As of the census in 2000, there were 27,121 people, 10,018 households, and 7,273 families residing in the town of New Milford, Connecticut. The population density was 440.4 people per square mile (170.0/km²). There were 10,710 housing units at an average density of 173.9/sq mi (67.1/km²). It shall be noted that New Milford, CT is the largest town based on land size.
There were 10,018 households out of which 38.0% had children under the age of 18 living with them, 60.0% were married couples living together, 9.0% had a female householder with no husband present, and 27.4% were non-families. 21.3% of all households were made up of individuals and 6.4% had someone living alone who was 65 years of age or older. The average household size was 2.68 and the average family size was 3.15.
In the town the population was spread out with 27.4% under the age of 18, 5.8% from 18 to 24, 33.1% from 25 to 44, 24.2% from 45 to 64, and 9.5% who were 65 years of age or older. The median age was 37 years. For every 100 females there were 97.0 males. For every 100 females age 18 and over, there were 93.8 males.
The median income for a household in the town was $65,354, and the median income for a family was $75,775. Males had a median income of $50,523 versus $34,089 for females. The per capita income for the town was $29,630. About 2.1% of families and 3.3% of the population were below the poverty line, including 2.7% of those under age 18 and 5.5% of those age 65 or over.