| | Eureka, KS | Chanute, KS | United States |
| Population | 2,295 | 8,737 | 329,725,481 |
| Female Population | 51.0% | 52.3% | 50.5% |
| Male Population | 49.0% | 47.7% | 49.5% |
| Median Age | 44.2 | 37.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,637 | 9,110 | 309,327,143 |
| Population - 2000 | 2,914 | 9,411 | 285,036,114 |
| Population - 1990 | 2,974 | 9,488 | 251,960,433 |
| Pop. 2000 to Now | -21.0% | -4.5% | 15.6% |
| Pop. 1990 to Now | -22.6% | -5.2% | 30.8% |
| space4 | | | |
| Population Density | 1,002.2 | 1,230.7 | 93.4 |
| Land Area | 2.3 | 7.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Eureka, KS | Chanute, KS | United States |
| Age 0 to 4 | 6.2% | 5.7% | 5.9% |
| Age 5 to 9 | 9.2% | 5.2% | 6.1% |
| Age 10 to 14 | 5.0% | 10.0% | 6.6% |
| Age 15 to 17 | 2.9% | 5.7% | 3.9% |
| Age 18 to 20 | 0.0% | 4.4% | 4.0% |
| Age 21 to 24 | 4.0% | 4.9% | 5.2% |
| Age 25 to 34 | 11.3% | 10.8% | 13.8% |
| Age 35 to 44 | 13.6% | 12.5% | 12.9% |
| Age 45 to 54 | 10.3% | 10.4% | 12.6% |
| Age 55 to 59 | 7.2% | 4.8% | 6.7% |
| Age 60 to 64 | 6.4% | 6.4% | 6.3% |
| Age 65 to 74 | 13.6% | 12.1% | 9.6% |
| Age 75 to 84 | 5.1% | 4.1% | 4.5% |
| Age 85 and over | 5.1% | 3.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Eureka, KS | Chanute, KS | United States |
| White | 89.2% | 88.3% | 59.4% |
| Black | 0.9% | 1.4% | 12.2% |
| Asian | 0.5% | 0.1% | 5.6% |
| Native American | 0.1% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 3.9% | 2.2% | 3.2% |
| Hispanic | 5.4% | 7.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Eureka, KS | Chanute, KS | United States |
| Married Population | 48.0% | 45.8% | 49.8% |
| Currently Married | 43.4% | 43.3% | 48.0% |
| Married but Separated | 4.6% | 2.5% | 1.8% |
| Single Population | 52.0% | 54.2% | 50.2% |
| Never Married | 25.9% | 28.8% | 33.8% |
| Divorced | 16.6% | 19.0% | 10.8% |
| Widowed | 9.5% | 6.4% | 5.6% |
| space5 | | | |
| Household Size | 2.35 | 2.43 | 2.60 |
| Households | 946 | 3,452 | 124,010,992 |
| Family Households | 601 | 2,289 | 80,755,759 |
| Married couple, w/children | 21.0% | 27.3% | 30.5% |
| Married couple, no children | 37.1% | 39.3% | 42.9% |
| Non Family Households | 345 | 1,163 | 43,255,233 |
| Single householder, w/children | 32.6% | 29.8% | 15.8% |
| Single householder, no children | 9.3% | 3.6% | 10.8% |