| Statistic | Waltham | Minnesota | National |
| Population | 168 | 5,639,632 | 328,239,523 |
| Population density (sq mi) | 352 | 72 | 91 |
| Median age | 34.0 | 37.8 | 37.7 |
| Male/Female ratio | 1.2:1 | 1.0:1 | 1.0:1 |
| Married (15yrs & older) | 63% | 58% | 55% |
| Families w/ Kids under 18 | 67% | 45% | 43% |
| Speak English | 96% | 89% | 79% |
| Speak Spanish | 4% | 4% | 13% |
| Race | Waltham | Minnesota | National |
| White | 100.00% | 84.34% | 73.35% |
| Black | 0.00% | 5.70% | 12.63% |
| Asian | 0.00% | 4.53% | 5.22% |
| American Indian | 0.00% | 1.04% | 0.82% |
| Native Hawaiian | 0.00% | 0.04% | 0.18% |
| Mixed race | 0.00% | 2.72% | 3.06% |
| Other race | 0.00% | 1.62% | 4.75% |
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