| | American Falls, ID | Jerome, ID | United States |
| Population | 4,531 | 12,182 | 329,725,481 |
| Female Population | 53.9% | 49.6% | 50.5% |
| Male Population | 46.1% | 50.4% | 49.5% |
| Median Age | 34.8 | 31.1 | 38.4 |
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| Population - 2010 | 4,480 | 10,923 | 309,327,143 |
| Population - 2000 | 4,111 | 7,780 | 285,036,114 |
| Population - 1990 | 3,757 | 6,529 | 251,960,433 |
| Pop. 2000 to Now | 4.6% | 55.6% | 15.6% |
| Pop. 1990 to Now | 14.4% | 85.4% | 30.8% |
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| Population Density | 2,807.3 | 2,184.3 | 93.4 |
| Land Area | 1.6 | 5.6 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | American Falls, ID | Jerome, ID | United States |
| Age 0 to 4 | 8.0% | 8.3% | 5.9% |
| Age 5 to 9 | 9.3% | 8.6% | 6.1% |
| Age 10 to 14 | 9.1% | 10.4% | 6.6% |
| Age 15 to 17 | 4.7% | 4.9% | 3.9% |
| Age 18 to 20 | 3.6% | 3.9% | 4.0% |
| Age 21 to 24 | 3.4% | 5.4% | 5.2% |
| Age 25 to 34 | 12.3% | 14.9% | 13.8% |
| Age 35 to 44 | 12.6% | 14.9% | 12.9% |
| Age 45 to 54 | 10.8% | 9.2% | 12.6% |
| Age 55 to 59 | 5.9% | 4.7% | 6.7% |
| Age 60 to 64 | 6.8% | 5.1% | 6.3% |
| Age 65 to 74 | 6.7% | 5.8% | 9.6% |
| Age 75 to 84 | 5.4% | 2.8% | 4.5% |
| Age 85 and over | 1.3% | 1.3% | 1.9% |
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| Race | | | |
| | American Falls, ID | Jerome, ID | United States |
| White | 50.8% | 54.9% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.0% | 0.1% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.3% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 0.1% | 2.9% | 3.2% |
| Hispanic | 49.1% | 41.6% | 18.4% |
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| Marriage & Family | | | |
| | American Falls, ID | Jerome, ID | United States |
| Married Population | 57.9% | 50.6% | 49.8% |
| Currently Married | 57.7% | 50.2% | 48.0% |
| Married but Separated | 0.2% | 0.4% | 1.8% |
| Single Population | 42.1% | 49.4% | 50.2% |
| Never Married | 26.6% | 31.9% | 33.8% |
| Divorced | 11.5% | 14.0% | 10.8% |
| Widowed | 4.0% | 3.6% | 5.6% |
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| Household Size | 2.95 | 3.00 | 2.60 |
| Households | 1,523 | 4,022 | 124,010,992 |
| Family Households | 1,136 | 3,034 | 80,755,759 |
| Married couple, w/children | 28.7% | 42.7% | 30.5% |
| Married couple, no children | 47.5% | 23.2% | 42.9% |
| Non Family Households | 387 | 988 | 43,255,233 |
| Single householder, w/children | 11.9% | 23.9% | 15.8% |
| Single householder, no children | 11.9% | 10.2% | 10.8% |