As of the census of 2010, there were 13,787 people, 5,579 households, and 3,986 families residing in the town. The population density was 4,725.9 people per square mile (1,824.4/km²). There were 5,930 housing units at an average density of 1,944.5 per square mile (750.7/km²). The racial makeup of the town was 97.47% White, 0.74% Black or African American, 0.06% Native American, 0.68% Asian, 0.02% Pacific Islander, 0.28% from other races, and 0.75% from two or more races. Hispanic or Latino of any race were 1.27% of the population.

There were 5,719 households out of which 33.3% had children under the age of 18 living with them, 58.2% were married couples living together, 9.0% had a female householder with no husband present, and 30.3% were non-families. Of all households 25.9% were made up of individuals and 13.6% had someone living alone who was 65 years of age or older. The average household size was 2.48 and the average family size was 3.00.

In the town, the population was spread out with 24.0% under the age of 18, 4.5% from 18 to 24, 27.8% from 25 to 44, 26.0% from 45 to 64, and 17.7% who were 65 years of age or older. The median age was 42 years. For every 100 females, there were 86.5 males. For every 100 females age 18 and over, there were 82.3 males.

The median income for a household in the town was $84,174, and the median income for a family was $92,795. Males had a median income of $56,541 versus $38,690 for females. The per capita income for the town was $45,487. The town is among some of the richest towns in the state (see List of Massachusetts locations by per capita income) and is currently ranked at 16th. About 2.5% of families and 3.7% of the population were below the poverty line, including 4.1% of those under age 18 and 5.4% of those age 65 or over. The median home sale price for the town in 2007 was $565,894. Home values typically range from around $400,000 to upwards of $5 million for ocean front homes. These prices are comparable to other wealthy North Shore towns such as Marblehead and Manchester-by-the-Sea which are located nearby. In upper class oceanfront neighborhoods and neighborhoods with ocean views or views of the Boston skyline, average home prices increase to as much as $1,038,569 and average household incomes can range upwards of $150,000. Larger oceanfront properties have recently been assessed at values greater than $5 million and in some cases upwards of $10 million.