| | Lenox, MA | Ennis, MT | United States |
| Population | 5,089 | 673 | 329,725,481 |
| Female Population | 51.2% | 45.6% | 50.5% |
| Male Population | 48.8% | 54.4% | 49.5% |
| Median Age | 56.6 | 58.2 | 38.4 |
| space3 | | | |
| Population - 2010 | 5,069 | 839 | 309,327,143 |
| Population - 2000 | 5,077 | 840 | 285,036,114 |
| Population - 1990 | 5,069 | 773 | 251,960,433 |
| Pop. 2000 to Now | -2.8% | 24.1% | 15.6% |
| Pop. 1990 to Now | -2.7% | 34.8% | 30.8% |
| space4 | | | |
| Population Density | 239.8 | 911.9 | 93.4 |
| Land Area | 21.2 | 0.7 | 3,531,905.4 |
| Water Area | 0.5 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Lenox, MA | Ennis, MT | United States |
| Age 0 to 4 | 1.0% | 0.0% | 5.9% |
| Age 5 to 9 | 3.3% | 6.4% | 6.1% |
| Age 10 to 14 | 1.4% | 0.0% | 6.6% |
| Age 15 to 17 | 3.3% | 0.6% | 3.9% |
| Age 18 to 20 | 7.9% | 0.0% | 4.0% |
| Age 21 to 24 | 4.2% | 0.0% | 5.2% |
| Age 25 to 34 | 7.1% | 11.6% | 13.8% |
| Age 35 to 44 | 9.8% | 14.9% | 12.9% |
| Age 45 to 54 | 9.7% | 15.9% | 12.6% |
| Age 55 to 59 | 7.0% | 5.6% | 6.7% |
| Age 60 to 64 | 8.1% | 11.3% | 6.3% |
| Age 65 to 74 | 17.5% | 20.5% | 9.6% |
| Age 75 to 84 | 11.3% | 6.8% | 4.5% |
| Age 85 and over | 8.5% | 6.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Lenox, MA | Ennis, MT | United States |
| White | 91.4% | 94.1% | 59.4% |
| Black | 1.7% | 0.3% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 2.1% | 0.4% |
| Two or More Races | 2.0% | 0.0% | 3.2% |
| Hispanic | 4.9% | 3.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Lenox, MA | Ennis, MT | United States |
| Married Population | 40.0% | 50.6% | 49.8% |
| Currently Married | 36.4% | 46.8% | 48.0% |
| Married but Separated | 3.6% | 3.8% | 1.8% |
| Single Population | 60.0% | 49.4% | 50.2% |
| Never Married | 34.8% | 25.6% | 33.8% |
| Divorced | 14.1% | 15.4% | 10.8% |
| Widowed | 11.1% | 8.4% | 5.6% |
| space5 | | | |
| Household Size | 2.13 | 1.74 | 2.60 |
| Households | 2,211 | 366 | 124,010,992 |
| Family Households | 1,234 | 132 | 80,755,759 |
| Married couple, w/children | 4.4% | 18.9% | 30.5% |
| Married couple, no children | 63.4% | 81.1% | 42.9% |
| Non Family Households | 977 | 234 | 43,255,233 |
| Single householder, w/children | 15.2% | 0.0% | 15.8% |
| Single householder, no children | 17.1% | 0.0% | 10.8% |