The sixth town to be granted from the Masonian land purchase of 1746, Newton was originally part of South Hampton. A number of the residents felt they were too far away from its church for their convenience, and the town was incorporated by Colonial Governor Benning Wentworth as Newtown in 1749, simply because it was a new town. In 1846, the New Hampshire legislature voted to contract the name to Newton.
There were 1,518 households out of which 40.7% had children under the age of 18 living with them, 66.1% were married couples living together, 7.2% had a female householder with no husband present, and 22.9% were non-families. 15.8% of all households were made up of individuals and 5.6% had someone living alone who was 65 years of age or older. The average household size was 2.83 and the average family size was 3.19.
In the town the population was spread out with 28.8% under the age of 18, 5.8% from 18 to 24, 36.2% from 25 to 44, 21.6% from 45 to 64, and 7.6% who were 65 years of age or older. The median age was 35 years. For every 100 females there were 99.1 males. For every 100 females age 18 and over, there were 98.1 males.
The median income for a household in the town was $60,972, and the median income for a family was $62,271. Males had a median income of $43,510 versus $32,471 for females. The per capita income for the town was $22,910. About 2.7% of families and 4.0% of the population were below the poverty line, including 3.4% of those under age 18 and 16.0% of those age 65 or over.