| | Eureka, KS | Victor, ID | United States |
| Population | 2,295 | 3,315 | 329,725,481 |
| Female Population | 51.0% | 46.5% | 50.5% |
| Male Population | 49.0% | 53.5% | 49.5% |
| Median Age | 44.2 | 32.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,637 | 1,919 | 309,327,143 |
| Population - 2000 | 2,914 | 840 | 285,036,114 |
| Population - 1990 | 2,974 | 292 | 251,960,433 |
| Pop. 2000 to Now | -21.0% | 205.1% | 15.6% |
| Pop. 1990 to Now | -22.6% | 777.7% | 30.8% |
| space4 | | | |
| Population Density | 1,002.2 | 1,260.9 | 93.4 |
| Land Area | 2.3 | 2.6 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Eureka, KS | Victor, ID | United States |
| Age 0 to 4 | 6.2% | 8.5% | 5.9% |
| Age 5 to 9 | 9.2% | 8.6% | 6.1% |
| Age 10 to 14 | 5.0% | 7.8% | 6.6% |
| Age 15 to 17 | 2.9% | 3.0% | 3.9% |
| Age 18 to 20 | 0.0% | 3.2% | 4.0% |
| Age 21 to 24 | 4.0% | 3.8% | 5.2% |
| Age 25 to 34 | 11.3% | 18.4% | 13.8% |
| Age 35 to 44 | 13.6% | 17.6% | 12.9% |
| Age 45 to 54 | 10.3% | 14.2% | 12.6% |
| Age 55 to 59 | 7.2% | 5.1% | 6.7% |
| Age 60 to 64 | 6.4% | 2.2% | 6.3% |
| Age 65 to 74 | 13.6% | 6.8% | 9.6% |
| Age 75 to 84 | 5.1% | 0.5% | 4.5% |
| Age 85 and over | 5.1% | 0.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Eureka, KS | Victor, ID | United States |
| White | 89.2% | 72.2% | 59.4% |
| Black | 0.9% | 0.0% | 12.2% |
| Asian | 0.5% | 0.0% | 5.6% |
| Native American | 0.1% | 2.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 3.9% | 1.7% | 3.2% |
| Hispanic | 5.4% | 24.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Eureka, KS | Victor, ID | United States |
| Married Population | 48.0% | 40.6% | 49.8% |
| Currently Married | 43.4% | 38.6% | 48.0% |
| Married but Separated | 4.6% | 2.0% | 1.8% |
| Single Population | 52.0% | 59.4% | 50.2% |
| Never Married | 25.9% | 41.7% | 33.8% |
| Divorced | 16.6% | 10.5% | 10.8% |
| Widowed | 9.5% | 7.2% | 5.6% |
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| Household Size | 2.35 | 2.94 | 2.60 |
| Households | 946 | 1,128 | 124,010,992 |
| Family Households | 601 | 652 | 80,755,759 |
| Married couple, w/children | 21.0% | 39.3% | 30.5% |
| Married couple, no children | 37.1% | 31.6% | 42.9% |
| Non Family Households | 345 | 476 | 43,255,233 |
| Single householder, w/children | 32.6% | 23.6% | 15.8% |
| Single householder, no children | 9.3% | 5.5% | 10.8% |