| | Cohasset, MA | Scituate, MA | United States |
| Population | 8,295 | 19,016 | 329,725,481 |
| Female Population | 52.9% | 53.3% | 50.5% |
| Male Population | 47.1% | 46.8% | 49.5% |
| Median Age | 45.1 | 49.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 7,549 | 18,157 | 309,327,143 |
| Population - 2000 | 7,261 | 17,863 | 285,036,114 |
| Population - 1990 | 7,075 | 16,786 | 251,960,433 |
| Pop. 2000 to Now | 17.5% | 6.6% | 15.6% |
| Pop. 1990 to Now | 20.6% | 13.5% | 30.8% |
| space4 | | | |
| Population Density | 847.4 | 1,078.3 | 93.4 |
| Land Area | 9.8 | 17.6 | 3,531,905.4 |
| Water Area | 21.6 | 14.2 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Cohasset, MA | Scituate, MA | United States |
| Age 0 to 4 | 9.0% | 3.4% | 5.9% |
| Age 5 to 9 | 8.5% | 5.9% | 6.1% |
| Age 10 to 14 | 7.0% | 6.5% | 6.6% |
| Age 15 to 17 | 3.8% | 4.3% | 3.9% |
| Age 18 to 20 | 1.0% | 3.4% | 4.0% |
| Age 21 to 24 | 2.8% | 3.8% | 5.2% |
| Age 25 to 34 | 5.3% | 8.2% | 13.8% |
| Age 35 to 44 | 12.4% | 9.0% | 12.9% |
| Age 45 to 54 | 15.0% | 15.2% | 12.6% |
| Age 55 to 59 | 11.0% | 8.9% | 6.7% |
| Age 60 to 64 | 7.2% | 8.3% | 6.3% |
| Age 65 to 74 | 9.7% | 13.3% | 9.6% |
| Age 75 to 84 | 4.2% | 6.7% | 4.5% |
| Age 85 and over | 3.2% | 2.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Cohasset, MA | Scituate, MA | United States |
| White | 93.8% | 90.7% | 59.4% |
| Black | 1.0% | 0.3% | 12.2% |
| Asian | 0.4% | 1.9% | 5.6% |
| Native American | 0.4% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.4% | 0.0% | 0.2% |
| Other | 1.2% | 2.6% | 0.4% |
| Two or More Races | 1.7% | 3.0% | 3.2% |
| Hispanic | 1.2% | 1.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Cohasset, MA | Scituate, MA | United States |
| Married Population | 66.8% | 57.5% | 49.8% |
| Currently Married | 65.6% | 55.9% | 48.0% |
| Married but Separated | 1.2% | 1.6% | 1.8% |
| Single Population | 33.2% | 42.5% | 50.2% |
| Never Married | 19.7% | 26.0% | 33.8% |
| Divorced | 7.6% | 8.9% | 10.8% |
| Widowed | 5.9% | 7.6% | 5.6% |
| space5 | | | |
| Household Size | 2.61 | 2.50 | 2.60 |
| Households | 3,146 | 7,549 | 124,010,992 |
| Family Households | 2,230 | 5,307 | 80,755,759 |
| Married couple, w/children | 42.9% | 30.7% | 30.5% |
| Married couple, no children | 46.1% | 49.2% | 42.9% |
| Non Family Households | 916 | 2,242 | 43,255,233 |
| Single householder, w/children | 8.7% | 11.9% | 15.8% |
| Single householder, no children | 2.3% | 8.3% | 10.8% |