| | Soda Springs, ID | Lava Hot Springs, ID | United States |
| Population | 3,084 | 264 | 329,725,481 |
| Female Population | 49.6% | 48.1% | 50.5% |
| Male Population | 50.4% | 51.9% | 49.5% |
| Median Age | 35.6 | 50.2 | 38.4 |
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| Population - 2010 | 3,055 | 414 | 309,327,143 |
| Population - 2000 | 3,381 | 521 | 285,036,114 |
| Population - 1990 | 3,111 | 420 | 251,960,433 |
| Pop. 2000 to Now | -11.2% | -17.3% | 15.6% |
| Pop. 1990 to Now | -3.5% | 2.6% | 30.8% |
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| Population Density | 696.6 | 381.0 | 93.4 |
| Land Area | 4.4 | 0.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Soda Springs, ID | Lava Hot Springs, ID | United States |
| Age 0 to 4 | 9.1% | 2.3% | 5.9% |
| Age 5 to 9 | 7.9% | 3.4% | 6.1% |
| Age 10 to 14 | 11.4% | 9.1% | 6.6% |
| Age 15 to 17 | 2.2% | 0.0% | 3.9% |
| Age 18 to 20 | 1.8% | 1.5% | 4.0% |
| Age 21 to 24 | 3.6% | 6.1% | 5.2% |
| Age 25 to 34 | 12.3% | 5.7% | 13.8% |
| Age 35 to 44 | 15.5% | 11.4% | 12.9% |
| Age 45 to 54 | 7.8% | 20.1% | 12.6% |
| Age 55 to 59 | 5.4% | 10.6% | 6.7% |
| Age 60 to 64 | 8.4% | 10.2% | 6.3% |
| Age 65 to 74 | 7.7% | 14.4% | 9.6% |
| Age 75 to 84 | 4.8% | 5.3% | 4.5% |
| Age 85 and over | 2.0% | 0.0% | 1.9% |
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| Race | | | |
| | Soda Springs, ID | Lava Hot Springs, ID | United States |
| White | 97.0% | 93.9% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.5% | 0.0% | 5.6% |
| Native American | 0.0% | 1.5% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.9% | 4.5% | 3.2% |
| Hispanic | 0.6% | 0.0% | 18.4% |
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| Marriage & Family | | | |
| | Soda Springs, ID | Lava Hot Springs, ID | United States |
| Married Population | 57.2% | 32.9% | 49.8% |
| Currently Married | 56.9% | 32.9% | 48.0% |
| Married but Separated | 0.4% | 0.0% | 1.8% |
| Single Population | 42.8% | 67.1% | 50.2% |
| Never Married | 16.7% | 21.3% | 33.8% |
| Divorced | 16.6% | 41.8% | 10.8% |
| Widowed | 9.5% | 4.0% | 5.6% |
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| Household Size | 2.67 | 2.11 | 2.60 |
| Households | 1,128 | 125 | 124,010,992 |
| Family Households | 745 | 60 | 80,755,759 |
| Married couple, w/children | 38.1% | 15.0% | 30.5% |
| Married couple, no children | 43.9% | 36.7% | 42.9% |
| Non Family Households | 383 | 65 | 43,255,233 |
| Single householder, w/children | 13.8% | 33.3% | 15.8% |
| Single householder, no children | 4.2% | 15.0% | 10.8% |