| PEOPLE | Reston | San Diego Country Estates | United States |
| Population | 58,404 | 10,109 | 308,035,306 |
| Pop. Density | 3,810 | 600 | 87 |
| Pop. Change | 7.31% | 11.03% | 8.07% |
| Median Age | 38.1 | 41.1 | 37.3 |
| Households | 25,522 | 3,441 | 116,716,292 |
| Household Size | 2.29 | 2.94 | 2.58 |
| Male Population | 48.30% | 50.28% | 49.27% |
| Female Population | 51.70% | 49.72% | 50.96% |
| Married Population | 48.16% | 66.79% | 47.02% |
| Single Population | 51.84% | 33.21% | 52.98% |
| ESTIMATED TOTAL POPULATION BY AGE | | | |
| Age 0 to 4 | 7.09% | 5.35% | 6.56% |
| Age 5 to 9 | 5.77% | 6.52% | 6.61% |
| Age 10 to 14 | 5.04% | 8.25% | 6.71% |
| Age 15 to 17 | 2.95% | 5.19% | 4.21% |
| Age 18 to 20 | 1.34% | 2.98% | 2.95% |
| Age 21 to 24 | 4.44% | 5.25% | 7.01% |
| Age 25 to 34 | 17.98% | 8.95% | 13.33% |
| Age 35 to 44 | 16.43% | 12.89% | 13.33% |
| Age 45 to 49 | 14.57% | 19.50% | 14.61% |
| Age 50 to 54 | 14.57% | 19.50% | 14.61% |
| Age 55 to 59 | 13.05% | 13.90% | 11.84% |
| Age 60 to 64 | 13.05% | 13.90% | 11.84% |
| Age 65 to 74 | 7.37% | 6.32% | 7.05% |
| Age 75 to 84 | 2.93% | 3.76% | 4.24% |
| Age 85 and over | 1.05% | 1.14% | 1.78% |
| RACE | | | |
| White | 70.13% | 90.09% | 72.41% |
| Black | 9.68% | 0.90% | 12.61% |
| Asian | 10.93% | 1.45% | 4.75% |
| American Indian | 0.31% | 0.89% | 0.95% |
| Other | 8.95% | 6.67% | 9.28% |
| Hispanic | 2.35% | 4.10% | 16.35% |
| Non-Hispanic | 97.65% | 95.90% | 83.65% |
| FAMILY | | | |
| Married, w/children | 33.80% | 37.20% | 30.42% |
| Married, no children | 46.23% | 49.06% | 42.46% |
| Single, w/children | 10.93% | 7.10% | 14.39% |
| Single, no children | 9.04% | 6.65% | 12.73% |
| Divorced | 11.01% | 6.53% | 10.62% |
| Separated | 6.55% | 1.21% | 4.97% |
| Widowed | 3.95% | 2.99% | 6.14% |
| Now Married | 48.34% | 67.62% | 46.32% |
| Never Married | 30.15% | 21.65% | 31.95% |
