| | Alliance, OH | Greenville, RI | United States |
| Population | 21,864 | 8,955 | 329,725,481 |
| Female Population | 50.4% | 52.8% | 50.5% |
| Male Population | 49.6% | 47.3% | 49.5% |
| Median Age | 35.9 | 51.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 22,280 | 8,767 | 309,327,143 |
| Population - 2000 | 23,253 | 8,626 | 285,036,114 |
| Population - 1990 | 23,376 | 8,303 | 251,960,433 |
| Pop. 2000 to Now | -7.9% | -2.4% | 15.6% |
| Pop. 1990 to Now | -8.4% | 1.4% | 30.8% |
| space4 | | | |
| Population Density | 2,428.3 | 1,755.9 | 93.4 |
| Land Area | 9.0 | 5.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.6 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Alliance, OH | Greenville, RI | United States |
| Age 0 to 4 | 6.1% | 2.8% | 5.9% |
| Age 5 to 9 | 7.3% | 3.6% | 6.1% |
| Age 10 to 14 | 6.2% | 5.1% | 6.6% |
| Age 15 to 17 | 2.7% | 4.2% | 3.9% |
| Age 18 to 20 | 8.5% | 4.0% | 4.0% |
| Age 21 to 24 | 6.1% | 3.7% | 5.2% |
| Age 25 to 34 | 11.2% | 10.3% | 13.8% |
| Age 35 to 44 | 10.1% | 8.5% | 12.9% |
| Age 45 to 54 | 11.2% | 12.4% | 12.6% |
| Age 55 to 59 | 7.5% | 7.1% | 6.7% |
| Age 60 to 64 | 6.2% | 7.6% | 6.3% |
| Age 65 to 74 | 10.4% | 11.7% | 9.6% |
| Age 75 to 84 | 4.0% | 13.4% | 4.5% |
| Age 85 and over | 2.3% | 5.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Alliance, OH | Greenville, RI | United States |
| White | 85.1% | 92.1% | 59.4% |
| Black | 7.9% | 0.8% | 12.2% |
| Asian | 0.2% | 1.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.6% | 0.1% | 0.4% |
| Two or More Races | 5.2% | 1.6% | 3.2% |
| Hispanic | 0.9% | 4.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Alliance, OH | Greenville, RI | United States |
| Married Population | 37.5% | 51.8% | 49.8% |
| Currently Married | 35.0% | 51.6% | 48.0% |
| Married but Separated | 2.5% | 0.2% | 1.8% |
| Single Population | 62.5% | 48.2% | 50.2% |
| Never Married | 39.8% | 28.2% | 33.8% |
| Divorced | 15.4% | 8.3% | 10.8% |
| Widowed | 7.3% | 11.7% | 5.6% |
| space5 | | | |
| Household Size | 2.39 | 2.32 | 2.60 |
| Households | 8,424 | 3,634 | 124,010,992 |
| Family Households | 4,793 | 2,295 | 80,755,759 |
| Married couple, w/children | 21.3% | 28.2% | 30.5% |
| Married couple, no children | 40.4% | 58.2% | 42.9% |
| Non Family Households | 3,631 | 1,339 | 43,255,233 |
| Single householder, w/children | 24.2% | 7.5% | 15.8% |
| Single householder, no children | 14.1% | 6.0% | 10.8% |