Seymour is a town located in western New Haven County, Connecticut, United States. The town was named for Governor Thomas H. Seymour. The population was 15,454 at the 2000 census.

According to the United States Census Bureau, the town has a total area of 15.0 square miles (38.8 km²), of which, 14.6 square miles (37.7 km²) of it is land and 0.4 square miles (1.0 km²) of it (2.67%) is water.

As of the census of 2000, there were 15,454 people, 6,155 households, and 4,210 families residing in the town. The population density was 1,060.6 people per square mile (409.5/km²). There were 6,356 housing units at an average density of 436.2/sq mi (168.4/km²). The racial makeup of the town was 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. Hispanic or Latino of any race were 3.04% of the population.

There were 6,155 households out of which 31.8% had children under the age of 18 living with them, 55.5% were married couples living together, 9.5% had a female householder with no husband present, and 31.6% were non-families. 26.8% of all households were made up of individuals and 10.8% had someone living alone who was 65 years of age or older. The average household size was 2.49 and the average family size was 3.05.

In the town the population was 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 were 65 years of age or older. The median age was 38 years. For every 100 females there were 94.3 males. For every 100 females age 18 and over, there were 92.0 males.

The median income for a household in the town was $52,408, and the median income for a family was $65,012. Males had a median income of $46,171 versus $32,186 for females. The per capita income for the town was $24,056. About 3.6% of families and 3.7% of the population were below the poverty line, including 4.8% of those under age 18 and 3.5% of those age 65 or over.

The Seymour train station provides commuter rail service to Bridgeport, Stamford and Grand Central Terminal in New York City via the Waterbury Branch on the Metro-North Railroad's New Haven Line. CT Transit New Haven Division provides bus service to Seymour on its F West Chapel Street route.

Rimmon Rock, ca. 1915

Rimmon Falls, ca. 1917

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