| | Oakham, MA | Spencer, MA | United States |
| Population | 1,621 | 11,963 | 329,725,481 |
| Female Population | 50.7% | 46.6% | 50.5% |
| Male Population | 49.4% | 53.4% | 49.5% |
| Median Age | 49.8 | 47.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,906 | 11,715 | 309,327,143 |
| Population - 2000 | 1,673 | 11,691 | 285,036,114 |
| Population - 1990 | 1,503 | 11,645 | 251,960,433 |
| Pop. 2000 to Now | 16.6% | 1.8% | 15.6% |
| Pop. 1990 to Now | 29.7% | 2.2% | 30.8% |
| space4 | | | |
| Population Density | 77.9 | 364.4 | 93.4 |
| Land Area | 20.8 | 32.8 | 3,531,905.4 |
| Water Area | 0.4 | 1.2 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Oakham, MA | Spencer, MA | United States |
| Age 0 to 4 | 3.0% | 3.7% | 5.9% |
| Age 5 to 9 | 3.8% | 5.6% | 6.1% |
| Age 10 to 14 | 4.1% | 5.9% | 6.6% |
| Age 15 to 17 | 6.1% | 2.4% | 3.9% |
| Age 18 to 20 | 3.1% | 3.5% | 4.0% |
| Age 21 to 24 | 4.1% | 2.8% | 5.2% |
| Age 25 to 34 | 10.2% | 7.4% | 13.8% |
| Age 35 to 44 | 9.6% | 14.1% | 12.9% |
| Age 45 to 54 | 14.3% | 11.8% | 12.6% |
| Age 55 to 59 | 13.2% | 7.2% | 6.7% |
| Age 60 to 64 | 10.9% | 11.9% | 6.3% |
| Age 65 to 74 | 13.4% | 15.5% | 9.6% |
| Age 75 to 84 | 3.0% | 6.1% | 4.5% |
| Age 85 and over | 1.2% | 2.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Oakham, MA | Spencer, MA | United States |
| White | 94.4% | 91.1% | 59.4% |
| Black | 1.2% | 1.4% | 12.2% |
| Asian | 0.0% | 0.7% | 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 | 3.0% | 3.3% | 3.2% |
| Hispanic | 1.3% | 3.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Oakham, MA | Spencer, MA | United States |
| Married Population | 58.4% | 55.2% | 49.8% |
| Currently Married | 57.8% | 54.8% | 48.0% |
| Married but Separated | 0.6% | 0.4% | 1.8% |
| Single Population | 41.6% | 44.8% | 50.2% |
| Never Married | 27.7% | 27.1% | 33.8% |
| Divorced | 10.2% | 13.8% | 10.8% |
| Widowed | 3.7% | 4.0% | 5.6% |
| space5 | | | |
| Household Size | 2.58 | 2.29 | 2.60 |
| Households | 625 | 5,186 | 124,010,992 |
| Family Households | 478 | 3,288 | 80,755,759 |
| Married couple, w/children | 24.9% | 25.3% | 30.5% |
| Married couple, no children | 59.6% | 55.7% | 42.9% |
| Non Family Households | 147 | 1,898 | 43,255,233 |
| Single householder, w/children | 4.8% | 12.2% | 15.8% |
| Single householder, no children | 10.7% | 6.8% | 10.8% |