| | Tyndall, SD | Rochester, WA | United States |
| Population | 1,210 | 6,065 | 329,725,481 |
| Female Population | 48.8% | 50.4% | 50.5% |
| Male Population | 51.2% | 49.6% | 49.5% |
| Median Age | 46.9 | 40.4 | 38.4 |
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| Population - 2010 | 1,066 | 2,007 | 309,327,143 |
| Population - 2000 | 1,239 | 1,829 | 285,036,114 |
| Population - 1990 | 1,201 | 1,250 | 251,960,433 |
| Pop. 2000 to Now | -18.1% | 75.2% | 15.6% |
| Pop. 1990 to Now | -15.5% | 156.4% | 30.8% |
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| Population Density | 766.8 | 2,603.0 | 93.4 |
| Land Area | 1.6 | 2.3 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Tyndall, SD | Rochester, WA | United States |
| Age 0 to 4 | 5.0% | 10.6% | 5.9% |
| Age 5 to 9 | 6.4% | 4.3% | 6.1% |
| Age 10 to 14 | 8.1% | 5.6% | 6.6% |
| Age 15 to 17 | 3.9% | 3.2% | 3.9% |
| Age 18 to 20 | 3.7% | 5.6% | 4.0% |
| Age 21 to 24 | 2.4% | 2.2% | 5.2% |
| Age 25 to 34 | 6.6% | 11.9% | 13.8% |
| Age 35 to 44 | 10.2% | 10.7% | 12.9% |
| Age 45 to 54 | 11.8% | 18.6% | 12.6% |
| Age 55 to 59 | 5.9% | 6.0% | 6.7% |
| Age 60 to 64 | 5.4% | 5.3% | 6.3% |
| Age 65 to 74 | 14.0% | 6.0% | 9.6% |
| Age 75 to 84 | 8.4% | 9.7% | 4.5% |
| Age 85 and over | 8.2% | 0.3% | 1.9% |
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| Race | | | |
| | Tyndall, SD | Rochester, WA | United States |
| White | 92.0% | 76.3% | 59.4% |
| Black | 2.9% | 0.0% | 12.2% |
| Asian | 0.0% | 0.7% | 5.6% |
| Native American | 1.7% | 2.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 1.6% | 0.4% |
| Two or More Races | 1.1% | 1.6% | 3.2% |
| Hispanic | 2.4% | 17.5% | 18.4% |
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| Marriage & Family | | | |
| | Tyndall, SD | Rochester, WA | United States |
| Married Population | 57.1% | 55.9% | 49.8% |
| Currently Married | 56.4% | 54.1% | 48.0% |
| Married but Separated | 0.7% | 1.7% | 1.8% |
| Single Population | 42.9% | 44.1% | 50.2% |
| Never Married | 17.2% | 26.7% | 33.8% |
| Divorced | 14.8% | 12.1% | 10.8% |
| Widowed | 10.9% | 5.3% | 5.6% |
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| Household Size | 2.18 | 2.73 | 2.60 |
| Households | 527 | 2,221 | 124,010,992 |
| Family Households | 290 | 1,536 | 80,755,759 |
| Married couple, w/children | 33.4% | 33.1% | 30.5% |
| Married couple, no children | 56.2% | 46.6% | 42.9% |
| Non Family Households | 237 | 685 | 43,255,233 |
| Single householder, w/children | 6.6% | 10.2% | 15.8% |
| Single householder, no children | 3.8% | 10.1% | 10.8% |