| | Loudon, NH | Gilford, NH | United States |
| Population | 5,601 | 7,642 | 329,725,481 |
| Female Population | 51.1% | 54.0% | 50.5% |
| Male Population | 48.9% | 46.1% | 49.5% |
| Median Age | 55.1 | 47 | 38.4 |
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| Population - 2010 | 5,287 | 7,091 | 309,327,143 |
| Population - 2000 | 4,481 | 6,803 | 285,036,114 |
| Population - 1990 | 4,114 | 5,867 | 251,960,433 |
| Pop. 2000 to Now | 27.1% | 7.0% | 15.6% |
| Pop. 1990 to Now | 38.5% | 24.1% | 30.8% |
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| Population Density | 119.7 | 195.5 | 93.4 |
| Land Area | 46.8 | 39.1 | 3,531,905.4 |
| Water Area | 0.6 | 14.8 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Loudon, NH | Gilford, NH | United States |
| Age 0 to 4 | 2.6% | 6.4% | 5.9% |
| Age 5 to 9 | 0.0% | 4.7% | 6.1% |
| Age 10 to 14 | 6.6% | 7.1% | 6.6% |
| Age 15 to 17 | 4.5% | 1.6% | 3.9% |
| Age 18 to 20 | 2.7% | 2.0% | 4.0% |
| Age 21 to 24 | 2.0% | 3.0% | 5.2% |
| Age 25 to 34 | 7.3% | 8.0% | 13.8% |
| Age 35 to 44 | 12.5% | 12.9% | 12.9% |
| Age 45 to 54 | 11.5% | 15.1% | 12.6% |
| Age 55 to 59 | 9.1% | 9.6% | 6.7% |
| Age 60 to 64 | 17.9% | 8.3% | 6.3% |
| Age 65 to 74 | 16.3% | 14.9% | 9.6% |
| Age 75 to 84 | 5.2% | 5.3% | 4.5% |
| Age 85 and over | 2.0% | 1.1% | 1.9% |
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| Race | | | |
| | Loudon, NH | Gilford, NH | United States |
| White | 97.1% | 90.9% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.5% | 4.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 2.4% | 2.8% | 3.2% |
| Hispanic | 0.0% | 2.2% | 18.4% |
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| Marriage & Family | | | |
| | Loudon, NH | Gilford, NH | United States |
| Married Population | 64.0% | 61.6% | 49.8% |
| Currently Married | 63.1% | 60.8% | 48.0% |
| Married but Separated | 0.9% | 0.7% | 1.8% |
| Single Population | 36.0% | 38.4% | 50.2% |
| Never Married | 21.0% | 20.7% | 33.8% |
| Divorced | 10.1% | 13.3% | 10.8% |
| Widowed | 5.0% | 4.4% | 5.6% |
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| Household Size | 2.42 | 2.48 | 2.60 |
| Households | 2,319 | 3,086 | 124,010,992 |
| Family Households | 1,753 | 2,213 | 80,755,759 |
| Married couple, w/children | 20.3% | 32.1% | 30.5% |
| Married couple, no children | 66.1% | 50.8% | 42.9% |
| Non Family Households | 566 | 873 | 43,255,233 |
| Single householder, w/children | 5.4% | 9.4% | 15.8% |
| Single householder, no children | 8.3% | 7.7% | 10.8% |