| Statistic | Rock River | Wyoming | National |
| Population | 258 | 578,759 | 328,239,523 |
| Population density (sq mi) | 111 | 6 | 91 |
| Median age | 29.5 | 36.8 | 37.7 |
| Male/Female ratio | 1.5:1 | 1.0:1 | 1.0:1 |
| Married (15yrs & older) | 48% | 59% | 55% |
| Families w/ Kids under 18 | 49% | 43% | 43% |
| Speak English | 97% | 93% | 79% |
| Speak Spanish | 0% | 5% | 13% |
| Race | Rock River | Wyoming | National |
| White | 93.80% | 91.22% | 73.35% |
| Black | 0.00% | 1.10% | 12.63% |
| Asian | 2.71% | 0.92% | 5.22% |
| American Indian | 0.39% | 2.24% | 0.82% |
| Native Hawaiian | 3.10% | 0.07% | 0.18% |
| Mixed race | 0.00% | 2.66% | 3.06% |
| Other race | 0.00% | 1.78% | 4.75% |
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