| | Newport, NH | Grantham, NH | United States |
| Population | 6,316 | 3,366 | 329,725,481 |
| Female Population | 51.3% | 53.1% | 50.5% |
| Male Population | 48.7% | 46.9% | 49.5% |
| Median Age | 42.3 | 50.1 | 38.4 |
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| Population - 2010 | 6,507 | 2,976 | 309,327,143 |
| Population - 2000 | 6,269 | 2,167 | 285,036,114 |
| Population - 1990 | 6,110 | 1,247 | 251,960,433 |
| Pop. 2000 to Now | 1.8% | 36.4% | 15.6% |
| Pop. 1990 to Now | 4.4% | 137.0% | 30.8% |
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| Population Density | 145.0 | 123.9 | 93.4 |
| Land Area | 43.6 | 27.2 | 3,531,905.4 |
| Water Area | 0.1 | 0.9 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Newport, NH | Grantham, NH | United States |
| Age 0 to 4 | 4.7% | 0.0% | 5.9% |
| Age 5 to 9 | 5.0% | 8.5% | 6.1% |
| Age 10 to 14 | 3.8% | 9.4% | 6.6% |
| Age 15 to 17 | 4.1% | 5.3% | 3.9% |
| Age 18 to 20 | 6.6% | 4.5% | 4.0% |
| Age 21 to 24 | 5.3% | 2.4% | 5.2% |
| Age 25 to 34 | 14.2% | 1.4% | 13.8% |
| Age 35 to 44 | 10.2% | 13.3% | 12.9% |
| Age 45 to 54 | 14.8% | 14.5% | 12.6% |
| Age 55 to 59 | 6.2% | 13.8% | 6.7% |
| Age 60 to 64 | 7.3% | 6.1% | 6.3% |
| Age 65 to 74 | 9.0% | 11.5% | 9.6% |
| Age 75 to 84 | 4.7% | 7.8% | 4.5% |
| Age 85 and over | 4.4% | 1.5% | 1.9% |
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| Race | | | |
| | Newport, NH | Grantham, NH | United States |
| White | 92.8% | 99.2% | 59.4% |
| Black | 0.5% | 0.0% | 12.2% |
| Asian | 0.5% | 0.0% | 5.6% |
| Native American | 1.2% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 3.1% | 0.0% | 3.2% |
| Hispanic | 1.9% | 0.8% | 18.4% |
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| Marriage & Family | | | |
| | Newport, NH | Grantham, NH | United States |
| Married Population | 39.3% | 70.7% | 49.8% |
| Currently Married | 38.9% | 67.0% | 48.0% |
| Married but Separated | 0.4% | 3.7% | 1.8% |
| Single Population | 60.7% | 29.3% | 50.2% |
| Never Married | 32.8% | 17.9% | 33.8% |
| Divorced | 21.7% | 4.0% | 10.8% |
| Widowed | 6.2% | 7.4% | 5.6% |
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| Household Size | 2.43 | 2.75 | 2.60 |
| Households | 2,554 | 1,224 | 124,010,992 |
| Family Households | 1,400 | 1,024 | 80,755,759 |
| Married couple, w/children | 24.7% | 34.4% | 30.5% |
| Married couple, no children | 47.6% | 58.0% | 42.9% |
| Non Family Households | 1,154 | 200 | 43,255,233 |
| Single householder, w/children | 19.0% | 4.1% | 15.8% |
| Single householder, no children | 8.7% | 3.5% | 10.8% |