| | Gruver, TX | Islesboro, ME | United States |
| Population | 1,634 | 600 | 329,725,481 |
| Female Population | 39.7% | 48.0% | 50.5% |
| Male Population | 60.3% | 52.0% | 49.5% |
| Median Age | 30.7 | 62.3 | 38.4 |
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| Population - 2010 | 1,191 | 567 | 309,327,143 |
| Population - 2000 | 1,162 | 603 | 285,036,114 |
| Population - 1990 | 1,172 | 579 | 251,960,433 |
| Pop. 2000 to Now | -4.4% | -6.8% | 15.6% |
| Pop. 1990 to Now | -5.2% | -2.9% | 30.8% |
| space4 | | | |
| Population Density | 1,482.8 | 42.0 | 93.4 |
| Land Area | 1.1 | 14.3 | 3,531,905.4 |
| Water Area | 0.0 | 54.6 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Gruver, TX | Islesboro, ME | United States |
| Age 0 to 4 | 7.3% | 2.2% | 5.9% |
| Age 5 to 9 | 8.1% | 2.7% | 6.1% |
| Age 10 to 14 | 8.8% | 7.8% | 6.6% |
| Age 15 to 17 | 5.0% | 1.7% | 3.9% |
| Age 18 to 20 | 3.1% | 2.0% | 4.0% |
| Age 21 to 24 | 9.5% | 0.8% | 5.2% |
| Age 25 to 34 | 15.0% | 9.2% | 13.8% |
| Age 35 to 44 | 8.4% | 7.8% | 12.9% |
| Age 45 to 54 | 11.3% | 9.7% | 12.6% |
| Age 55 to 59 | 6.4% | 4.3% | 6.7% |
| Age 60 to 64 | 4.2% | 6.8% | 6.3% |
| Age 65 to 74 | 7.4% | 31.7% | 9.6% |
| Age 75 to 84 | 3.4% | 9.8% | 4.5% |
| Age 85 and over | 2.1% | 3.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Gruver, TX | Islesboro, ME | United States |
| White | 45.0% | 99.7% | 59.4% |
| Black | 0.0% | 0.3% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 2.3% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 2.2% | 0.0% | 3.2% |
| Hispanic | 50.5% | 0.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Gruver, TX | Islesboro, ME | United States |
| Married Population | 57.2% | 52.1% | 49.8% |
| Currently Married | 51.7% | 51.5% | 48.0% |
| Married but Separated | 5.5% | 0.6% | 1.8% |
| Single Population | 42.8% | 47.9% | 50.2% |
| Never Married | 28.9% | 25.8% | 33.8% |
| Divorced | 9.8% | 17.4% | 10.8% |
| Widowed | 4.1% | 4.8% | 5.6% |
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| Household Size | 3.50 | 1.78 | 2.60 |
| Households | 467 | 329 | 124,010,992 |
| Family Households | 345 | 177 | 80,755,759 |
| Married couple, w/children | 38.0% | 28.8% | 30.5% |
| Married couple, no children | 38.8% | 52.5% | 42.9% |
| Non Family Households | 122 | 152 | 43,255,233 |
| Single householder, w/children | 13.9% | 15.3% | 15.8% |
| Single householder, no children | 9.3% | 3.4% | 10.8% |