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According to the United States Census Bureau, the town has a total area of 38.8 km² (15.0 mi²). 37.7 km² (14.6 mi²) of it is land and 1.0 km² (0.4 mi²) of it is water. The total area is 2.67% water.
As of the census of 2000, there are 15,454 people, 6,155 households, and 4,210 families residing in the town. The population density is 409.5/km² (1,060.6/mi²). There are 6,356 housing units at an average density of 168.4/km² (436.2/mi²). The racial makeup of the town is 94.75% White, 1.35% African American, 0.21% Native American, 1.77% Asian, 0.02% Pacific Islander, 1.04% from other races, and 0.87% from two or more races. 3.04% of the population are Hispanic or Latino of any race.
There are 6,155 households out of which 31.8% have children under the age of 18 living with them, 55.5% are married couples living together, 9.5% have a female householder with no husband present, and 31.6% are non-families. 26.8% of all households are made up of individuals and 10.8% have someone living alone who is 65 years of age or older. The average household size is 2.49 and the average family size is 3.05.
In the town the population is spread out with 23.9% under the age of 18, 6.3% from 18 to 24, 32.6% from 25 to 44, 22.9% from 45 to 64, and 14.4% who are 65 years of age or older. The median age is 38 years. For every 100 females there are 94.3 males. For every 100 females age 18 and over, there are 92.0 males.
The median income for a household in the town is $52,408, and the median income for a family is $65,012. Males have a median income of $46,171 versus $32,186 for females. The per capita income for the town is $24,056. 3.7% of the population and 3.6% of families are below the poverty line. Out of the total people living in poverty, 4.8% are under the age of 18 and 3.5% are 65 or older.
In August of 1956, Ed Sullivan was nearly killed in an automobile accident that occurred near his country home in Seymour and had to take a medical leave from the show missing the September 8 appearance of Elvis Presley on his show (something he earlier stated never would happen but he later changed his mind).