| Statistic | Ennis | Montana | National |
| Population | 721 | 1,068,778 | 328,239,523 |
| Population density (sq mi) | 976 | 7 | 91 |
| Median age | 51.6 | 39.8 | 37.7 |
| Male/Female ratio | 1.1:1 | 1.0:1 | 1.0:1 |
| Married (15yrs & older) | 53% | 58% | 55% |
| Families w/ Kids under 18 | 34% | 40% | 43% |
| Speak English | 97% | 96% | 79% |
| Speak Spanish | 1% | 1% | 13% |
| Race | Ennis | Montana | National |
| White | 91.40% | 89.11% | 73.35% |
| Black | 0.28% | 0.42% | 12.63% |
| Asian | 0.00% | 0.73% | 5.22% |
| American Indian | 0.00% | 6.57% | 0.82% |
| Native Hawaiian | 0.00% | 0.08% | 0.18% |
| Mixed race | 5.83% | 2.59% | 3.06% |
| Other race | 2.50% | 0.50% | 4.75% |
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