| Statistic | Grantsville | West Virginia | National |
| Population | 528 | 1,792,147 | 328,239,523 |
| Population density (sq mi) | 1,213 | 74 | 91 |
| Median age | 42.9 | 41.9 | 37.7 |
| Male/Female ratio | 1.0:1 | 1.0:1 | 1.0:1 |
| Married (15yrs & older) | 60% | 59% | 55% |
| Families w/ Kids under 18 | 42% | 37% | 43% |
| Speak English | 95% | 98% | 79% |
| Speak Spanish | 1% | 1% | 13% |
| Race | Grantsville | West Virginia | National |
| White | 96.59% | 93.46% | 73.35% |
| Black | 0.19% | 3.43% | 12.63% |
| Asian | 0.00% | 0.76% | 5.22% |
| American Indian | 0.00% | 0.18% | 0.82% |
| Native Hawaiian | 0.00% | 0.04% | 0.18% |
| Mixed race | 3.22% | 1.83% | 3.06% |
| Other race | 0.00% | 0.31% | 4.75% |
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