| | Weiser, ID | New Plymouth, ID | United States |
| Population | 5,578 | 1,633 | 329,725,481 |
| Female Population | 50.9% | 50.5% | 50.5% |
| Male Population | 49.1% | 49.5% | 49.5% |
| Median Age | 40.4 | 37.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 5,486 | 1,506 | 309,327,143 |
| Population - 2000 | 5,343 | 1,400 | 285,036,114 |
| Population - 1990 | 4,571 | 1,313 | 251,960,433 |
| Pop. 2000 to Now | 2.3% | 14.9% | 15.6% |
| Pop. 1990 to Now | 19.5% | 22.5% | 30.8% |
| space4 | | | |
| Population Density | 1,871.2 | 2,373.6 | 93.4 |
| Land Area | 3.0 | 0.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Weiser, ID | New Plymouth, ID | United States |
| Age 0 to 4 | 4.5% | 8.4% | 5.9% |
| Age 5 to 9 | 9.5% | 6.1% | 6.1% |
| Age 10 to 14 | 5.6% | 8.5% | 6.6% |
| Age 15 to 17 | 2.4% | 4.4% | 3.9% |
| Age 18 to 20 | 2.3% | 3.1% | 4.0% |
| Age 21 to 24 | 3.9% | 5.3% | 5.2% |
| Age 25 to 34 | 12.9% | 13.0% | 13.8% |
| Age 35 to 44 | 12.3% | 13.2% | 12.9% |
| Age 45 to 54 | 9.5% | 11.0% | 12.6% |
| Age 55 to 59 | 6.0% | 5.9% | 6.7% |
| Age 60 to 64 | 7.7% | 6.1% | 6.3% |
| Age 65 to 74 | 13.6% | 6.4% | 9.6% |
| Age 75 to 84 | 7.9% | 6.1% | 4.5% |
| Age 85 and over | 1.9% | 2.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Weiser, ID | New Plymouth, ID | United States |
| White | 64.4% | 76.5% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.1% | 1.1% | 5.6% |
| Native American | 0.7% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.6% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 5.8% | 4.5% | 3.2% |
| Hispanic | 28.3% | 17.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Weiser, ID | New Plymouth, ID | United States |
| Married Population | 50.6% | 61.1% | 49.8% |
| Currently Married | 47.4% | 57.7% | 48.0% |
| Married but Separated | 3.1% | 3.4% | 1.8% |
| Single Population | 49.4% | 38.9% | 50.2% |
| Never Married | 24.3% | 17.7% | 33.8% |
| Divorced | 18.1% | 15.1% | 10.8% |
| Widowed | 7.1% | 6.0% | 5.6% |
| space5 | | | |
| Household Size | 2.35 | 2.41 | 2.60 |
| Households | 2,332 | 677 | 124,010,992 |
| Family Households | 1,513 | 505 | 80,755,759 |
| Married couple, w/children | 23.2% | 50.1% | 30.5% |
| Married couple, no children | 41.4% | 29.7% | 42.9% |
| Non Family Households | 819 | 172 | 43,255,233 |
| Single householder, w/children | 26.6% | 13.1% | 15.8% |
| Single householder, no children | 8.8% | 7.1% | 10.8% |