Diana is a town in Lewis County, New York, United States. The population was 1,709 at the 2010 census.
According to the United States Census Bureau, the town has a total area of 140.8 square miles (365 km), of which 137.4 square miles (356 km) is land and 3.5 square miles (9.1 km) (2.48%) is water.
The western part of the town borders the Fort Drum Military Reservation.
The northeast town line is the border of St. Lawrence County, and the eastern town line is the border of Herkimer County. The eastern part of the town is in the Adirondack Park.
New York State Route 3 passes across the town and links with New York State Route 812 south of Remington Center. The highways run conjointly near the northeast town line.
The Indian River flows out the west side of Diana.
As of the census of 2000, there were 1,661 people, 642 households, and 473 families residing in the town. The population density was 12.1 people per square mile (4.7/km²). There were 1,206 housing units at an average density of 8.8 per square mile (3.4/km²). The racial makeup of the town was 97.11% White, 0.06% African American, 1.14% Native American, 0.48% Asian, 0.06% Pacific Islander, 0.06% from other races, and 1.08% from two or more races. Hispanic or Latino of any race were 0.54% of the population.
There were 642 households out of which 32.7% had children under the age of 18 living with them, 63.4% were married couples living together, 6.5% had a female householder with no husband present, and 26.2% were non-families. 21.0% of all households were made up of individuals and 10.0% had someone living alone who was 65 years of age or older. The average household size was 2.59 and the average family size was 3.00.
In the town, the population was spread out with 25.8% under the age of 18, 7.3% from 18 to 24, 26.5% from 25 to 44, 27.8% from 45 to 64, and 12.5% who were 65 years of age or older. The median age was 38 years. For every 100 females, there were 95.6 males. For every 100 females age 18 and over, there were 98.4 males.
The median income for a household in the town was $33,900, and the median income for a family was $39,563. Males had a median income of $35,450 versus $21,813 for females. The per capita income for the town was $15,916. About 8.8% of families and 12.1% of the population were below the poverty line, including 15.5% of those under age 18 and 9.9% of those age 65 or over.