| | Diamond, MO | Stuttgart, AR | United States |
| Population | 1,008 | 8,363 | 329,725,481 |
| Female Population | 49.8% | 50.5% | 50.5% |
| Male Population | 50.2% | 49.6% | 49.5% |
| Median Age | 33.5 | 38.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 888 | 9,333 | 309,327,143 |
| Population - 2000 | 807 | 9,745 | 285,036,114 |
| Population - 1990 | 775 | 10,420 | 251,960,433 |
| Pop. 2000 to Now | 12.6% | -13.8% | 15.6% |
| Pop. 1990 to Now | 17.3% | -19.4% | 30.8% |
| space4 | | | |
| Population Density | 1,349.4 | 1,171.6 | 93.4 |
| Land Area | 0.7 | 7.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Diamond, MO | Stuttgart, AR | United States |
| Age 0 to 4 | 5.7% | 7.4% | 5.9% |
| Age 5 to 9 | 4.9% | 7.4% | 6.1% |
| Age 10 to 14 | 10.8% | 6.1% | 6.6% |
| Age 15 to 17 | 4.2% | 2.6% | 3.9% |
| Age 18 to 20 | 3.9% | 4.0% | 4.0% |
| Age 21 to 24 | 2.8% | 4.1% | 5.2% |
| Age 25 to 34 | 22.3% | 13.5% | 13.8% |
| Age 35 to 44 | 14.4% | 11.5% | 12.9% |
| Age 45 to 54 | 12.3% | 13.9% | 12.6% |
| Age 55 to 59 | 4.0% | 6.3% | 6.7% |
| Age 60 to 64 | 2.4% | 5.4% | 6.3% |
| Age 65 to 74 | 5.6% | 11.1% | 9.6% |
| Age 75 to 84 | 6.3% | 5.2% | 4.5% |
| Age 85 and over | 0.7% | 1.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Diamond, MO | Stuttgart, AR | United States |
| White | 90.3% | 56.4% | 59.4% |
| Black | 0.0% | 39.7% | 12.2% |
| Asian | 0.0% | 0.1% | 5.6% |
| Native American | 2.3% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.4% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.6% | 1.7% | 3.2% |
| Hispanic | 5.5% | 1.7% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Diamond, MO | Stuttgart, AR | United States |
| Married Population | 54.6% | 44.9% | 49.8% |
| Currently Married | 53.8% | 43.1% | 48.0% |
| Married but Separated | 0.8% | 1.8% | 1.8% |
| Single Population | 45.4% | 55.1% | 50.2% |
| Never Married | 27.4% | 33.1% | 33.8% |
| Divorced | 13.1% | 13.9% | 10.8% |
| Widowed | 4.9% | 8.1% | 5.6% |
| space5 | | | |
| Household Size | 2.72 | 2.67 | 2.60 |
| Households | 371 | 3,097 | 124,010,992 |
| Family Households | 272 | 1,921 | 80,755,759 |
| Married couple, w/children | 46.3% | 23.5% | 30.5% |
| Married couple, no children | 34.2% | 48.6% | 42.9% |
| Non Family Households | 99 | 1,176 | 43,255,233 |
| Single householder, w/children | 11.0% | 17.4% | 15.8% |
| Single householder, no children | 8.5% | 10.5% | 10.8% |