| | Phoenix, IL | Pekin, IL | United States |
| Population | 1,314 | 32,398 | 329,725,481 |
| Female Population | 54.3% | 50.9% | 50.5% |
| Male Population | 45.7% | 49.1% | 49.5% |
| Median Age | 43.3 | 41.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,976 | 34,041 | 309,327,143 |
| Population - 2000 | 2,157 | 33,857 | 285,036,114 |
| Population - 1990 | 2,217 | 32,254 | 251,960,433 |
| Pop. 2000 to Now | -12.7% | -6.1% | 15.6% |
| Pop. 1990 to Now | -15.0% | -1.4% | 30.8% |
| space4 | | | |
| Population Density | 2,831.9 | 2,216.0 | 93.4 |
| Land Area | 0.5 | 14.6 | 3,531,905.4 |
| Water Area | 0.0 | 0.8 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Phoenix, IL | Pekin, IL | United States |
| Age 0 to 4 | 3.0% | 5.9% | 5.9% |
| Age 5 to 9 | 10.9% | 6.8% | 6.1% |
| Age 10 to 14 | 6.5% | 5.0% | 6.6% |
| Age 15 to 17 | 0.8% | 3.5% | 3.9% |
| Age 18 to 20 | 4.3% | 2.5% | 4.0% |
| Age 21 to 24 | 3.3% | 4.9% | 5.2% |
| Age 25 to 34 | 10.7% | 13.9% | 13.8% |
| Age 35 to 44 | 12.9% | 11.5% | 12.9% |
| Age 45 to 54 | 8.3% | 12.9% | 12.6% |
| Age 55 to 59 | 9.8% | 7.2% | 6.7% |
| Age 60 to 64 | 9.2% | 7.7% | 6.3% |
| Age 65 to 74 | 14.4% | 11.1% | 9.6% |
| Age 75 to 84 | 4.3% | 4.4% | 4.5% |
| Age 85 and over | 1.8% | 2.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Phoenix, IL | Pekin, IL | United States |
| White | 0.2% | 90.8% | 59.4% |
| Black | 78.7% | 3.0% | 12.2% |
| Asian | 0.0% | 0.5% | 5.6% |
| Native American | 0.0% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 3.3% | 0.0% | 0.4% |
| Two or More Races | 1.1% | 2.8% | 3.2% |
| Hispanic | 16.8% | 2.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Phoenix, IL | Pekin, IL | United States |
| Married Population | 22.4% | 43.2% | 49.8% |
| Currently Married | 17.1% | 41.5% | 48.0% |
| Married but Separated | 5.3% | 1.6% | 1.8% |
| Single Population | 77.7% | 56.8% | 50.2% |
| Never Married | 41.5% | 33.2% | 33.8% |
| Divorced | 22.9% | 15.0% | 10.8% |
| Widowed | 13.3% | 8.7% | 5.6% |
| space5 | | | |
| Household Size | 2.17 | 2.24 | 2.60 |
| Households | 606 | 13,706 | 124,010,992 |
| Family Households | 241 | 7,504 | 80,755,759 |
| Married couple, w/children | 6.2% | 26.0% | 30.5% |
| Married couple, no children | 20.3% | 42.5% | 42.9% |
| Non Family Households | 365 | 6,202 | 43,255,233 |
| Single householder, w/children | 39.0% | 20.1% | 15.8% |
| Single householder, no children | 34.4% | 11.4% | 10.8% |