| | Rockford, MI | Cookeville, TN | United States |
| Population | 6,131 | 34,068 | 329,725,481 |
| Female Population | 49.9% | 51.1% | 50.5% |
| Male Population | 50.1% | 48.9% | 49.5% |
| Median Age | 36.5 | 30 | 38.4 |
| space3 | | | |
| Population - 2010 | 5,711 | 31,206 | 309,327,143 |
| Population - 2000 | 4,626 | 23,923 | 285,036,114 |
| Population - 1990 | 3,750 | 21,744 | 251,960,433 |
| Pop. 2000 to Now | 38.2% | 46.6% | 15.6% |
| Pop. 1990 to Now | 70.5% | 61.2% | 30.8% |
| space4 | | | |
| Population Density | 1,901.7 | 962.8 | 93.4 |
| Land Area | 3.2 | 35.4 | 3,531,905.4 |
| Water Area | 0.1 | 0.2 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Rockford, MI | Cookeville, TN | United States |
| Age 0 to 4 | 6.3% | 5.8% | 5.9% |
| Age 5 to 9 | 7.7% | 5.0% | 6.1% |
| Age 10 to 14 | 6.9% | 6.0% | 6.6% |
| Age 15 to 17 | 3.3% | 3.2% | 3.9% |
| Age 18 to 20 | 2.6% | 10.5% | 4.0% |
| Age 21 to 24 | 4.1% | 11.9% | 5.2% |
| Age 25 to 34 | 15.3% | 13.6% | 13.8% |
| Age 35 to 44 | 13.6% | 11.1% | 12.9% |
| Age 45 to 54 | 14.0% | 10.7% | 12.6% |
| Age 55 to 59 | 4.6% | 3.5% | 6.7% |
| Age 60 to 64 | 10.7% | 5.0% | 6.3% |
| Age 65 to 74 | 8.4% | 7.7% | 9.6% |
| Age 75 to 84 | 2.7% | 4.6% | 4.5% |
| Age 85 and over | 0.0% | 1.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Rockford, MI | Cookeville, TN | United States |
| White | 91.6% | 81.3% | 59.4% |
| Black | 2.4% | 4.1% | 12.2% |
| Asian | 0.3% | 1.8% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 2.6% | 3.4% | 3.2% |
| Hispanic | 3.2% | 9.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Rockford, MI | Cookeville, TN | United States |
| Married Population | 57.4% | 40.0% | 49.8% |
| Currently Married | 55.4% | 37.5% | 48.0% |
| Married but Separated | 2.1% | 2.5% | 1.8% |
| Single Population | 42.6% | 60.0% | 50.2% |
| Never Married | 25.4% | 42.8% | 33.8% |
| Divorced | 15.1% | 11.6% | 10.8% |
| Widowed | 2.1% | 5.6% | 5.6% |
| space5 | | | |
| Household Size | 2.40 | 2.23 | 2.60 |
| Households | 2,542 | 13,982 | 124,010,992 |
| Family Households | 1,664 | 7,405 | 80,755,759 |
| Married couple, w/children | 35.3% | 27.2% | 30.5% |
| Married couple, no children | 45.4% | 40.5% | 42.9% |
| Non Family Households | 878 | 6,577 | 43,255,233 |
| Single householder, w/children | 13.7% | 20.4% | 15.8% |
| Single householder, no children | 5.6% | 12.0% | 10.8% |