As of the census of 2000, there were 4,758 people, 1,503 households, and 1,300 families residing in the CDP. The population density was 2,562.2 per square mile. There were 1,512 housing units at an average density of 814.2/sq mi. The racial makeup of the CDP was 88.10% White, 3.89% African American, 0.23% Native American, 2.82% Asian, 3.47% from other races, and 1.49% from two or more races. Hispanic or Latino of any race were 12.65% of the population. There were 1,503 households out of which 38.0% had children under the age of 18 living with them, 73.9% were married couples living together, 9.5% had a female householder with no husband present, and 13.5% were non-families. Of all households 10.5% were made up of individuals and 3.9% had someone living alone who was 65 years of age or older. The average household size was 3.14 and the average family size was 3.38. In the CDP, the population was spread out with 24.6% under the age of 18, 8.3% from 18 to 24, 28.2% from 25 to 44, 30.5% from 45 to 64, and 8.4% who were 65 years of age or older. The median age was 38 years. For every 100 females, there were 98.7 males. For every 100 females age 18 and over, there were 95.2 males. The median income for a household in the CDP was $79,906, and the median income for a family was $86,872. Males had a median income of $51,846 versus $35,162 for females. The per capita income for the CDP was $28,346. About 3.1% of families and 4.5% of the population were below the poverty line, including 4.8% of those under age 18 and 8.4% of those age 65 or over.
History
In 2009, Thiells United Methodist Church, located on Rosman Road, marked its 225th anniversary. The church originated as a mission to American Indians. It was chartered by the City Road Chapel in London in 1784. A small building was built on a piece of land which was set aside by John Thiell, although he did not attend. The building, which had been expanded, was destroyed in a fire in 1973. The congregation, soon after rebuilt, on the same spot on Rosman Road. In 2010, the David B. Roche Volunteer Fire Company celebrated its 50th anniversary. On September 11, 2001, the company experienced tragedy when New York police officer and Thiells volunteer John Coughlin, whose name remains on the roster, died in the World Trade Center.
