| | Pierce, ID | Kamiah, ID | United States |
| Population | 481 | 1,243 | 329,725,481 |
| Female Population | 40.3% | 58.5% | 50.5% |
| Male Population | 59.7% | 41.5% | 49.5% |
| Median Age | 51.6 | 46.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 505 | 1,293 | 309,327,143 |
| Population - 2000 | 617 | 1,160 | 285,036,114 |
| Population - 1990 | 746 | 1,157 | 251,960,433 |
| Pop. 2000 to Now | -5.2% | 7.0% | 15.6% |
| Pop. 1990 to Now | -21.6% | 7.3% | 30.8% |
| space4 | | | |
| Population Density | 583.0 | 1,132.1 | 93.4 |
| Land Area | 0.8 | 1.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Pierce, ID | Kamiah, ID | United States |
| Age 0 to 4 | 7.1% | 8.7% | 5.9% |
| Age 5 to 9 | 3.1% | 8.9% | 6.1% |
| Age 10 to 14 | 11.4% | 6.1% | 6.6% |
| Age 15 to 17 | 3.7% | 1.4% | 3.9% |
| Age 18 to 20 | 1.9% | 1.0% | 4.0% |
| Age 21 to 24 | 1.0% | 3.1% | 5.2% |
| Age 25 to 34 | 5.8% | 8.9% | 13.8% |
| Age 35 to 44 | 11.0% | 11.1% | 12.9% |
| Age 45 to 54 | 7.3% | 10.0% | 12.6% |
| Age 55 to 59 | 5.0% | 6.1% | 6.7% |
| Age 60 to 64 | 10.8% | 8.9% | 6.3% |
| Age 65 to 74 | 19.1% | 13.7% | 9.6% |
| Age 75 to 84 | 12.3% | 9.5% | 4.5% |
| Age 85 and over | 0.4% | 2.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Pierce, ID | Kamiah, ID | United States |
| White | 88.8% | 69.4% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.0% | 2.4% | 5.6% |
| Native American | 0.0% | 11.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 4.9% | 0.4% |
| Two or More Races | 2.9% | 3.6% | 3.2% |
| Hispanic | 8.3% | 8.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Pierce, ID | Kamiah, ID | United States |
| Married Population | 59.9% | 49.9% | 49.8% |
| Currently Married | 59.4% | 47.9% | 48.0% |
| Married but Separated | 0.5% | 2.0% | 1.8% |
| Single Population | 40.1% | 50.1% | 50.2% |
| Never Married | 11.4% | 17.9% | 33.8% |
| Divorced | 19.1% | 13.0% | 10.8% |
| Widowed | 9.5% | 19.2% | 5.6% |
| space5 | | | |
| Household Size | 2.31 | 2.27 | 2.60 |
| Households | 208 | 547 | 124,010,992 |
| Family Households | 117 | 266 | 80,755,759 |
| Married couple, w/children | 25.6% | 25.6% | 30.5% |
| Married couple, no children | 72.7% | 52.6% | 42.9% |
| Non Family Households | 91 | 281 | 43,255,233 |
| Single householder, w/children | 0.0% | 13.5% | 15.8% |
| Single householder, no children | 1.7% | 8.3% | 10.8% |