Sinai

County:: Brookings County
County Seat:: No
Area (mi²):: 0.368
State:: South Dakota

Sinai is a town located in Brookings County, South Dakota. Sinai has a 2025 population of 104. Sinai is currently growing at a rate of 1.96% annually and its population has increased by 8.33% since the most recent census, which recorded a population of 96 in 2020.

The average household income in Sinai is $68,621 with a poverty rate of 1.36%.The median age in Sinai is 24.9 years: 24.8 years for males, and 27.3 years for females.

Demographics

The racial composition of Sinai includes 91.82% White, and smaller percentages for other race and multiracial populations.

Population by Race

Race	Population	Percentage (of total)
White	202	91.82%
Two or more races	14	6.36%
Other race	4	1.82%

Sinai Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Sinai's average per capita income is $47,083. Household income levels show a median of $52,188. The poverty rate stands at 1.36%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.

Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.

Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.

Name	Median	Mean
Married Families	$78,750	-
Families	$77,813	$77,123
Households	$52,188	$68,621
Non Families	$40,982	$52,352

$47,083

Average Income

$52,188

Median Household Income

1.36%

Poverty Rate