| | Attica, KS | Ignacio, CO | United States |
| Population | 666 | 1,319 | 329,725,481 |
| Female Population | 54.7% | 50.1% | 50.5% |
| Male Population | 45.4% | 49.9% | 49.5% |
| Median Age | 41.5 | 37.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 624 | 862 | 309,327,143 |
| Population - 2000 | 636 | 669 | 285,036,114 |
| Population - 1990 | 716 | 720 | 251,960,433 |
| Pop. 2000 to Now | -14.0% | 44.0% | 15.6% |
| Pop. 1990 to Now | -23.6% | 33.8% | 30.8% |
| space4 | | | |
| Population Density | 1,050.5 | 3,053.2 | 93.4 |
| Land Area | 0.6 | 0.4 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Attica, KS | Ignacio, CO | United States |
| Age 0 to 4 | 5.9% | 6.7% | 5.9% |
| Age 5 to 9 | 4.1% | 6.4% | 6.1% |
| Age 10 to 14 | 9.8% | 8.9% | 6.6% |
| Age 15 to 17 | 11.6% | 2.6% | 3.9% |
| Age 18 to 20 | 4.5% | 2.1% | 4.0% |
| Age 21 to 24 | 2.9% | 4.9% | 5.2% |
| Age 25 to 34 | 8.7% | 16.2% | 13.8% |
| Age 35 to 44 | 8.3% | 13.0% | 12.9% |
| Age 45 to 54 | 7.4% | 12.2% | 12.6% |
| Age 55 to 59 | 8.6% | 8.7% | 6.7% |
| Age 60 to 64 | 11.1% | 6.4% | 6.3% |
| Age 65 to 74 | 10.5% | 7.6% | 9.6% |
| Age 75 to 84 | 5.7% | 3.0% | 4.5% |
| Age 85 and over | 1.2% | 1.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Attica, KS | Ignacio, CO | United States |
| White | 83.3% | 41.6% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.0% | 0.3% | 5.6% |
| Native American | 0.8% | 15.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.0% | 3.4% | 3.2% |
| Hispanic | 15.9% | 39.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Attica, KS | Ignacio, CO | United States |
| Married Population | 50.3% | 45.6% | 49.8% |
| Currently Married | 46.9% | 42.8% | 48.0% |
| Married but Separated | 3.4% | 2.8% | 1.8% |
| Single Population | 49.7% | 54.4% | 50.2% |
| Never Married | 26.2% | 33.1% | 33.8% |
| Divorced | 16.3% | 17.1% | 10.8% |
| Widowed | 7.3% | 4.2% | 5.6% |
| space5 | | | |
| Household Size | 2.63 | 2.74 | 2.60 |
| Households | 247 | 481 | 124,010,992 |
| Family Households | 181 | 298 | 80,755,759 |
| Married couple, w/children | 22.7% | 25.5% | 30.5% |
| Married couple, no children | 38.1% | 37.9% | 42.9% |
| Non Family Households | 66 | 183 | 43,255,233 |
| Single householder, w/children | 36.5% | 25.8% | 15.8% |
| Single householder, no children | 2.8% | 10.7% | 10.8% |