Population 586 · Census ACS 2020–24
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Median age by neighborhoodHistory and comparison ↓︎
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Population and households in Sinai
Household size in Sinai
| Period | Sinai | South Dakota | U.S. |
|---|---|---|---|
| 2006–10 | 2.26 | 2.51 | 2.68 |
| 2010–14 | 2.30 | 2.51 | 2.73 |
| 2015–19 | 2.26 | 2.50 | 2.71 |
| 2020–24 | 2.34 | 2.48 | 2.65 |
| Change | +0.08 | −0.03 | −0.03 |
Sinai is a place of small households, averaging 2.34 people against 2.65 for the U.S., which points to many singles, couples and roommates and relatively few children.
Household size: the average number of people living in each occupied home. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25010).
Median age in Sinai
| Period | Sinai | South Dakota | U.S. |
|---|---|---|---|
| 2006–10 | 43.6 | 37.9 | 37.7 |
| 2010–14 | 44.1 | 38.3 | 38.6 |
| 2015–19 | 44.8 | 38.8 | 39.6 |
| 2020–24 | 39.7 | 38.9 | 40.1 |
| Change | −3.9 | +1.0 | +2.3 |
Half of the people in Sinai are younger than 39.7 and half are older, close to the national median of 40.1. Since 2006–10, the median age has dropped from 43.6, but in a place this small, much of that may be survey noise rather than real change.
Median age: the age that splits residents into two equal halves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B01002).
Single-parent households in Sinai
| Period | Sinai | South Dakota | U.S. |
|---|---|---|---|
| 2006–10 | 5.5% | 10.8% | 12.3% |
| 2010–14 | 5.5% | 11.1% | 12.3% |
| 2015–19 | 10.4% | 10.9% | 11.6% |
| 2020–24 | 6.4% | 10.7% | 11.6% |
| Change | +1.0 pts | −0.1 pts | −0.6 pts |
Single-parent households are relatively rare in Sinai: 6.4% of households, against 11.6% nationally.
Single-parent households: households where one adult with no spouse present lives with children under 18. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B11003).
Housing in Sinai
Renters in Sinai
| Period | Sinai | South Dakota | U.S. |
|---|---|---|---|
| 2006–10 | 18.8% | 31.1% | 33.3% |
| 2010–14 | 16.0% | 32.0% | 35.6% |
| 2015–19 | 15.3% | 32.0% | 36.0% |
| 2020–24 | 18.8% | 31.4% | 34.8% |
| Change | +0.0 pts | +0.3 pts | +1.5 pts |
Only 18.8% of households in Sinai rent their homes, far below the national share of 34.8%, so most residents are owners who tend to stay put. Among homeowners, 59.9% have no mortgage at all, well above the national share of 39.8%.
Renters: occupied homes that are rented rather than owned. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25003).
Vacant homes in Sinai
| Period | Sinai | South Dakota | U.S. |
|---|---|---|---|
| 2006–10 | 21.8% | 11.3% | 11.4% |
| 2010–14 | 20.6% | 10.7% | 11.4% |
| 2015–19 | 10.9% | 11.6% | 11.1% |
| 2020–24 | 19.5% | 10.3% | 9.6% |
| Change | −2.3 pts | −1.1 pts | −1.8 pts |
Vacancy is high in Sinai: 19.5% of homes are empty, far above the national rate of 9.6%. In resort and lake areas that usually means seasonal and vacation homes; elsewhere it can point to weak demand.
Vacant homes: homes with no one living in them, including vacation homes and homes for sale or rent. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25002).
Age of homes in Sinai
| Period | Sinai | South Dakota | U.S. |
|---|---|---|---|
| 2006–10 | 1958 | 1972 | 1974 |
| 2010–14 | 1965 | 1974 | 1975 |
| 2015–19 | 1980 | 1977 | 1977 |
| 2020–24 | 1975 | 1981 | 1980 |
| Change | +17 | +9 | +6 |
Housing in Sinai leans a little older: the median home dates to 1975, against 1980 nationally.
Age of homes: the year that splits the housing stock into older and newer halves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25035).
Rent in Sinai
| Period | Sinai | South Dakota | U.S. |
|---|---|---|---|
| 2006–10 | $560 | $631 | $965 |
| 2010–14 | $734 | $692 | $1,040 |
| 2015–19 | $718 | $798 | $1,213 |
| 2020–24 | $826 | $1,000 | $1,571 |
| Change | +$266 | +$369 | +$606 |
Rent in Sinai runs $826 a month at the median, utilities included, well below the U.S. median of $1,571. The typical renter here spends 21.8% of household income on rent, comfortably under the 30% mark often used to define affordable rent, and a smaller share than renters pay nationally.
Rent: monthly rent plus the utilities renters pay themselves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25064).
