| | Rome, IA | Milan, TN | United States |
| Population | 100 | 8,143 | 329,725,481 |
| Female Population | 48.0% | 53.2% | 50.5% |
| Male Population | 52.0% | 46.8% | 49.5% |
| Median Age | 37.6 | 35.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 116 | 7,865 | 309,327,143 |
| Population - 2000 | 113 | 7,664 | 285,036,114 |
| Population - 1990 | 124 | 7,512 | 251,960,433 |
| Pop. 2000 to Now | 3.5% | -0.7% | 15.6% |
| Pop. 1990 to Now | -5.7% | 1.3% | 30.8% |
| space4 | | | |
| Population Density | 806.5 | 911.9 | 93.4 |
| Land Area | 0.1 | 8.9 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Rome, IA | Milan, TN | United States |
| Age 0 to 4 | 3.0% | 5.4% | 5.9% |
| Age 5 to 9 | 9.0% | 8.8% | 6.1% |
| Age 10 to 14 | 7.0% | 11.1% | 6.6% |
| Age 15 to 17 | 8.0% | 6.7% | 3.9% |
| Age 18 to 20 | 0.0% | 1.5% | 4.0% |
| Age 21 to 24 | 0.0% | 3.3% | 5.2% |
| Age 25 to 34 | 19.0% | 12.1% | 13.8% |
| Age 35 to 44 | 16.0% | 14.0% | 12.9% |
| Age 45 to 54 | 19.0% | 8.6% | 12.6% |
| Age 55 to 59 | 6.0% | 5.6% | 6.7% |
| Age 60 to 64 | 6.0% | 8.4% | 6.3% |
| Age 65 to 74 | 6.0% | 7.9% | 9.6% |
| Age 75 to 84 | 1.0% | 4.5% | 4.5% |
| Age 85 and over | 0.0% | 2.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Rome, IA | Milan, TN | United States |
| White | 97.0% | 67.7% | 59.4% |
| Black | 0.0% | 25.0% | 12.2% |
| Asian | 0.0% | 0.2% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 3.0% | 5.6% | 3.2% |
| Hispanic | 0.0% | 1.3% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Rome, IA | Milan, TN | United States |
| Married Population | 53.1% | 46.1% | 49.8% |
| Currently Married | 45.7% | 43.4% | 48.0% |
| Married but Separated | 7.4% | 2.7% | 1.8% |
| Single Population | 46.9% | 53.9% | 50.2% |
| Never Married | 21.0% | 29.8% | 33.8% |
| Divorced | 25.9% | 18.0% | 10.8% |
| Widowed | 0.0% | 6.1% | 5.6% |
| space5 | | | |
| Household Size | 2.50 | 2.64 | 2.60 |
| Households | 40 | 3,007 | 124,010,992 |
| Family Households | 20 | 1,963 | 80,755,759 |
| Married couple, w/children | 55.0% | 28.8% | 30.5% |
| Married couple, no children | 35.0% | 35.4% | 42.9% |
| Non Family Households | 20 | 1,044 | 43,255,233 |
| Single householder, w/children | 10.0% | 27.0% | 15.8% |
| Single householder, no children | 0.0% | 8.8% | 10.8% |