| | Miller Place, NY | Coram, NY | United States |
| Population | 12,243 | 41,431 | 329,725,481 |
| Female Population | 52.3% | 50.1% | 50.5% |
| Male Population | 47.8% | 49.9% | 49.5% |
| Median Age | 41.2 | 42.6 | 38.4 |
| space3 | | | |
| Population - 2010 | 12,293 | 38,619 | 309,327,143 |
| Population - 2000 | 10,580 | 34,923 | 285,036,114 |
| Population - 1990 | 9,315 | 30,111 | 251,960,433 |
| Pop. 2000 to Now | 9.4% | 15.2% | 15.6% |
| Pop. 1990 to Now | 24.2% | 33.6% | 30.8% |
| space4 | | | |
| Population Density | 1,869.5 | 2,996.6 | 93.4 |
| Land Area | 6.5 | 13.8 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Miller Place, NY | Coram, NY | United States |
| Age 0 to 4 | 3.7% | 5.5% | 5.9% |
| Age 5 to 9 | 5.4% | 5.3% | 6.1% |
| Age 10 to 14 | 8.6% | 6.1% | 6.6% |
| Age 15 to 17 | 6.2% | 3.3% | 3.9% |
| Age 18 to 20 | 4.6% | 3.5% | 4.0% |
| Age 21 to 24 | 6.5% | 5.7% | 5.2% |
| Age 25 to 34 | 9.9% | 13.1% | 13.8% |
| Age 35 to 44 | 9.2% | 10.0% | 12.9% |
| Age 45 to 54 | 14.9% | 17.5% | 12.6% |
| Age 55 to 59 | 7.9% | 8.5% | 6.7% |
| Age 60 to 64 | 3.9% | 5.5% | 6.3% |
| Age 65 to 74 | 12.6% | 9.5% | 9.6% |
| Age 75 to 84 | 5.5% | 5.0% | 4.5% |
| Age 85 and over | 1.0% | 1.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Miller Place, NY | Coram, NY | United States |
| White | 82.4% | 62.7% | 59.4% |
| Black | 0.2% | 9.2% | 12.2% |
| Asian | 2.4% | 4.7% | 5.6% |
| Native American | 0.0% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 1.7% | 0.6% | 0.4% |
| Two or More Races | 0.4% | 3.6% | 3.2% |
| Hispanic | 12.9% | 18.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Miller Place, NY | Coram, NY | United States |
| Married Population | 56.9% | 49.8% | 49.8% |
| Currently Married | 56.5% | 48.1% | 48.0% |
| Married but Separated | 0.4% | 1.6% | 1.8% |
| Single Population | 43.1% | 50.2% | 50.2% |
| Never Married | 31.1% | 32.7% | 33.8% |
| Divorced | 9.0% | 10.7% | 10.8% |
| Widowed | 2.9% | 6.9% | 5.6% |
| space5 | | | |
| Household Size | 3.07 | 2.72 | 2.60 |
| Households | 3,967 | 15,173 | 124,010,992 |
| Family Households | 3,067 | 9,746 | 80,755,759 |
| Married couple, w/children | 41.9% | 32.1% | 30.5% |
| Married couple, no children | 48.1% | 42.7% | 42.9% |
| Non Family Households | 900 | 5,427 | 43,255,233 |
| Single householder, w/children | 5.0% | 10.3% | 15.8% |
| Single householder, no children | 5.1% | 14.9% | 10.8% |