Westmoreland is a town in Oneida County, New York, United States. The population was 6,138 at the 2010 census.
According to the United States Census Bureau, the town has a total area of 43.2 square miles (112 km), of which 43.1 square miles (112 km) is land and 0.04 square miles (0.10 km) (0.05%) is water.
As of the census of 2000, there were 6,207 people, 2,234 households, and 1,717 families residing in the town. The population density was 143.9 people per square mile (55.6/km²). There were 2,323 housing units at an average density of 53.9 per square mile (20.8/km²). The racial makeup of the town was 98.15% White, 0.69% African American, 0.24% Native American, 0.29% Asian, 0.21% from other races, and 0.42% from two or more races. Hispanic or Latino of any race were 0.95% of the population.
There were 2,234 households out of which 37.0% had children under the age of 18 living with them, 64.8% were married couples living together, 7.9% had a female householder with no husband present, and 23.1% were non-families. 18.7% of all households were made up of individuals and 8.1% had someone living alone who was 65 years of age or older. The average household size was 2.75 and the average family size was 3.14.
In the town, the population was spread out with 27.6% under the age of 18, 6.2% from 18 to 24, 29.4% from 25 to 44, 24.2% from 45 to 64, and 12.6% who were 65 years of age or older. The median age was 38 years. For every 100 females, there were 104.0 males. For every 100 females age 18 and over, there were 98.1 males.
The median income for a household in the town was $48,768, and the median income for a family was $52,257. Males had a median income of $36,024 versus $24,955 for females. The per capita income for the town was $18,452. About 4.0% of families and 5.1% of the population were below the poverty line, including 5.7% of those under age 18 and 3.5% of those age 65 or over.