| | Landaff, NH | Monroe, NH | United States |
| Population | 411 | 837 | 329,725,481 |
| Female Population | 51.8% | 38.4% | 50.5% |
| Male Population | 48.2% | 61.7% | 49.5% |
| Median Age | 56.4 | 50.6 | 38.4 |
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| Population - 2010 | 414 | 787 | 309,327,143 |
| Population - 2000 | 378 | 759 | 285,036,114 |
| Population - 1990 | 350 | 746 | 251,960,433 |
| Pop. 2000 to Now | 16.9% | 6.3% | 15.6% |
| Pop. 1990 to Now | 26.3% | 8.2% | 30.8% |
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| Population Density | 14.5 | 37.5 | 93.4 |
| Land Area | 28.3 | 22.3 | 3,531,905.4 |
| Water Area | 0.1 | 1.5 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Landaff, NH | Monroe, NH | United States |
| Age 0 to 4 | 2.4% | 3.6% | 5.9% |
| Age 5 to 9 | 2.2% | 11.6% | 6.1% |
| Age 10 to 14 | 3.7% | 2.9% | 6.6% |
| Age 15 to 17 | 5.1% | 3.9% | 3.9% |
| Age 18 to 20 | 0.7% | 1.1% | 4.0% |
| Age 21 to 24 | 6.1% | 3.3% | 5.2% |
| Age 25 to 34 | 4.1% | 12.3% | 13.8% |
| Age 35 to 44 | 9.0% | 7.2% | 12.9% |
| Age 45 to 54 | 15.3% | 10.3% | 12.6% |
| Age 55 to 59 | 7.8% | 9.0% | 6.7% |
| Age 60 to 64 | 12.2% | 9.4% | 6.3% |
| Age 65 to 74 | 19.5% | 16.2% | 9.6% |
| Age 75 to 84 | 7.8% | 7.5% | 4.5% |
| Age 85 and over | 4.1% | 1.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Landaff, NH | Monroe, NH | United States |
| White | 96.1% | 99.4% | 59.4% |
| Black | 1.7% | 0.0% | 12.2% |
| Asian | 0.2% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.2% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.7% | 0.6% | 3.2% |
| Hispanic | 0.0% | 0.0% | 18.4% |
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| Marriage & Family | | | |
| | Landaff, NH | Monroe, NH | United States |
| Married Population | 56.0% | 62.2% | 49.8% |
| Currently Married | 54.6% | 62.1% | 48.0% |
| Married but Separated | 1.3% | 0.1% | 1.8% |
| Single Population | 44.0% | 37.8% | 50.2% |
| Never Married | 21.0% | 22.4% | 33.8% |
| Divorced | 13.8% | 12.5% | 10.8% |
| Widowed | 9.3% | 2.8% | 5.6% |
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| Household Size | 2.27 | 2.59 | 2.60 |
| Households | 181 | 323 | 124,010,992 |
| Family Households | 119 | 223 | 80,755,759 |
| Married couple, w/children | 28.6% | 34.1% | 30.5% |
| Married couple, no children | 60.5% | 58.3% | 42.9% |
| Non Family Households | 62 | 100 | 43,255,233 |
| Single householder, w/children | 7.6% | 6.7% | 15.8% |
| Single householder, no children | 3.4% | 0.9% | 10.8% |