| Statistic | Darby | Montana | National |
| Population | 685 | 1,068,778 | 328,239,523 |
| Population density (sq mi) | 1,090 | 7 | 91 |
| Median age | 40.7 | 39.8 | 37.7 |
| Male/Female ratio | 1.1:1 | 1.0:1 | 1.0:1 |
| Married (15yrs & older) | 45% | 58% | 55% |
| Families w/ Kids under 18 | 31% | 40% | 43% |
| Speak English | 95% | 96% | 79% |
| Speak Spanish | 3% | 1% | 13% |
| Race | Darby | Montana | National |
| White | 83.36% | 89.11% | 73.35% |
| Black | 0.15% | 0.42% | 12.63% |
| Asian | 6.42% | 0.73% | 5.22% |
| American Indian | 1.61% | 6.57% | 0.82% |
| Native Hawaiian | 0.00% | 0.08% | 0.18% |
| Mixed race | 8.47% | 2.59% | 3.06% |
| Other race | 0.00% | 0.50% | 4.75% |
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