| | Twentynine Palms, CA | Martinsville, VA | United States |
| Population | 27,176 | 13,476 | 329,725,481 |
| Female Population | 43.5% | 53.7% | 50.5% |
| Male Population | 56.5% | 46.4% | 49.5% |
| Median Age | 24.2 | 40.6 | 38.4 |
| space3 | | | |
| Population - 2010 | 25,107 | 13,786 | 309,327,143 |
| Population - 2000 | 14,764 | 15,416 | 285,036,114 |
| Population - 1990 | 11,821 | 16,162 | 251,960,433 |
| Pop. 2000 to Now | 85.8% | -19.9% | 15.6% |
| Pop. 1990 to Now | 132.1% | -23.6% | 30.8% |
| space4 | | | |
| Population Density | 462.5 | 1,230.0 | 93.4 |
| Land Area | 58.8 | 11.0 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Twentynine Palms, CA | Martinsville, VA | United States |
| Age 0 to 4 | 13.4% | 7.3% | 5.9% |
| Age 5 to 9 | 7.1% | 7.1% | 6.1% |
| Age 10 to 14 | 4.9% | 6.9% | 6.6% |
| Age 15 to 17 | 3.1% | 4.0% | 3.9% |
| Age 18 to 20 | 8.5% | 4.3% | 4.0% |
| Age 21 to 24 | 15.5% | 4.3% | 5.2% |
| Age 25 to 34 | 20.4% | 10.3% | 13.8% |
| Age 35 to 44 | 10.2% | 11.3% | 12.9% |
| Age 45 to 54 | 5.4% | 13.0% | 12.6% |
| Age 55 to 59 | 3.0% | 7.1% | 6.7% |
| Age 60 to 64 | 3.0% | 7.0% | 6.3% |
| Age 65 to 74 | 3.6% | 10.4% | 9.6% |
| Age 75 to 84 | 1.3% | 4.7% | 4.5% |
| Age 85 and over | 0.6% | 2.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Twentynine Palms, CA | Martinsville, VA | United States |
| White | 52.1% | 42.7% | 59.4% |
| Black | 9.6% | 44.4% | 12.2% |
| Asian | 2.6% | 0.9% | 5.6% |
| Native American | 0.9% | 0.6% | 0.6% |
| Hawaiian, Pacific Islander | 1.9% | 0.1% | 0.2% |
| Other | 0.1% | 1.1% | 0.4% |
| Two or More Races | 8.7% | 3.6% | 3.2% |
| Hispanic | 24.1% | 6.7% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Twentynine Palms, CA | Martinsville, VA | United States |
| Married Population | 50.2% | 39.1% | 49.8% |
| Currently Married | 48.9% | 36.3% | 48.0% |
| Married but Separated | 1.3% | 2.9% | 1.8% |
| Single Population | 49.8% | 60.9% | 50.2% |
| Never Married | 38.4% | 36.9% | 33.8% |
| Divorced | 9.0% | 15.5% | 10.8% |
| Widowed | 2.4% | 8.5% | 5.6% |
| space5 | | | |
| Household Size | 2.75 | 2.31 | 2.60 |
| Households | 8,671 | 5,656 | 124,010,992 |
| Family Households | 5,755 | 3,162 | 80,755,759 |
| Married couple, w/children | 41.5% | 15.4% | 30.5% |
| Married couple, no children | 33.7% | 37.4% | 42.9% |
| Non Family Households | 2,916 | 2,494 | 43,255,233 |
| Single householder, w/children | 18.1% | 26.6% | 15.8% |
| Single householder, no children | 6.7% | 20.6% | 10.8% |