Sinai, SD Profile: Facts, Map & Data


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Sinai, South Dakota - Basic Facts

The Town of Sinai had a population of 127 as of July 1, 2017.

The primary coordinate point for Sinai is located at latitude 44.2445 and longitude -97.044 in Brookings County. The formal boundaries for the Town of Sinai (see map below) encompass a land area of 0.37 sq. miles and a water area of 0 sq. miles. Brookings County is in the Central time zone (GMT -6). The elevation is 1,785 feet.

The Town of Sinai (GNIS ID: 1267565) has a C5 Census Class Code which indicates an active incorporated place that is independent of any county subdivision and serves as a county subdivision equivalent. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.

Beneath the boundary map are tables with Sinai population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2017.

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Town of Sinai, SD Boundary Map

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Sinai, SD Data & Demographics (As of July 1, 2017)


Total Population 127
Daytime Population: Workers 127
Daytime Population: Residents 55
Total Daytime Population (TDP) 182
Ratio TDP/Total Population1 1.43
Population in Households 127
Population in Familes 110
Population in Group Qrtrs 0
Population Density2 345
Diversity Index3 9


Median Household Income $77,504
Average Household Income $96,876
Per Capita Income $39,473


Total Housing Units 65 (100%)
Owner Occupied HU 51 (78.5%)
Renter Occupied HU 5 ( 7.7%)
Vacant Housing Units 9 (13.8%)
Median Home Value $188,750
Average Home Value $239,706


Total Households 56
Average Household Size 2.27
Family Households 42
Average Family Size 3
  1. If the ratio of the TDP to Total Population is greater than 1, the location gains population during the day when commuting workers are present. If the ratio is less than 1, the location is more of a bedroom community where people commute to another place for work.
  2. Population Density = Total Population per square mile.
  3. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.


2010-2017 2017-2022
Population 0.79% 1.08%
Households 1.03% 1.05%
Families 3.82% 1.39%
Median Household Income   0.87%
Per Capita Income   3.01%

Sinai, SD - Peer Comparisons by Rank and Percentile

The table below compares Sinai to the other 391 incorporated cities, towns and CDPs in South Dakota by rank and percentile using July 1, 2017 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 264 33rd
Population Density # 228 42nd
Diversity Index # 283 28th
Median Household Income # 13 97th
Per Capita Income # 8 98th

Additional comparisons and rankings can be made with a VERY EASY TO USE South Dakota Census Data Comparison Tool.

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