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Sinai ( SY-nee-eye) is a town in Brookings County, South Dakota, United States. The population was 120 at the 2010 census.
Sinai is located at 44°14′42″N 97°2′36″W (44.245039, -97.043380).
According to the United States Census Bureau, the town has a total area of 0.37 square miles (0.96 km2), all land.
Sinai has been assigned the ZIP code 57061 and the FIPS place code 58900.
As of the census of 2010, there were 120 people, 52 households, and 32 families residing in the town. The population density was 324.3 inhabitants per square mile (125.2/km2). There were 61 housing units at an average density of 164.9 per square mile (63.7/km2). The racial makeup of the town was 96.7% White, 0.8% Asian, and 2.5% from two or more races. Hispanic or Latino of any race were 1.7% of the population.
There were 52 households, of which 36.5% had children under the age of 18 living with them, 50.0% were married couples living together, 3.8% had a female householder with no husband present, 7.7% had a male householder with no wife present, and 38.5% were non-families. 38.5% of all households were made up of individuals, and 9.6% had someone living alone who was 65 years of age or older.