| | Grafton, ND | Caribou, ME | United States |
| Population | 4,186 | 7,448 | 329,725,481 |
| Female Population | 51.3% | 46.3% | 50.5% |
| Male Population | 48.7% | 53.7% | 49.5% |
| Median Age | 43.4 | 52.1 | 38.4 |
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| Population - 2010 | 4,282 | 8,167 | 309,327,143 |
| Population - 2000 | 4,516 | 8,312 | 285,036,114 |
| Population - 1990 | 4,840 | 9,415 | 251,960,433 |
| Pop. 2000 to Now | -9.8% | -8.3% | 15.6% |
| Pop. 1990 to Now | -15.8% | -19.0% | 30.8% |
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| Population Density | 1,267.3 | 93.9 | 93.4 |
| Land Area | 3.3 | 79.3 | 3,531,905.4 |
| Water Area | 0.3 | 0.8 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Grafton, ND | Caribou, ME | United States |
| Age 0 to 4 | 5.4% | 5.5% | 5.9% |
| Age 5 to 9 | 9.4% | 3.6% | 6.1% |
| Age 10 to 14 | 4.6% | 3.2% | 6.6% |
| Age 15 to 17 | 2.9% | 2.5% | 3.9% |
| Age 18 to 20 | 4.1% | 3.6% | 4.0% |
| Age 21 to 24 | 4.5% | 5.5% | 5.2% |
| Age 25 to 34 | 11.2% | 10.8% | 13.8% |
| Age 35 to 44 | 9.9% | 8.6% | 12.9% |
| Age 45 to 54 | 13.0% | 12.5% | 12.6% |
| Age 55 to 59 | 7.4% | 11.9% | 6.7% |
| Age 60 to 64 | 7.0% | 6.9% | 6.3% |
| Age 65 to 74 | 11.1% | 14.0% | 9.6% |
| Age 75 to 84 | 3.8% | 6.0% | 4.5% |
| Age 85 and over | 5.7% | 5.5% | 1.9% |
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| Race | | | |
| | Grafton, ND | Caribou, ME | United States |
| White | 70.9% | 91.8% | 59.4% |
| Black | 1.1% | 0.0% | 12.2% |
| Asian | 1.3% | 0.3% | 5.6% |
| Native American | 2.4% | 1.8% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.3% | 5.4% | 3.2% |
| Hispanic | 23.0% | 0.6% | 18.4% |
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| Marriage & Family | | | |
| | Grafton, ND | Caribou, ME | United States |
| Married Population | 50.3% | 50.4% | 49.8% |
| Currently Married | 46.6% | 48.9% | 48.0% |
| Married but Separated | 3.7% | 1.5% | 1.8% |
| Single Population | 49.7% | 49.6% | 50.2% |
| Never Married | 30.7% | 25.8% | 33.8% |
| Divorced | 10.7% | 15.3% | 10.8% |
| Widowed | 8.2% | 8.4% | 5.6% |
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| Household Size | 2.13 | 2.06 | 2.60 |
| Households | 1,821 | 3,540 | 124,010,992 |
| Family Households | 956 | 1,942 | 80,755,759 |
| Married couple, w/children | 26.4% | 18.3% | 30.5% |
| Married couple, no children | 54.8% | 58.5% | 42.9% |
| Non Family Households | 865 | 1,598 | 43,255,233 |
| Single householder, w/children | 14.6% | 13.0% | 15.8% |
| Single householder, no children | 4.2% | 10.1% | 10.8% |