| | Montgomery, NY | Newport, RI | United States |
| Population | 23,184 | 25,322 | 329,725,481 |
| Female Population | 51.9% | 50.9% | 50.5% |
| Male Population | 48.1% | 49.1% | 49.5% |
| Median Age | 38.9 | 35.2 | 38.4 |
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| Population - 2010 | 22,674 | 24,935 | 309,327,143 |
| Population - 2000 | 20,891 | 26,475 | 285,036,114 |
| Population - 1990 | 18,501 | 28,227 | 251,960,433 |
| Pop. 2000 to Now | 14.2% | -7.8% | 15.6% |
| Pop. 1990 to Now | 29.0% | -13.5% | 30.8% |
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| Population Density | 461.3 | 3,304.0 | 93.4 |
| Land Area | 50.3 | 7.7 | 3,531,905.4 |
| Water Area | 0.9 | 3.7 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Montgomery, NY | Newport, RI | United States |
| Age 0 to 4 | 4.9% | 5.0% | 5.9% |
| Age 5 to 9 | 7.5% | 3.6% | 6.1% |
| Age 10 to 14 | 7.2% | 3.5% | 6.6% |
| Age 15 to 17 | 4.8% | 2.1% | 3.9% |
| Age 18 to 20 | 5.0% | 7.2% | 4.0% |
| Age 21 to 24 | 4.8% | 9.3% | 5.2% |
| Age 25 to 34 | 11.3% | 19.2% | 13.8% |
| Age 35 to 44 | 12.7% | 9.4% | 12.9% |
| Age 45 to 54 | 13.7% | 10.7% | 12.6% |
| Age 55 to 59 | 7.8% | 5.2% | 6.7% |
| Age 60 to 64 | 6.9% | 5.7% | 6.3% |
| Age 65 to 74 | 7.1% | 11.4% | 9.6% |
| Age 75 to 84 | 4.5% | 5.4% | 4.5% |
| Age 85 and over | 1.9% | 2.3% | 1.9% |
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| Race | | | |
| | Montgomery, NY | Newport, RI | United States |
| White | 72.1% | 76.6% | 59.4% |
| Black | 9.3% | 6.6% | 12.2% |
| Asian | 0.8% | 2.2% | 5.6% |
| Native American | 0.0% | 1.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.1% | 0.0% | 0.2% |
| Other | 0.3% | 0.8% | 0.4% |
| Two or More Races | 3.9% | 4.1% | 3.2% |
| Hispanic | 13.4% | 8.6% | 18.4% |
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| Marriage & Family | | | |
| | Montgomery, NY | Newport, RI | United States |
| Married Population | 50.8% | 37.7% | 49.8% |
| Currently Married | 48.9% | 35.8% | 48.0% |
| Married but Separated | 1.8% | 1.9% | 1.8% |
| Single Population | 49.2% | 62.3% | 50.2% |
| Never Married | 32.5% | 46.9% | 33.8% |
| Divorced | 11.1% | 10.6% | 10.8% |
| Widowed | 5.5% | 4.8% | 5.6% |
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| Household Size | 2.72 | 2.15 | 2.60 |
| Households | 8,330 | 10,177 | 124,010,992 |
| Family Households | 5,682 | 5,003 | 80,755,759 |
| Married couple, w/children | 34.0% | 21.1% | 30.5% |
| Married couple, no children | 42.2% | 50.9% | 42.9% |
| Non Family Households | 2,648 | 5,174 | 43,255,233 |
| Single householder, w/children | 16.3% | 16.3% | 15.8% |
| Single householder, no children | 7.5% | 11.7% | 10.8% |