| | Moyie Springs, ID | Heron, MT | United States |
| Population | 1,174 | 273 | 329,725,481 |
| Female Population | 47.4% | 50.9% | 50.5% |
| Male Population | 52.6% | 49.1% | 49.5% |
| Median Age | 42.9 | 31.7 | 38.4 |
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| Population - 2010 | 722 | 235 | 309,327,143 |
| Population - 2000 | 656 | 149 | 285,036,114 |
| Population - 1990 | 415 | 181 | 251,960,433 |
| Pop. 2000 to Now | 21.2% | 40.3% | 15.6% |
| Pop. 1990 to Now | 91.6% | 15.5% | 30.8% |
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| Population Density | 778.5 | 53.6 | 93.4 |
| Land Area | 1.5 | 5.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Moyie Springs, ID | Heron, MT | United States |
| Age 0 to 4 | 6.6% | 22.0% | 5.9% |
| Age 5 to 9 | 7.3% | 8.4% | 6.1% |
| Age 10 to 14 | 6.0% | 0.0% | 6.6% |
| Age 15 to 17 | 6.2% | 2.2% | 3.9% |
| Age 18 to 20 | 7.8% | 0.0% | 4.0% |
| Age 21 to 24 | 1.3% | 0.0% | 5.2% |
| Age 25 to 34 | 5.1% | 26.4% | 13.8% |
| Age 35 to 44 | 12.7% | 0.7% | 12.9% |
| Age 45 to 54 | 14.0% | 3.3% | 12.6% |
| Age 55 to 59 | 6.1% | 5.9% | 6.7% |
| Age 60 to 64 | 7.9% | 8.8% | 6.3% |
| Age 65 to 74 | 18.0% | 12.1% | 9.6% |
| Age 75 to 84 | 0.6% | 6.6% | 4.5% |
| Age 85 and over | 0.4% | 3.7% | 1.9% |
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| Race | | | |
| | Moyie Springs, ID | Heron, MT | United States |
| White | 94.9% | 97.8% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.1% | 0.0% | 5.6% |
| Native American | 0.3% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.4% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 3.4% | 0.0% | 3.2% |
| Hispanic | 0.9% | 2.2% | 18.4% |
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| Marriage & Family | | | |
| | Moyie Springs, ID | Heron, MT | United States |
| Married Population | 55.3% | 72.6% | 49.8% |
| Currently Married | 54.8% | 72.6% | 48.0% |
| Married but Separated | 0.5% | 0.0% | 1.8% |
| Single Population | 44.7% | 27.4% | 50.2% |
| Never Married | 22.8% | 10.0% | 33.8% |
| Divorced | 20.6% | 10.0% | 10.8% |
| Widowed | 1.3% | 7.4% | 5.6% |
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| Household Size | 2.69 | 2.81 | 2.60 |
| Households | 437 | 97 | 124,010,992 |
| Family Households | 382 | 65 | 80,755,759 |
| Married couple, w/children | 27.0% | 41.5% | 30.5% |
| Married couple, no children | 40.1% | 50.8% | 42.9% |
| Non Family Households | 55 | 32 | 43,255,233 |
| Single householder, w/children | 8.1% | 7.7% | 15.8% |
| Single householder, no children | 24.9% | 0.0% | 10.8% |