| Statistic | St. Charles | Idaho | National |
| Population | 160 | 1,787,065 | 328,239,523 |
| Population density (sq mi) | 218 | 22 | 91 |
| Median age | 46.4 | 35.7 | 37.7 |
| Male/Female ratio | 1.2:1 | 1.0:1 | 1.0:1 |
| Married (15yrs & older) | 73% | 60% | 55% |
| Families w/ Kids under 18 | 49% | 45% | 43% |
| Speak English | 100% | 89% | 79% |
| Speak Spanish | 0% | 8% | 13% |
| Race | St. Charles | Idaho | National |
| White | 88.75% | 91.30% | 73.35% |
| Black | 0.00% | 0.64% | 12.63% |
| Asian | 5.63% | 1.32% | 5.22% |
| American Indian | 5.63% | 1.31% | 0.82% |
| Native Hawaiian | 0.00% | 0.12% | 0.18% |
| Mixed race | 0.00% | 2.57% | 3.06% |
| Other race | 0.00% | 2.74% | 4.75% |
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