| | Madisonville, KY | Princeton, KY | United States |
| Population | 19,533 | 6,206 | 329,725,481 |
| Female Population | 50.6% | 53.0% | 50.5% |
| Male Population | 49.5% | 47.0% | 49.5% |
| Median Age | 36.6 | 38 | 38.4 |
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| Population - 2010 | 19,794 | 6,341 | 309,327,143 |
| Population - 2000 | 19,307 | 6,536 | 285,036,114 |
| Population - 1990 | 16,200 | 6,940 | 251,960,433 |
| Pop. 2000 to Now | -3.4% | -7.2% | 15.6% |
| Pop. 1990 to Now | 15.2% | -12.6% | 30.8% |
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| Population Density | 1,093.6 | 690.7 | 93.4 |
| Land Area | 17.9 | 9.0 | 3,531,905.4 |
| Water Area | 0.8 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Madisonville, KY | Princeton, KY | United States |
| Age 0 to 4 | 6.6% | 8.6% | 5.9% |
| Age 5 to 9 | 7.5% | 7.2% | 6.1% |
| Age 10 to 14 | 6.8% | 6.0% | 6.6% |
| Age 15 to 17 | 4.3% | 4.7% | 3.9% |
| Age 18 to 20 | 2.4% | 4.3% | 4.0% |
| Age 21 to 24 | 5.8% | 5.3% | 5.2% |
| Age 25 to 34 | 13.7% | 11.3% | 13.8% |
| Age 35 to 44 | 11.2% | 10.0% | 12.9% |
| Age 45 to 54 | 12.9% | 11.1% | 12.6% |
| Age 55 to 59 | 5.1% | 6.1% | 6.7% |
| Age 60 to 64 | 5.8% | 4.5% | 6.3% |
| Age 65 to 74 | 10.7% | 10.0% | 9.6% |
| Age 75 to 84 | 5.8% | 6.3% | 4.5% |
| Age 85 and over | 1.4% | 4.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Madisonville, KY | Princeton, KY | United States |
| White | 79.6% | 82.7% | 59.4% |
| Black | 10.6% | 11.4% | 12.2% |
| Asian | 1.5% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.1% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 4.7% | 2.9% | 3.2% |
| Hispanic | 3.5% | 2.9% | 18.4% |
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| Marriage & Family | | | |
| | Madisonville, KY | Princeton, KY | United States |
| Married Population | 48.4% | 44.9% | 49.8% |
| Currently Married | 45.7% | 43.3% | 48.0% |
| Married but Separated | 2.7% | 1.7% | 1.8% |
| Single Population | 51.6% | 55.1% | 50.2% |
| Never Married | 26.4% | 28.2% | 33.8% |
| Divorced | 17.6% | 14.4% | 10.8% |
| Widowed | 7.6% | 12.5% | 5.6% |
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| Household Size | 2.34 | 2.41 | 2.60 |
| Households | 8,068 | 2,535 | 124,010,992 |
| Family Households | 4,942 | 1,599 | 80,755,759 |
| Married couple, w/children | 26.7% | 27.1% | 30.5% |
| Married couple, no children | 40.1% | 33.3% | 42.9% |
| Non Family Households | 3,126 | 936 | 43,255,233 |
| Single householder, w/children | 25.7% | 27.6% | 15.8% |
| Single householder, no children | 7.5% | 12.0% | 10.8% |