| | Potosi, MO | Greenbrier, AR | United States |
| Population | 2,563 | 5,683 | 329,725,481 |
| Female Population | 53.0% | 50.8% | 50.5% |
| Male Population | 47.0% | 49.2% | 49.5% |
| Median Age | 38.9 | 31.8 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,646 | 4,729 | 309,327,143 |
| Population - 2000 | 2,662 | 3,042 | 285,036,114 |
| Population - 1990 | 2,683 | 2,130 | 251,960,433 |
| Pop. 2000 to Now | -4.3% | 90.1% | 15.6% |
| Pop. 1990 to Now | -5.0% | 171.5% | 30.8% |
| space4 | | | |
| Population Density | 1,101.0 | 715.7 | 93.4 |
| Land Area | 2.3 | 7.9 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Potosi, MO | Greenbrier, AR | United States |
| Age 0 to 4 | 8.7% | 10.5% | 5.9% |
| Age 5 to 9 | 4.4% | 9.3% | 6.1% |
| Age 10 to 14 | 6.2% | 7.7% | 6.6% |
| Age 15 to 17 | 5.9% | 2.7% | 3.9% |
| Age 18 to 20 | 5.5% | 1.8% | 4.0% |
| Age 21 to 24 | 2.7% | 3.6% | 5.2% |
| Age 25 to 34 | 12.2% | 22.6% | 13.8% |
| Age 35 to 44 | 12.9% | 8.3% | 12.9% |
| Age 45 to 54 | 9.5% | 10.8% | 12.6% |
| Age 55 to 59 | 8.7% | 4.4% | 6.7% |
| Age 60 to 64 | 5.7% | 2.6% | 6.3% |
| Age 65 to 74 | 8.5% | 9.8% | 9.6% |
| Age 75 to 84 | 6.3% | 4.0% | 4.5% |
| Age 85 and over | 3.0% | 2.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Potosi, MO | Greenbrier, AR | United States |
| White | 93.2% | 88.3% | 59.4% |
| Black | 1.2% | 0.2% | 12.2% |
| Asian | 0.2% | 0.0% | 5.6% |
| Native American | 0.2% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.6% | 0.0% | 0.4% |
| Two or More Races | 3.4% | 3.1% | 3.2% |
| Hispanic | 1.1% | 8.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Potosi, MO | Greenbrier, AR | United States |
| Married Population | 42.5% | 59.4% | 49.8% |
| Currently Married | 39.8% | 57.9% | 48.0% |
| Married but Separated | 2.7% | 1.5% | 1.8% |
| Single Population | 57.5% | 40.6% | 50.2% |
| Never Married | 29.1% | 18.9% | 33.8% |
| Divorced | 15.9% | 15.4% | 10.8% |
| Widowed | 12.6% | 6.2% | 5.6% |
| space5 | | | |
| Household Size | 2.34 | 2.61 | 2.60 |
| Households | 1,033 | 2,175 | 124,010,992 |
| Family Households | 569 | 1,569 | 80,755,759 |
| Married couple, w/children | 35.9% | 43.1% | 30.5% |
| Married couple, no children | 30.9% | 28.6% | 42.9% |
| Non Family Households | 464 | 606 | 43,255,233 |
| Single householder, w/children | 23.7% | 19.9% | 15.8% |
| Single householder, no children | 9.5% | 8.3% | 10.8% |