| | Readfield, ME | Greene, ME | United States |
| Population | 2,587 | 4,403 | 329,725,481 |
| Female Population | 44.1% | 48.0% | 50.5% |
| Male Population | 55.9% | 52.0% | 49.5% |
| Median Age | 45.5 | 40.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,591 | 4,349 | 309,327,143 |
| Population - 2000 | 2,360 | 4,076 | 285,036,114 |
| Population - 1990 | 2,033 | 3,661 | 251,960,433 |
| Pop. 2000 to Now | 9.6% | 6.7% | 15.6% |
| Pop. 1990 to Now | 27.2% | 18.7% | 30.8% |
| space4 | | | |
| Population Density | 88.7 | 136.4 | 93.4 |
| Land Area | 29.2 | 32.3 | 3,531,905.4 |
| Water Area | 1.8 | 2.9 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Readfield, ME | Greene, ME | United States |
| Age 0 to 4 | 3.1% | 7.7% | 5.9% |
| Age 5 to 9 | 3.8% | 6.7% | 6.1% |
| Age 10 to 14 | 6.5% | 4.1% | 6.6% |
| Age 15 to 17 | 5.6% | 3.9% | 3.9% |
| Age 18 to 20 | 3.8% | 2.8% | 4.0% |
| Age 21 to 24 | 3.2% | 4.0% | 5.2% |
| Age 25 to 34 | 12.4% | 13.3% | 13.8% |
| Age 35 to 44 | 10.9% | 13.8% | 12.9% |
| Age 45 to 54 | 20.1% | 15.9% | 12.6% |
| Age 55 to 59 | 6.4% | 5.8% | 6.7% |
| Age 60 to 64 | 8.2% | 5.7% | 6.3% |
| Age 65 to 74 | 10.6% | 9.3% | 9.6% |
| Age 75 to 84 | 3.8% | 6.0% | 4.5% |
| Age 85 and over | 1.8% | 1.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Readfield, ME | Greene, ME | United States |
| White | 96.4% | 95.2% | 59.4% |
| Black | 0.2% | 0.2% | 12.2% |
| Asian | 0.0% | 0.3% | 5.6% |
| Native American | 1.9% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.1% | 1.7% | 3.2% |
| Hispanic | 1.4% | 2.7% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Readfield, ME | Greene, ME | United States |
| Married Population | 52.9% | 65.3% | 49.8% |
| Currently Married | 52.3% | 65.3% | 48.0% |
| Married but Separated | 0.6% | 0.0% | 1.8% |
| Single Population | 47.1% | 34.7% | 50.2% |
| Never Married | 29.5% | 19.5% | 33.8% |
| Divorced | 13.1% | 11.6% | 10.8% |
| Widowed | 4.5% | 3.7% | 5.6% |
| space5 | | | |
| Household Size | 2.65 | 2.65 | 2.60 |
| Households | 959 | 1,661 | 124,010,992 |
| Family Households | 696 | 1,243 | 80,755,759 |
| Married couple, w/children | 33.2% | 35.0% | 30.5% |
| Married couple, no children | 48.3% | 54.6% | 42.9% |
| Non Family Households | 263 | 418 | 43,255,233 |
| Single householder, w/children | 9.6% | 6.6% | 15.8% |
| Single householder, no children | 8.9% | 3.8% | 10.8% |