As of the 2010 census, there were 1,565 people, 503 homes, and 415 families in Sparkill. The population density was 2,958 persons per square mile. The racial makeup of the CDP was 83.2% White, 2.0% African American, 0.1% Native American, 9.8% Asian, 2.5% from other races, and 2.4% from two or more races. Hispanic or Latino of any race were 12.2% of the population.
There were 504 households, out of which 46.4% had children under the age of 18 living with them, 67.3% were married couples living together, and 17.7% were non-families. 30% of households had individuals over the age of 65. The average household size was 3.11 persons. The median age was 39.9 years.
The median income for a household in the CDP was $77,440, and the median income for a family was $123,750. About 17.6% of all families, or 16.5% of the population were below the poverty line, including 27.7% of those under the age of 18 and 5.5% of those above the age of 65.
John Moore's Mill - Site on Sparkill Creek below Route 9W Viaduct, Sparkill-In early 19th century John Moore, an African American, operated a saw and grist mill and from 1810–15, a caning mill.
The Christ Episcopal Church of Piermont - 416 Valentine Avenue - This stone church was built in 1865. It is Rockland’s first established Episcopal Church. The first service was held in 1847 in a converted warehouse. Christ Church was designed by the Rev. Charles Babcock, one of the preeminent architects in America at that time, and a founder of the American Institute of Architects provided the plans for the church at no charge. The church with its Gothic Revival architecture and Norman-influenced interior, Christ Episcopal Church is quite similar to the many small "chapel-churches" found in the English or Irish countryside. It retains an original chapel altar installed in 1898, and its stone façade is accented by a stained-glass rose window. The window was obtained by the church in 1938 from the Former Wayside Chapel in Grand View-on-Hudson when the chapel was converted to a private residence.
