| | Greenland, AR | Johnson, AR | United States |
| Population | 1,516 | 3,612 | 329,725,481 |
| Female Population | 53.2% | 56.4% | 50.5% |
| Male Population | 46.8% | 43.6% | 49.5% |
| Median Age | 36.5 | 31.6 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,288 | 3,410 | 309,327,143 |
| Population - 2000 | 907 | 2,319 | 285,036,114 |
| Population - 1990 | 757 | 599 | 251,960,433 |
| Pop. 2000 to Now | 54.0% | 62.6% | 15.6% |
| Pop. 1990 to Now | 84.5% | 529.6% | 30.8% |
| space4 | | | |
| Population Density | 369.0 | 999.7 | 93.4 |
| Land Area | 4.1 | 3.6 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Greenland, AR | Johnson, AR | United States |
| Age 0 to 4 | 3.8% | 14.3% | 5.9% |
| Age 5 to 9 | 6.7% | 8.2% | 6.1% |
| Age 10 to 14 | 7.3% | 4.8% | 6.6% |
| Age 15 to 17 | 2.9% | 3.2% | 3.9% |
| Age 18 to 20 | 5.3% | 2.0% | 4.0% |
| Age 21 to 24 | 6.7% | 2.9% | 5.2% |
| Age 25 to 34 | 14.8% | 22.5% | 13.8% |
| Age 35 to 44 | 15.3% | 18.5% | 12.9% |
| Age 45 to 54 | 10.4% | 5.6% | 12.6% |
| Age 55 to 59 | 7.3% | 3.5% | 6.7% |
| Age 60 to 64 | 3.8% | 3.3% | 6.3% |
| Age 65 to 74 | 8.3% | 6.1% | 9.6% |
| Age 75 to 84 | 5.8% | 2.6% | 4.5% |
| Age 85 and over | 1.6% | 2.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Greenland, AR | Johnson, AR | United States |
| White | 85.0% | 83.4% | 59.4% |
| Black | 3.2% | 3.6% | 12.2% |
| Asian | 0.6% | 6.8% | 5.6% |
| Native American | 1.9% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 7.8% | 3.0% | 3.2% |
| Hispanic | 1.6% | 3.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Greenland, AR | Johnson, AR | United States |
| Married Population | 51.2% | 55.9% | 49.8% |
| Currently Married | 47.3% | 55.3% | 48.0% |
| Married but Separated | 3.9% | 0.6% | 1.8% |
| Single Population | 48.8% | 44.1% | 50.2% |
| Never Married | 31.3% | 24.2% | 33.8% |
| Divorced | 15.2% | 15.6% | 10.8% |
| Widowed | 2.2% | 4.3% | 5.6% |
| space5 | | | |
| Household Size | 2.96 | 2.68 | 2.60 |
| Households | 513 | 1,348 | 124,010,992 |
| Family Households | 365 | 846 | 80,755,759 |
| Married couple, w/children | 26.8% | 42.1% | 30.5% |
| Married couple, no children | 40.3% | 34.9% | 42.9% |
| Non Family Households | 148 | 502 | 43,255,233 |
| Single householder, w/children | 17.5% | 11.7% | 15.8% |
| Single householder, no children | 15.3% | 11.3% | 10.8% |