| Statistic | Petersburg | North Dakota | National |
| Population | 159 | 762,062 | 328,239,523 |
| Population density (sq mi) | 155 | 11 | 91 |
| Median age | 40.9 | 35.2 | 37.7 |
| Male/Female ratio | 0.8:1 | 1.1:1 | 1.0:1 |
| Married (15yrs & older) | 53% | 58% | 55% |
| Families w/ Kids under 18 | 58% | 44% | 43% |
| Speak English | 91% | 94% | 79% |
| Speak Spanish | 3% | 2% | 13% |
| Race | Petersburg | North Dakota | National |
| White | 80.50% | 88.26% | 73.35% |
| Black | 1.89% | 2.01% | 12.63% |
| Asian | 5.03% | 1.26% | 5.22% |
| American Indian | 0.00% | 5.21% | 0.82% |
| Native Hawaiian | 0.00% | 0.05% | 0.18% |
| Mixed race | 11.32% | 2.44% | 3.06% |
| Other race | 1.26% | 0.77% | 4.75% |
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