| | Arthur, IL | Phelps, KY | United States |
| Population | 2,006 | 522 | 329,725,481 |
| Female Population | 55.8% | 34.9% | 50.5% |
| Male Population | 44.2% | 65.1% | 49.5% |
| Median Age | 47.3 | 55.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,286 | 877 | 309,327,143 |
| Population - 2000 | 2,203 | 1,053 | 285,036,114 |
| Population - 1990 | 2,112 | 1,298 | 251,960,433 |
| Pop. 2000 to Now | -0.5% | -33.2% | 15.6% |
| Pop. 1990 to Now | 3.8% | -45.8% | 30.8% |
| space4 | | | |
| Population Density | 1,512.8 | 65.3 | 93.4 |
| Land Area | 1.3 | 8.0 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Arthur, IL | Phelps, KY | United States |
| Age 0 to 4 | 7.2% | 0.0% | 5.9% |
| Age 5 to 9 | 5.2% | 0.0% | 6.1% |
| Age 10 to 14 | 4.3% | 0.0% | 6.6% |
| Age 15 to 17 | 3.5% | 0.0% | 3.9% |
| Age 18 to 20 | 2.0% | 0.0% | 4.0% |
| Age 21 to 24 | 2.3% | 0.0% | 5.2% |
| Age 25 to 34 | 12.5% | 20.1% | 13.8% |
| Age 35 to 44 | 10.8% | 7.3% | 12.9% |
| Age 45 to 54 | 11.2% | 20.7% | 12.6% |
| Age 55 to 59 | 5.4% | 25.7% | 6.7% |
| Age 60 to 64 | 4.0% | 8.6% | 6.3% |
| Age 65 to 74 | 11.5% | 14.4% | 9.6% |
| Age 75 to 84 | 12.1% | 3.3% | 4.5% |
| Age 85 and over | 8.2% | 0.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Arthur, IL | Phelps, KY | United States |
| White | 95.7% | 100.0% | 59.4% |
| Black | 0.5% | 0.0% | 12.2% |
| Asian | 0.2% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.2% | 0.0% | 0.4% |
| Two or More Races | 1.4% | 0.0% | 3.2% |
| Hispanic | 1.9% | 0.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Arthur, IL | Phelps, KY | United States |
| Married Population | 58.4% | 57.1% | 49.8% |
| Currently Married | 57.8% | 53.4% | 48.0% |
| Married but Separated | 0.7% | 3.6% | 1.8% |
| Single Population | 41.6% | 42.9% | 50.2% |
| Never Married | 18.2% | 24.1% | 33.8% |
| Divorced | 9.9% | 16.1% | 10.8% |
| Widowed | 13.5% | 2.7% | 5.6% |
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| Household Size | 2.09 | 2.31 | 2.60 |
| Households | 940 | 226 | 124,010,992 |
| Family Households | 534 | 158 | 80,755,759 |
| Married couple, w/children | 35.0% | 0.0% | 30.5% |
| Married couple, no children | 50.7% | 91.1% | 42.9% |
| Non Family Households | 406 | 68 | 43,255,233 |
| Single householder, w/children | 12.0% | 0.0% | 15.8% |
| Single householder, no children | 2.2% | 8.9% | 10.8% |