Sinai is a city located in South Dakota. With a 2020 population of 129, it is the 215th largest city in South Dakota and the 17821st largest city in the United States. Sinai is currently growing at a rate of 1.57% annually and its population has increased by 7.50% since the most recent census, which recorded a population of 120 in 2010. Spanning over 0 miles, Sinai has a population density of 351 people per square mile.
The average household income in Sinai is $54,681 with a poverty rate of 12.09%. The median rental costs in recent years comes to $825 per month, and the median house value is $63,600. The median age in Sinai is 34.8 years, 38 years for males, and 29.5 years for females. For every 100 females there are 85.7 males.