As of the census of 2010, there were 12,118 residents, 4,080 households, and 3,391 families residing in Mount Sinai. The racial makeup of the CDP was 92.07% White, 1.5% Black or African American, 0.15% American Indian and Alaska Native, 4.0% Asian, 0.07% Native Hawaiian and Other Pacific Islander, and 1.3% from two or more races. Hispanic or Latino of any race were 5.8% of the population. The average household size was 2.96 and the average family size was 3.26. The median age was 41.9.