| | Lancaster, KY | Cookeville, TN | United States |
| Population | 3,845 | 34,068 | 329,725,481 |
| Female Population | 56.4% | 51.1% | 50.5% |
| Male Population | 43.6% | 48.9% | 49.5% |
| Median Age | 36.2 | 30 | 38.4 |
| space3 | | | |
| Population - 2010 | 3,792 | 31,206 | 309,327,143 |
| Population - 2000 | 3,734 | 23,923 | 285,036,114 |
| Population - 1990 | 3,421 | 21,744 | 251,960,433 |
| Pop. 2000 to Now | 2.8% | 46.6% | 15.6% |
| Pop. 1990 to Now | 12.3% | 61.2% | 30.8% |
| space4 | | | |
| Population Density | 1,758.1 | 962.8 | 93.4 |
| Land Area | 2.2 | 35.4 | 3,531,905.4 |
| Water Area | 0.0 | 0.2 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Lancaster, KY | Cookeville, TN | United States |
| Age 0 to 4 | 7.0% | 5.8% | 5.9% |
| Age 5 to 9 | 7.2% | 5.0% | 6.1% |
| Age 10 to 14 | 7.8% | 6.0% | 6.6% |
| Age 15 to 17 | 3.8% | 3.2% | 3.9% |
| Age 18 to 20 | 4.2% | 10.5% | 4.0% |
| Age 21 to 24 | 2.5% | 11.9% | 5.2% |
| Age 25 to 34 | 16.3% | 13.6% | 13.8% |
| Age 35 to 44 | 11.1% | 11.1% | 12.9% |
| Age 45 to 54 | 13.7% | 10.7% | 12.6% |
| Age 55 to 59 | 5.2% | 3.5% | 6.7% |
| Age 60 to 64 | 4.7% | 5.0% | 6.3% |
| Age 65 to 74 | 5.7% | 7.7% | 9.6% |
| Age 75 to 84 | 7.5% | 4.6% | 4.5% |
| Age 85 and over | 3.3% | 1.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Lancaster, KY | Cookeville, TN | United States |
| White | 87.3% | 81.3% | 59.4% |
| Black | 9.2% | 4.1% | 12.2% |
| Asian | 0.0% | 1.8% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.2% | 0.1% | 0.4% |
| Two or More Races | 1.4% | 3.4% | 3.2% |
| Hispanic | 1.9% | 9.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Lancaster, KY | Cookeville, TN | United States |
| Married Population | 49.5% | 40.0% | 49.8% |
| Currently Married | 44.2% | 37.5% | 48.0% |
| Married but Separated | 5.4% | 2.5% | 1.8% |
| Single Population | 50.5% | 60.0% | 50.2% |
| Never Married | 29.4% | 42.8% | 33.8% |
| Divorced | 13.1% | 11.6% | 10.8% |
| Widowed | 8.0% | 5.6% | 5.6% |
| space5 | | | |
| Household Size | 2.54 | 2.23 | 2.60 |
| Households | 1,479 | 13,982 | 124,010,992 |
| Family Households | 1,059 | 7,405 | 80,755,759 |
| Married couple, w/children | 20.8% | 27.2% | 30.5% |
| Married couple, no children | 30.5% | 40.5% | 42.9% |
| Non Family Households | 420 | 6,577 | 43,255,233 |
| Single householder, w/children | 34.4% | 20.4% | 15.8% |
| Single householder, no children | 14.4% | 12.0% | 10.8% |