| | Tiskilwa, IL | Mayer, AZ | United States |
| Population | 709 | 1,105 | 329,725,481 |
| Female Population | 51.1% | 47.8% | 50.5% |
| Male Population | 48.9% | 52.2% | 49.5% |
| Median Age | 43.6 | 54.5 | 38.4 |
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| Population - 2010 | 839 | 944 | 309,327,143 |
| Population - 2000 | 787 | 1,408 | 285,036,114 |
| Population - 1990 | 830 | 1,017 | 251,960,433 |
| Pop. 2000 to Now | -3.4% | 50.4% | 15.6% |
| Pop. 1990 to Now | -8.4% | 108.2% | 30.8% |
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| Population Density | 1,558.2 | 55.0 | 93.4 |
| Land Area | 0.5 | 20.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Tiskilwa, IL | Mayer, AZ | United States |
| Age 0 to 4 | 5.4% | 9.0% | 5.9% |
| Age 5 to 9 | 5.8% | 7.2% | 6.1% |
| Age 10 to 14 | 4.4% | 2.8% | 6.6% |
| Age 15 to 17 | 7.6% | 0.0% | 3.9% |
| Age 18 to 20 | 2.8% | 0.0% | 4.0% |
| Age 21 to 24 | 7.6% | 2.3% | 5.2% |
| Age 25 to 34 | 7.3% | 4.8% | 13.8% |
| Age 35 to 44 | 9.9% | 1.8% | 12.9% |
| Age 45 to 54 | 17.3% | 25.1% | 12.6% |
| Age 55 to 59 | 4.4% | 6.0% | 6.7% |
| Age 60 to 64 | 6.6% | 11.8% | 6.3% |
| Age 65 to 74 | 8.0% | 17.2% | 9.6% |
| Age 75 to 84 | 10.3% | 12.1% | 4.5% |
| Age 85 and over | 2.5% | 0.0% | 1.9% |
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| Race | | | |
| | Tiskilwa, IL | Mayer, AZ | United States |
| White | 86.9% | 96.4% | 59.4% |
| Black | 0.6% | 0.0% | 12.2% |
| Asian | 5.6% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.8% | 0.0% | 3.2% |
| Hispanic | 5.1% | 3.6% | 18.4% |
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| Marriage & Family | | | |
| | Tiskilwa, IL | Mayer, AZ | United States |
| Married Population | 48.2% | 54.6% | 49.8% |
| Currently Married | 46.4% | 54.6% | 48.0% |
| Married but Separated | 1.8% | 0.0% | 1.8% |
| Single Population | 51.8% | 45.4% | 50.2% |
| Never Married | 30.2% | 13.0% | 33.8% |
| Divorced | 11.9% | 20.1% | 10.8% |
| Widowed | 9.7% | 12.3% | 5.6% |
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| Household Size | 2.37 | 2.14 | 2.60 |
| Households | 299 | 516 | 124,010,992 |
| Family Households | 188 | 296 | 80,755,759 |
| Married couple, w/children | 29.8% | 8.8% | 30.5% |
| Married couple, no children | 42.0% | 67.6% | 42.9% |
| Non Family Households | 111 | 220 | 43,255,233 |
| Single householder, w/children | 16.5% | 23.6% | 15.8% |
| Single householder, no children | 11.7% | 0.0% | 10.8% |