As of the census of 2010, there were 10,025 people, 3,289 households, and 2,811 families residing in the town. The population density was 506.0 people per square mile (195.7/km²). There were 3,629 housing units at an average density of 178.4 per square mile (68.9/km²). The racial makeup of the town was 95.75% White, 0.88% African American, 0.11% Native American, 1.94% Asian, 0.10% Pacific Islander, 0.25% from other races, and 0.98% from two or more races. Hispanic or Latino of any race were 2.05% of the population.
There were 3,289 households out of which 49.8% had children under the age of 18 living with them, 78.4% were married couples living together, 5.0% had a female householder with no husband present, and 15.1% were non-families. 11.2% of all households were made up of individuals and 4.9% had someone living alone who was 65 years of age or older. The average household size was 3.03 and the average family size was 3.28.
In the town the population was spread out with 31% under the age of 18, 4% from 18 to 24, 31% from 25 to 49, 23% from 50 to 64, and 11% who were 65 years of age or older. The median age was 42 years. For every 100 females there were 96.5 males. For every 100 females age 18 and over, there were 92.9 males.
The median income for a household in the town was $209,630. Males had a median income of $220,357 versus $95,455 for females. The per capita income for the town was $92,375. About 1.5% of the population were below the poverty line.
In the 17th century, Weston’s first English settlers were mostly farmers living in the town of Fairfield, Connecticut, the boundaries of which extended to Weston until the late 18th century. The Norfield Parish was created in the area now occupied by the towns of Weston and Easton. In 1787, the area was formally incorporated as the Town of Weston. In 1845, the Town of Easton was split off from Weston.
A meteor exploded above the town December 14, 1807. Six pieces, totaling 28 pounds (13 kg), were recovered and examined by scientists, who issued a report. This was the first time that people realized the nature of meteors.
Despite rocky soil, farmers in town grew apples, onions, and potatoes. Grist, cider, lumber, and fulling mills were built. The town had nine manufacturers by 1850, but two decades later only the Bradley Edge Tool Company still thrived. That factory burned down in 1911.
Unlike other nearby towns, Weston never had a railroad built through it, which stifled the development of non-agricultural businesses. Between the Civil War and the Great Depression, the town’s population dropped from approximately 1,000 to a low of 670, by 1930. Artists, writers, and actors from New York became attracted to the community in the 1930s and began settling in it. Construction of the Merritt Parkway, which arrived to the south of Weston in 1938, resulted in further population growth.