both Monroe County and Orleans County.
Interstate 490 passes through the southeast part of the town.
As of the census of 2000, there were 3,182 people, 1,196 households, and 857 families residing in the town. The population density was 115.2 people per square mile (44.5/km²). There were 1,240 housing units at an average density of 44.9 per square mile (17.3/km²). The racial makeup of the town was 97.27% White, 0.31% Black or African American, 0.25% Native American, 0.50% Asian, 0.79% from other races, and 0.88% from two or more races. Hispanic or Latino of any race were 1.01% of the population.
There were 1,196 households out of which 34.2% had children under the age of 18 living with them, 61.8% were married couples living together, 5.6% had a female householder with no husband present, and 28.3% were non-families. 21.8% of all households were made up of individuals and 9.7% had someone living alone who was 65 years of age or older. The average household size was 2.66 and the average family size was 3.14.
In the town, the population was spread out with 26.6% under the age of 18, 7.3% from 18 to 24, 30.7% from 25 to 44, 23.6% from 45 to 64, and 11.8% who were 65 years of age or older. The median age was 37 years. For every 100 females, there were 102.9 males. For every 100 females age 18 and over, there were 101.6 males.
The median income for a household in the town was $49,412, and the median income for a family was $54,012. Males had a median income of $36,913 versus $26,571 for females. The per capita income for the town was $20,932. About 1.6% of families and 4.1% of the population were below the poverty line, including 2.8% of those under age 18 and 7.3% of those age 65 or over.