| | Shepherdsville, KY | Madison, AL | United States |
| Population | 13,918 | 55,551 | 329,725,481 |
| Female Population | 52.3% | 50.4% | 50.5% |
| Male Population | 47.7% | 49.6% | 49.5% |
| Median Age | 35.5 | 38.8 | 38.4 |
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| Population - 2010 | 11,172 | 43,558 | 309,327,143 |
| Population - 2000 | 8,334 | 29,329 | 285,036,114 |
| Population - 1990 | 4,805 | 14,904 | 251,960,433 |
| Pop. 2000 to Now | 47.6% | 79.5% | 15.6% |
| Pop. 1990 to Now | 155.9% | 253.3% | 30.8% |
| space4 | | | |
| Population Density | 959.1 | 1,832.4 | 93.4 |
| Land Area | 14.5 | 30.3 | 3,531,905.4 |
| Water Area | 0.3 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Shepherdsville, KY | Madison, AL | United States |
| Age 0 to 4 | 7.5% | 5.8% | 5.9% |
| Age 5 to 9 | 8.1% | 7.7% | 6.1% |
| Age 10 to 14 | 5.8% | 8.9% | 6.6% |
| Age 15 to 17 | 3.2% | 6.0% | 3.9% |
| Age 18 to 20 | 3.7% | 2.3% | 4.0% |
| Age 21 to 24 | 6.2% | 2.3% | 5.2% |
| Age 25 to 34 | 14.6% | 11.8% | 13.8% |
| Age 35 to 44 | 13.9% | 15.4% | 12.9% |
| Age 45 to 54 | 13.5% | 14.9% | 12.6% |
| Age 55 to 59 | 6.5% | 6.7% | 6.7% |
| Age 60 to 64 | 7.2% | 6.7% | 6.3% |
| Age 65 to 74 | 7.4% | 6.7% | 9.6% |
| Age 75 to 84 | 1.8% | 3.8% | 4.5% |
| Age 85 and over | 0.5% | 1.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Shepherdsville, KY | Madison, AL | United States |
| White | 90.5% | 69.2% | 59.4% |
| Black | 2.1% | 13.8% | 12.2% |
| Asian | 1.2% | 6.6% | 5.6% |
| Native American | 0.0% | 0.4% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.2% | 0.5% | 0.4% |
| Two or More Races | 3.2% | 2.8% | 3.2% |
| Hispanic | 2.7% | 6.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Shepherdsville, KY | Madison, AL | United States |
| Married Population | 53.4% | 62.2% | 49.8% |
| Currently Married | 51.9% | 61.4% | 48.0% |
| Married but Separated | 1.5% | 0.9% | 1.8% |
| Single Population | 46.6% | 37.8% | 50.2% |
| Never Married | 28.2% | 24.8% | 33.8% |
| Divorced | 12.8% | 8.0% | 10.8% |
| Widowed | 5.6% | 4.9% | 5.6% |
| space5 | | | |
| Household Size | 2.56 | 2.59 | 2.60 |
| Households | 5,344 | 21,357 | 124,010,992 |
| Family Households | 3,627 | 15,241 | 80,755,759 |
| Married couple, w/children | 30.2% | 44.7% | 30.5% |
| Married couple, no children | 40.7% | 39.5% | 42.9% |
| Non Family Households | 1,717 | 6,116 | 43,255,233 |
| Single householder, w/children | 22.7% | 12.6% | 15.8% |
| Single householder, no children | 6.5% | 3.2% | 10.8% |