Education in Sinai
Bachelor's degrees in Sinai
| Period | Sinai | South Dakota | U.S. |
|---|---|---|---|
| 2006–10 | 25.4% | 26.8% | 28.4% |
| 2010–14 | 28.3% | 27.8% | 29.6% |
| 2015–19 | 32.8% | 29.4% | 32.1% |
| 2020–24 | 29.2% | 32.5% | 35.6% |
| Change | +3.8 pts | +5.6 pts | +7.2 pts |
About three in ten adults 25 and older in Sinai (29.2%) have a bachelor's degree or higher, a little below the national share of 35.6%.
Bachelor's degrees: adults 25 and older with a bachelor's degree or higher. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B15003).
High school graduates in Sinai
| Period | Sinai | South Dakota | U.S. |
|---|---|---|---|
| 2006–10 | 88.5% | 89.9% | 84.9% |
| 2010–14 | 94.0% | 91.0% | 86.1% |
| 2015–19 | 93.5% | 91.8% | 87.7% |
| 2020–24 | 96.1% | 93.1% | 89.3% |
| Change | +7.6 pts | +3.2 pts | +4.3 pts |
High school completion is high in Sinai: 96.1% of adults 25 and older have a diploma or equivalent, well above the national rate of 89.3%.
High school graduates: adults 25 and older with a high school diploma, GED or more. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B15003).
Jobs in Sinai
| Period | Sinai | South Dakota | U.S. |
|---|---|---|---|
| 2006–10 | 3.1% | 4.9% | 8.1% |
| 2010–14 | 3.8% | 4.9% | 9.4% |
| 2015–19 | 0.2% | 3.6% | 5.6% |
| 2020–24 | 3.5% | 3.1% | 5.4% |
| Change | +0.4 pts | −1.7 pts | −2.7 pts |
Jobs have been easier to find in Sinai than nationally: unemployment was 3.5%, against 5.4%. That is in line with the rest of South Dakota. Each figure pools five years of surveys (2020–24), so it describes that whole stretch rather than today's job market.
Unemployment: people looking for work as a share of everyone working or looking. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B23025).
Sinai compared with nearby cities
| City | Household size | Median age | Single parents | Renters | Vacant homes | Median year built | Median rent | Bachelor's degree | High school diploma | Unemployment |
|---|---|---|---|---|---|---|---|---|---|---|
| Sinai | 2.34 | 39.7 | 6.4% | 18.8% | 19.5% | 1975 | $826 | 29.2% | 96.1% | 3.5% |
| Arlington | 2.33 | 41.7 | 10.1% | 21.3% | 19.1% | 1972 | $749 | 24.1% | 93.5% | 1.7% |
| Nunda | 2.40 | 37.5 | 1.1% | 7.9% | 9.6% | 1963 | $1,260 | 38.3% | 95.0% | 1.4% |
| Volga | 2.49 | 31.5 | 4.3% | 36.9% | 11.9% | 1978 | $1,063 | 42.3% | 97.8% | 2.0% |
| Ramona | 2.72 | 33.3 | 8.3% | 12.8% | 15.4% | 1972 | $763 | 20.4% | 83.9% | 0.2% |
| Oldham | 2.03 | 53.0 | 4.4% | 22.6% | 35.6% | 1975 | $676 | 22.6% | 95.7% | 2.8% |
| Rutland | 2.42 | 35.5 | 0.7% | 6.5% | 4.6% | 1974 | $1,397 | 39.6% | 95.8% | 0.2% |
| Sunnyview | 3.05 | 26.8 | 7.4% | 29.8% | 6.8% | 2000 | $1,423 | 53.6% | 99.4% | 2.0% |
| Brookings | 2.34 | 30.9 | 4.6% | 49.8% | 9.7% | 1987 | $1,041 | 44.0% | 97.8% | 3.9% |
| Bruce | 2.23 | 49.7 | 5.9% | 15.4% | 22.8% | 1976 | $838 | 24.9% | 98.0% | 2.0% |
| Hetland | 3.11 | 35.9 | 6.6% | 11.6% | 16.9% | 1947 | $638 | 18.3% | 90.7% | 0.8% |
All figures 2020–24.
Cities with similar populations: Okolona, AR · Preston, VA · Preble, NY · Prairieville, MN · Perry Center, NY · Pembina, ND · Partee, AR · Paradise, WA · Palmers, MN · Overbrook, AL
About these numbers
Every figure on this page is a BestNeighborhood calculation from the Census Bureau's American Community Survey (ACS), built up from the Census block groups that make up Sinai. Each ACS 5-year release pools five years of responses; this page shows the last 15 releases, 2006–10 through 2020–24. Neighboring releases share four of their five years, so they move gradually and small changes between them are within the survey's margin of error; in small places the lines can jump from one release to the next for the same reason. The maps show the same measures for each neighborhood, ranked against the whole country.
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