| | Medfield, MA | Medway, MA | United States |
| Population | 12,775 | 13,105 | 329,725,481 |
| Female Population | 51.0% | 53.1% | 50.5% |
| Male Population | 49.0% | 46.9% | 49.5% |
| Median Age | 40.8 | 39.6 | 38.4 |
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| Population - 2010 | 12,058 | 12,785 | 309,327,143 |
| Population - 2000 | 12,273 | 12,448 | 285,036,114 |
| Population - 1990 | 10,531 | 9,931 | 251,960,433 |
| Pop. 2000 to Now | 6.0% | 8.0% | 15.6% |
| Pop. 1990 to Now | 23.6% | 35.4% | 30.8% |
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| Population Density | 887.0 | 1,135.3 | 93.4 |
| Land Area | 14.4 | 11.5 | 3,531,905.4 |
| Water Area | 0.2 | 0.1 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Medfield, MA | Medway, MA | United States |
| Age 0 to 4 | 7.6% | 6.3% | 5.9% |
| Age 5 to 9 | 7.9% | 6.8% | 6.1% |
| Age 10 to 14 | 8.9% | 6.4% | 6.6% |
| Age 15 to 17 | 5.3% | 5.7% | 3.9% |
| Age 18 to 20 | 3.0% | 2.7% | 4.0% |
| Age 21 to 24 | 3.6% | 3.7% | 5.2% |
| Age 25 to 34 | 6.8% | 12.4% | 13.8% |
| Age 35 to 44 | 12.8% | 12.5% | 12.9% |
| Age 45 to 54 | 16.0% | 15.5% | 12.6% |
| Age 55 to 59 | 9.6% | 8.5% | 6.7% |
| Age 60 to 64 | 6.5% | 6.8% | 6.3% |
| Age 65 to 74 | 7.1% | 7.6% | 9.6% |
| Age 75 to 84 | 4.3% | 3.5% | 4.5% |
| Age 85 and over | 0.8% | 1.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Medfield, MA | Medway, MA | United States |
| White | 92.5% | 89.5% | 59.4% |
| Black | 0.2% | 1.2% | 12.2% |
| Asian | 3.0% | 3.1% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.1% | 3.2% | 3.2% |
| Hispanic | 3.1% | 3.1% | 18.4% |
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| Marriage & Family | | | |
| | Medfield, MA | Medway, MA | United States |
| Married Population | 69.9% | 59.2% | 49.8% |
| Currently Married | 69.8% | 58.5% | 48.0% |
| Married but Separated | 0.2% | 0.7% | 1.8% |
| Single Population | 30.1% | 40.8% | 50.2% |
| Never Married | 22.3% | 29.4% | 33.8% |
| Divorced | 4.3% | 6.9% | 10.8% |
| Widowed | 3.5% | 4.4% | 5.6% |
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| Household Size | 2.91 | 2.77 | 2.60 |
| Households | 4,373 | 4,681 | 124,010,992 |
| Family Households | 3,591 | 3,492 | 80,755,759 |
| Married couple, w/children | 50.8% | 45.2% | 30.5% |
| Married couple, no children | 41.8% | 40.2% | 42.9% |
| Non Family Households | 782 | 1,189 | 43,255,233 |
| Single householder, w/children | 4.1% | 5.9% | 15.8% |
| Single householder, no children | 3.3% | 8.8% | 10.8% |