| | Grottoes, VA | Poquoson, VA | United States |
| Population | 2,886 | 12,382 | 329,725,481 |
| Female Population | 56.2% | 49.9% | 50.5% |
| Male Population | 43.8% | 50.2% | 49.5% |
| Median Age | 39 | 43 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,666 | 12,148 | 309,327,143 |
| Population - 2000 | 2,114 | 11,566 | 285,036,114 |
| Population - 1990 | 1,455 | 11,005 | 251,960,433 |
| Pop. 2000 to Now | 35.5% | 6.0% | 15.6% |
| Pop. 1990 to Now | 96.8% | 11.4% | 30.8% |
| space4 | | | |
| Population Density | 1,411.9 | 805.0 | 93.4 |
| Land Area | 2.0 | 15.4 | 3,531,905.4 |
| Water Area | 0.0 | 63.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Grottoes, VA | Poquoson, VA | United States |
| Age 0 to 4 | 6.0% | 4.5% | 5.9% |
| Age 5 to 9 | 3.8% | 5.4% | 6.1% |
| Age 10 to 14 | 6.4% | 7.3% | 6.6% |
| Age 15 to 17 | 5.5% | 4.6% | 3.9% |
| Age 18 to 20 | 1.4% | 2.6% | 4.0% |
| Age 21 to 24 | 5.9% | 5.0% | 5.2% |
| Age 25 to 34 | 14.8% | 9.9% | 13.8% |
| Age 35 to 44 | 11.9% | 13.2% | 12.9% |
| Age 45 to 54 | 14.8% | 13.9% | 12.6% |
| Age 55 to 59 | 8.6% | 7.0% | 6.7% |
| Age 60 to 64 | 5.8% | 7.2% | 6.3% |
| Age 65 to 74 | 8.4% | 10.7% | 9.6% |
| Age 75 to 84 | 5.7% | 6.6% | 4.5% |
| Age 85 and over | 1.0% | 2.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Grottoes, VA | Poquoson, VA | United States |
| White | 88.7% | 90.4% | 59.4% |
| Black | 2.7% | 1.5% | 12.2% |
| Asian | 0.1% | 1.8% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.8% | 0.0% | 0.4% |
| Two or More Races | 2.8% | 3.1% | 3.2% |
| Hispanic | 4.9% | 3.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Grottoes, VA | Poquoson, VA | United States |
| Married Population | 52.0% | 68.7% | 49.8% |
| Currently Married | 50.3% | 66.8% | 48.0% |
| Married but Separated | 1.7% | 2.0% | 1.8% |
| Single Population | 48.0% | 31.3% | 50.2% |
| Never Married | 27.6% | 19.0% | 33.8% |
| Divorced | 17.3% | 7.5% | 10.8% |
| Widowed | 3.1% | 4.8% | 5.6% |
| space5 | | | |
| Household Size | 2.50 | 2.67 | 2.60 |
| Households | 1,156 | 4,617 | 124,010,992 |
| Family Households | 758 | 3,759 | 80,755,759 |
| Married couple, w/children | 30.6% | 39.6% | 30.5% |
| Married couple, no children | 49.2% | 48.4% | 42.9% |
| Non Family Households | 398 | 858 | 43,255,233 |
| Single householder, w/children | 18.7% | 6.5% | 15.8% |
| Single householder, no children | 1.5% | 5.5% | 10.8% |