| PEOPLE | Martinsburg | Placerville | United States |
| Population | 17,227 | 10,389 | 308,035,306 |
| Pop. Density | 2,592 | 1,788 | 87 |
| Pop. Change | 13.76% | 9.27% | 8.07% |
| Median Age | 37.1 | 40.4 | 37.3 |
| Households | 7,293 | 4,129 | 116,716,292 |
| Household Size | 2.34 | 2.37 | 2.58 |
| Male Population | 48.81% | 47.45% | 49.27% |
| Female Population | 51.19% | 52.55% | 50.96% |
| Married Population | 36.07% | 39.10% | 47.02% |
| Single Population | 63.93% | 60.90% | 52.98% |
| ESTIMATED TOTAL POPULATION BY AGE | | | |
| Age 0 to 4 | 7.21% | 6.37% | 6.56% |
| Age 5 to 9 | 6.41% | 5.82% | 6.61% |
| Age 10 to 14 | 5.98% | 5.78% | 6.71% |
| Age 15 to 17 | 3.73% | 3.94% | 4.21% |
| Age 18 to 20 | 2.21% | 2.70% | 2.95% |
| Age 21 to 24 | 6.44% | 6.65% | 7.01% |
| Age 25 to 34 | 15.11% | 12.96% | 13.33% |
| Age 35 to 44 | 13.20% | 10.80% | 13.33% |
| Age 45 to 49 | 13.79% | 14.45% | 14.61% |
| Age 50 to 54 | 13.79% | 14.45% | 14.61% |
| Age 55 to 59 | 12.56% | 12.80% | 11.84% |
| Age 60 to 64 | 12.56% | 12.80% | 11.84% |
| Age 65 to 74 | 6.72% | 7.77% | 7.05% |
| Age 75 to 84 | 4.55% | 6.00% | 4.24% |
| Age 85 and over | 2.08% | 3.96% | 1.78% |
| RACE | | | |
| White | 77.45% | 83.90% | 72.41% |
| Black | 14.92% | 0.77% | 12.61% |
| Asian | 1.18% | 0.94% | 4.75% |
| American Indian | 0.35% | 1.56% | 0.95% |
| Other | 6.09% | 12.83% | 9.28% |
| Hispanic | 1.64% | 10.29% | 16.35% |
| Non-Hispanic | 98.36% | 89.71% | 83.65% |
| FAMILY | | | |
| Married, w/children | 24.33% | 24.50% | 30.42% |
| Married, no children | 38.36% | 40.80% | 42.46% |
| Single, w/children | 21.89% | 21.50% | 14.39% |
| Single, no children | 15.42% | 13.21% | 12.73% |
| Divorced | 18.59% | 16.35% | 10.62% |
| Separated | 6.35% | 4.86% | 4.97% |
| Widowed | 10.58% | 7.36% | 6.14% |
| Now Married | 35.70% | 39.77% | 46.32% |
| Never Married | 28.78% | 31.67% | 31.95% |
