| | Greenwood, MO | Grain Valley, MO | United States |
| Population | 6,008 | 15,435 | 329,725,481 |
| Female Population | 50.1% | 50.6% | 50.5% |
| Male Population | 49.9% | 49.4% | 49.5% |
| Median Age | 38.1 | 35.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 5,227 | 12,876 | 309,327,143 |
| Population - 2000 | 3,952 | 5,160 | 285,036,114 |
| Population - 1990 | 1,505 | 1,898 | 251,960,433 |
| Pop. 2000 to Now | 48.8% | 187.3% | 15.6% |
| Pop. 1990 to Now | 290.8% | 681.2% | 30.8% |
| space4 | | | |
| Population Density | 1,147.9 | 2,540.7 | 93.4 |
| Land Area | 5.2 | 6.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Greenwood, MO | Grain Valley, MO | United States |
| Age 0 to 4 | 6.0% | 6.2% | 5.9% |
| Age 5 to 9 | 4.8% | 7.1% | 6.1% |
| Age 10 to 14 | 7.0% | 11.7% | 6.6% |
| Age 15 to 17 | 4.7% | 5.6% | 3.9% |
| Age 18 to 20 | 3.0% | 2.8% | 4.0% |
| Age 21 to 24 | 3.5% | 4.7% | 5.2% |
| Age 25 to 34 | 13.4% | 11.7% | 13.8% |
| Age 35 to 44 | 16.9% | 17.8% | 12.9% |
| Age 45 to 54 | 19.7% | 13.6% | 12.6% |
| Age 55 to 59 | 6.2% | 4.7% | 6.7% |
| Age 60 to 64 | 2.0% | 3.7% | 6.3% |
| Age 65 to 74 | 9.5% | 6.5% | 9.6% |
| Age 75 to 84 | 2.8% | 3.4% | 4.5% |
| Age 85 and over | 0.5% | 0.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Greenwood, MO | Grain Valley, MO | United States |
| White | 89.2% | 88.0% | 59.4% |
| Black | 3.5% | 3.1% | 12.2% |
| Asian | 0.3% | 0.4% | 5.6% |
| Native American | 0.2% | 0.5% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 2.0% | 0.0% | 0.4% |
| Two or More Races | 3.6% | 4.4% | 3.2% |
| Hispanic | 1.2% | 3.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Greenwood, MO | Grain Valley, MO | United States |
| Married Population | 61.9% | 53.9% | 49.8% |
| Currently Married | 61.2% | 52.4% | 48.0% |
| Married but Separated | 0.7% | 1.5% | 1.8% |
| Single Population | 38.1% | 46.1% | 50.2% |
| Never Married | 27.8% | 26.4% | 33.8% |
| Divorced | 8.9% | 14.9% | 10.8% |
| Widowed | 1.4% | 4.8% | 5.6% |
| space5 | | | |
| Household Size | 2.71 | 2.70 | 2.60 |
| Households | 2,216 | 5,712 | 124,010,992 |
| Family Households | 1,957 | 4,077 | 80,755,759 |
| Married couple, w/children | 26.0% | 40.1% | 30.5% |
| Married couple, no children | 50.3% | 33.4% | 42.9% |
| Non Family Households | 259 | 1,635 | 43,255,233 |
| Single householder, w/children | 12.2% | 15.8% | 15.8% |
| Single householder, no children | 11.5% | 10.7% | 10.8% |