| | Alcester, SD | Centerville, SD | United States |
| Population | 950 | 888 | 329,725,481 |
| Female Population | 51.2% | 46.6% | 50.5% |
| Male Population | 48.8% | 53.4% | 49.5% |
| Median Age | 50.4 | 42.2 | 38.4 |
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| Population - 2010 | 814 | 887 | 309,327,143 |
| Population - 2000 | 880 | 910 | 285,036,114 |
| Population - 1990 | 843 | 887 | 251,960,433 |
| Pop. 2000 to Now | -14.1% | -4.4% | 15.6% |
| Pop. 1990 to Now | -10.3% | -1.9% | 30.8% |
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| Population Density | 2,844.3 | 1,233.3 | 93.4 |
| Land Area | 0.3 | 0.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Alcester, SD | Centerville, SD | United States |
| Age 0 to 4 | 11.8% | 5.5% | 5.9% |
| Age 5 to 9 | 2.7% | 6.1% | 6.1% |
| Age 10 to 14 | 10.3% | 9.6% | 6.6% |
| Age 15 to 17 | 0.6% | 2.0% | 3.9% |
| Age 18 to 20 | 1.5% | 2.8% | 4.0% |
| Age 21 to 24 | 0.7% | 3.2% | 5.2% |
| Age 25 to 34 | 9.1% | 11.7% | 13.8% |
| Age 35 to 44 | 9.6% | 12.8% | 12.9% |
| Age 45 to 54 | 6.9% | 8.3% | 12.6% |
| Age 55 to 59 | 4.3% | 4.5% | 6.7% |
| Age 60 to 64 | 5.9% | 6.1% | 6.3% |
| Age 65 to 74 | 19.5% | 17.9% | 9.6% |
| Age 75 to 84 | 10.1% | 6.8% | 4.5% |
| Age 85 and over | 6.9% | 2.7% | 1.9% |
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| Race | | | |
| | Alcester, SD | Centerville, SD | United States |
| White | 85.4% | 99.3% | 59.4% |
| Black | 0.4% | 0.0% | 12.2% |
| Asian | 0.7% | 0.0% | 5.6% |
| Native American | 0.3% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 12.3% | 0.3% | 3.2% |
| Hispanic | 0.8% | 0.0% | 18.4% |
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| Marriage & Family | | | |
| | Alcester, SD | Centerville, SD | United States |
| Married Population | 55.6% | 60.4% | 49.8% |
| Currently Married | 55.6% | 56.6% | 48.0% |
| Married but Separated | 0.0% | 3.9% | 1.8% |
| Single Population | 44.4% | 39.6% | 50.2% |
| Never Married | 17.4% | 19.0% | 33.8% |
| Divorced | 15.5% | 10.3% | 10.8% |
| Widowed | 11.5% | 10.3% | 5.6% |
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| Household Size | 2.35 | 2.16 | 2.60 |
| Households | 386 | 398 | 124,010,992 |
| Family Households | 256 | 236 | 80,755,759 |
| Married couple, w/children | 14.5% | 28.8% | 30.5% |
| Married couple, no children | 57.4% | 48.7% | 42.9% |
| Non Family Households | 130 | 162 | 43,255,233 |
| Single householder, w/children | 16.8% | 19.1% | 15.8% |
| Single householder, no children | 11.3% | 3.4% | 10.8% |