| | Coal Valley, IL | Brook, IN | United States |
| Population | 3,835 | 959 | 329,725,481 |
| Female Population | 48.4% | 54.0% | 50.5% |
| Male Population | 51.6% | 46.0% | 49.5% |
| Median Age | 48.6 | 37.3 | 38.4 |
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| Population - 2010 | 3,742 | 1,000 | 309,327,143 |
| Population - 2000 | 3,606 | 1,062 | 285,036,114 |
| Population - 1990 | 2,683 | 899 | 251,960,433 |
| Pop. 2000 to Now | 3.1% | -11.4% | 15.6% |
| Pop. 1990 to Now | 38.6% | 4.7% | 30.8% |
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| Population Density | 1,229.6 | 1,416.5 | 93.4 |
| Land Area | 3.1 | 0.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Coal Valley, IL | Brook, IN | United States |
| Age 0 to 4 | 2.6% | 5.7% | 5.9% |
| Age 5 to 9 | 5.4% | 6.8% | 6.1% |
| Age 10 to 14 | 10.5% | 6.2% | 6.6% |
| Age 15 to 17 | 3.9% | 3.8% | 3.9% |
| Age 18 to 20 | 0.9% | 5.3% | 4.0% |
| Age 21 to 24 | 2.4% | 3.7% | 5.2% |
| Age 25 to 34 | 5.6% | 12.5% | 13.8% |
| Age 35 to 44 | 14.2% | 17.2% | 12.9% |
| Age 45 to 54 | 14.6% | 10.0% | 12.6% |
| Age 55 to 59 | 7.6% | 5.8% | 6.7% |
| Age 60 to 64 | 9.1% | 4.7% | 6.3% |
| Age 65 to 74 | 14.7% | 9.3% | 9.6% |
| Age 75 to 84 | 7.4% | 7.4% | 4.5% |
| Age 85 and over | 1.1% | 1.7% | 1.9% |
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| Race | | | |
| | Coal Valley, IL | Brook, IN | United States |
| White | 94.3% | 87.8% | 59.4% |
| Black | 0.1% | 0.0% | 12.2% |
| Asian | 0.8% | 0.0% | 5.6% |
| Native American | 0.0% | 0.4% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.0% | 1.1% | 3.2% |
| Hispanic | 4.8% | 10.6% | 18.4% |
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| Marriage & Family | | | |
| | Coal Valley, IL | Brook, IN | United States |
| Married Population | 69.5% | 44.9% | 49.8% |
| Currently Married | 68.7% | 41.5% | 48.0% |
| Married but Separated | 0.9% | 3.3% | 1.8% |
| Single Population | 30.5% | 55.1% | 50.2% |
| Never Married | 12.2% | 24.5% | 33.8% |
| Divorced | 10.5% | 20.9% | 10.8% |
| Widowed | 7.7% | 9.7% | 5.6% |
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| Household Size | 2.37 | 2.80 | 2.60 |
| Households | 1,615 | 342 | 124,010,992 |
| Family Households | 1,197 | 231 | 80,755,759 |
| Married couple, w/children | 25.8% | 27.3% | 30.5% |
| Married couple, no children | 61.2% | 39.0% | 42.9% |
| Non Family Households | 418 | 111 | 43,255,233 |
| Single householder, w/children | 5.8% | 16.9% | 15.8% |
| Single householder, no children | 7.3% | 16.9% | 10.8% |