Clarence is a town located in the northeastern part of Erie County, New York, United States, northeast of Buffalo. The population was 30,673 according to the 2010 census. This represents an increase of 17.42% from the 2000 census figure. The Clarence census-designated place occupies the southeast part of the town and roughly corresponds to a postal district with ZIP code 14031 and 14221 in the western side which it shares with nearby Williamsville. The town is named in honor of Prince William, Duke of Clarence and St Andrews (1765–1837), the third son of King George III and later king himself, as William IV.
According to the United States Census Bureau, the town has a total area of 53.6 square miles (138.9 km), of which 53.5 square miles (138.6 km) is land and 0.12 square miles (0.3 km), or 0.25%, is water.
The north border of the town is marked by Tonawanda Creek and is the border with Niagara County.
New York State Route 5, called Main Street locally, passes across the south part of the town. NY Route 78, Transit Road, marks the west town line. The eastern terminus of NY Route 324, Sheridan Drive, is located in Clarence at the intersection of NY-5 and Thompson Road. The New York State Thruway (Interstate 90) is immediately south of the town.
This town is partially a suburban community, and the remainder is light industry and agriculture. Town government offices are located in Clarence Center. Clarence, Iowa, is named after the town of Clarence.
As of the census of 2000, there were 26,123 people, 9,154 households, and 7,204 families residing in the town. The population density was 489.2 people per square mile (188.9/km²). There were 9,497 housing units at an average density of 177.8 per square mile (68.7/km²). The racial makeup of the town was 98.65% White, 1.38% Asian, 0.58% African American,0.16% Native American,0.04% Pacific Islander, 0.19% from other races, and 0.56% from two or more races. Hispanic or Latino of any race were 0.80% of the population.
There were 9,154 households out of which 38.6% had children under the age of 18 living with them, 70.3% were married couples living together, 6.1% had a female householder with no husband present, and 21.3% were non-families. 18.4% of all households were made up of individuals and 9.0% had someone living alone who was 65 years of age or older. The average household size was 2.80 and the average family size was 3.22.
In the town, the population was spread out with 28.0% under the age of 18, 5.7% from 18 to 24, 26.4% from 25 to 44, 25.5% from 45 to 64, and 14.5% who were 65 years of age or older. The median age was 40 years. For every 100 females, there were 94.3 males. For every 100 females age 18 and over, there were 91.3 males.
The median income for a household in the town was $88,003, and the median income for a family was $107,998. Males had a median income of $58,538 versus $31,140 for females. The per capita income for the town was $32,717. About 1.0% of families and 1.9% of the population were below the poverty line, including 1.2% of those under age 18 and 3.2% of those age 65 or over.