| | Hopkinton, RI | Foster, RI | United States |
| Population | 8,411 | 4,505 | 329,725,481 |
| Female Population | 53.5% | 53.6% | 50.5% |
| Male Population | 46.5% | 46.4% | 49.5% |
| Median Age | 45.6 | 41.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 8,180 | 4,613 | 309,327,143 |
| Population - 2000 | 7,836 | 4,274 | 285,036,114 |
| Population - 1990 | 6,873 | 4,316 | 251,960,433 |
| Pop. 2000 to Now | 3.3% | 11.1% | 15.6% |
| Pop. 1990 to Now | 17.8% | 10.0% | 30.8% |
| space4 | | | |
| Population Density | 195.8 | 88.7 | 93.4 |
| Land Area | 43.0 | 50.8 | 3,531,905.4 |
| Water Area | 1.3 | 1.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Hopkinton, RI | Foster, RI | United States |
| Age 0 to 4 | 3.2% | 5.0% | 5.9% |
| Age 5 to 9 | 6.6% | 4.5% | 6.1% |
| Age 10 to 14 | 5.7% | 5.1% | 6.6% |
| Age 15 to 17 | 2.1% | 5.7% | 3.9% |
| Age 18 to 20 | 5.2% | 4.2% | 4.0% |
| Age 21 to 24 | 7.2% | 4.5% | 5.2% |
| Age 25 to 34 | 6.2% | 12.3% | 13.8% |
| Age 35 to 44 | 13.6% | 11.4% | 12.9% |
| Age 45 to 54 | 15.4% | 16.4% | 12.6% |
| Age 55 to 59 | 8.3% | 6.9% | 6.7% |
| Age 60 to 64 | 9.2% | 7.3% | 6.3% |
| Age 65 to 74 | 10.5% | 10.2% | 9.6% |
| Age 75 to 84 | 4.8% | 5.5% | 4.5% |
| Age 85 and over | 2.1% | 1.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Hopkinton, RI | Foster, RI | United States |
| White | 94.7% | 87.2% | 59.4% |
| Black | 0.6% | 0.2% | 12.2% |
| Asian | 1.1% | 0.4% | 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 | 1.8% | 10.9% | 3.2% |
| Hispanic | 1.8% | 1.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Hopkinton, RI | Foster, RI | United States |
| Married Population | 59.1% | 51.6% | 49.8% |
| Currently Married | 57.8% | 51.6% | 48.0% |
| Married but Separated | 1.3% | 0.0% | 1.8% |
| Single Population | 40.9% | 48.4% | 50.2% |
| Never Married | 28.0% | 29.3% | 33.8% |
| Divorced | 10.2% | 12.8% | 10.8% |
| Widowed | 2.6% | 6.4% | 5.6% |
| space5 | | | |
| Household Size | 2.61 | 3.14 | 2.60 |
| Households | 3,223 | 1,431 | 124,010,992 |
| Family Households | 2,464 | 1,090 | 80,755,759 |
| Married couple, w/children | 24.8% | 32.7% | 30.5% |
| Married couple, no children | 55.8% | 47.0% | 42.9% |
| Non Family Households | 759 | 341 | 43,255,233 |
| Single householder, w/children | 15.2% | 11.4% | 15.8% |
| Single householder, no children | 4.3% | 9.0% | 10.8% |