| | Oakdale, NY | Miller Place, NY | United States |
| Population | 7,276 | 12,243 | 329,725,481 |
| Female Population | 51.1% | 52.3% | 50.5% |
| Male Population | 48.9% | 47.8% | 49.5% |
| Median Age | 46.9 | 41.2 | 38.4 |
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| Population - 2010 | 7,677 | 12,293 | 309,327,143 |
| Population - 2000 | 8,075 | 10,580 | 285,036,114 |
| Population - 1990 | 7,875 | 9,315 | 251,960,433 |
| Pop. 2000 to Now | -11.0% | 9.4% | 15.6% |
| Pop. 1990 to Now | -8.7% | 24.2% | 30.8% |
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| Population Density | 2,198.2 | 1,869.5 | 93.4 |
| Land Area | 3.3 | 6.5 | 3,531,905.4 |
| Water Area | 0.5 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Oakdale, NY | Miller Place, NY | United States |
| Age 0 to 4 | 4.3% | 3.7% | 5.9% |
| Age 5 to 9 | 2.9% | 5.4% | 6.1% |
| Age 10 to 14 | 5.3% | 8.6% | 6.6% |
| Age 15 to 17 | 2.3% | 6.2% | 3.9% |
| Age 18 to 20 | 2.1% | 4.6% | 4.0% |
| Age 21 to 24 | 4.5% | 6.5% | 5.2% |
| Age 25 to 34 | 17.2% | 9.9% | 13.8% |
| Age 35 to 44 | 7.7% | 9.2% | 12.9% |
| Age 45 to 54 | 14.4% | 14.9% | 12.6% |
| Age 55 to 59 | 7.4% | 7.9% | 6.7% |
| Age 60 to 64 | 7.9% | 3.9% | 6.3% |
| Age 65 to 74 | 13.8% | 12.6% | 9.6% |
| Age 75 to 84 | 8.4% | 5.5% | 4.5% |
| Age 85 and over | 2.0% | 1.0% | 1.9% |
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| Race | | | |
| | Oakdale, NY | Miller Place, NY | United States |
| White | 87.3% | 82.4% | 59.4% |
| Black | 6.4% | 0.2% | 12.2% |
| Asian | 0.6% | 2.4% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 1.7% | 0.4% |
| Two or More Races | 1.0% | 0.4% | 3.2% |
| Hispanic | 4.7% | 12.9% | 18.4% |
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| Marriage & Family | | | |
| | Oakdale, NY | Miller Place, NY | United States |
| Married Population | 50.6% | 56.9% | 49.8% |
| Currently Married | 49.7% | 56.5% | 48.0% |
| Married but Separated | 0.9% | 0.4% | 1.8% |
| Single Population | 49.4% | 43.1% | 50.2% |
| Never Married | 33.8% | 31.1% | 33.8% |
| Divorced | 6.7% | 9.0% | 10.8% |
| Widowed | 8.9% | 2.9% | 5.6% |
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| Household Size | 2.66 | 3.07 | 2.60 |
| Households | 2,717 | 3,967 | 124,010,992 |
| Family Households | 1,772 | 3,067 | 80,755,759 |
| Married couple, w/children | 34.1% | 41.9% | 30.5% |
| Married couple, no children | 47.0% | 48.1% | 42.9% |
| Non Family Households | 945 | 900 | 43,255,233 |
| Single householder, w/children | 0.3% | 5.0% | 15.8% |
| Single householder, no children | 18.6% | 5.1% | 10.8% |