| | Ayer, MA | West Boylston, MA | United States |
| Population | 8,396 | 7,874 | 329,725,481 |
| Female Population | 50.7% | 47.1% | 50.5% |
| Male Population | 49.3% | 52.9% | 49.5% |
| Median Age | 41 | 46.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 7,465 | 7,729 | 309,327,143 |
| Population - 2000 | 7,287 | 7,481 | 285,036,114 |
| Population - 1990 | 6,871 | 6,611 | 251,960,433 |
| Pop. 2000 to Now | 12.7% | 7.5% | 15.6% |
| Pop. 1990 to Now | 19.5% | 21.6% | 30.8% |
| space4 | | | |
| Population Density | 941.6 | 608.2 | 93.4 |
| Land Area | 8.9 | 12.9 | 3,531,905.4 |
| Water Area | 0.6 | 0.9 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Ayer, MA | West Boylston, MA | United States |
| Age 0 to 4 | 6.1% | 3.6% | 5.9% |
| Age 5 to 9 | 5.7% | 4.4% | 6.1% |
| Age 10 to 14 | 3.9% | 5.3% | 6.6% |
| Age 15 to 17 | 4.6% | 2.5% | 3.9% |
| Age 18 to 20 | 2.5% | 2.8% | 4.0% |
| Age 21 to 24 | 6.0% | 3.2% | 5.2% |
| Age 25 to 34 | 12.1% | 14.2% | 13.8% |
| Age 35 to 44 | 15.0% | 12.3% | 12.9% |
| Age 45 to 54 | 10.2% | 12.0% | 12.6% |
| Age 55 to 59 | 10.1% | 8.2% | 6.7% |
| Age 60 to 64 | 9.1% | 8.5% | 6.3% |
| Age 65 to 74 | 9.1% | 12.0% | 9.6% |
| Age 75 to 84 | 3.6% | 7.3% | 4.5% |
| Age 85 and over | 2.0% | 3.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Ayer, MA | West Boylston, MA | United States |
| White | 78.6% | 84.6% | 59.4% |
| Black | 2.5% | 3.7% | 12.2% |
| Asian | 4.9% | 1.1% | 5.6% |
| Native American | 0.1% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 1.6% | 0.4% |
| Two or More Races | 4.1% | 1.8% | 3.2% |
| Hispanic | 9.9% | 7.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Ayer, MA | West Boylston, MA | United States |
| Married Population | 48.2% | 50.5% | 49.8% |
| Currently Married | 46.7% | 47.9% | 48.0% |
| Married but Separated | 1.5% | 2.5% | 1.8% |
| Single Population | 51.8% | 49.5% | 50.2% |
| Never Married | 38.8% | 33.1% | 33.8% |
| Divorced | 9.4% | 10.1% | 10.8% |
| Widowed | 3.6% | 6.4% | 5.6% |
| space5 | | | |
| Household Size | 2.25 | 2.34 | 2.60 |
| Households | 3,694 | 2,825 | 124,010,992 |
| Family Households | 2,071 | 1,871 | 80,755,759 |
| Married couple, w/children | 33.2% | 24.8% | 30.5% |
| Married couple, no children | 41.9% | 56.4% | 42.9% |
| Non Family Households | 1,623 | 954 | 43,255,233 |
| Single householder, w/children | 16.3% | 10.2% | 15.8% |
| Single householder, no children | 8.6% | 8.6% | 10.8% |