| PEOPLE | Gaithersburg | Costa Mesa | United States |
| Population | 59,933 | 109,960 | 308,035,306 |
| Pop. Density | 5,875 | 7,025 | 87 |
| Pop. Change | 13.84% | 0.82% | 8.07% |
| Median Age | 35.1 | 33.7 | 37.3 |
| Households | 22,000 | 39,946 | 116,716,292 |
| Household Size | 2.68 | 2.66 | 2.58 |
| Male Population | 48.63% | 50.90% | 49.27% |
| Female Population | 51.37% | 49.10% | 50.96% |
| Married Population | 44.31% | 36.92% | 47.02% |
| Single Population | 55.69% | 63.08% | 52.98% |
| ESTIMATED TOTAL POPULATION BY AGE | | | |
| Age 0 to 4 | 8.28% | 6.54% | 6.56% |
| Age 5 to 9 | 6.57% | 5.77% | 6.61% |
| Age 10 to 14 | 5.90% | 5.64% | 6.71% |
| Age 15 to 17 | 3.43% | 3.58% | 4.21% |
| Age 18 to 20 | 1.91% | 2.96% | 2.95% |
| Age 21 to 24 | 5.97% | 8.73% | 7.01% |
| Age 25 to 34 | 17.83% | 19.15% | 13.33% |
| Age 35 to 44 | 15.99% | 15.60% | 13.33% |
| Age 45 to 49 | 14.34% | 13.60% | 14.61% |
| Age 50 to 54 | 14.34% | 13.60% | 14.61% |
| Age 55 to 59 | 10.30% | 9.23% | 11.84% |
| Age 60 to 64 | 10.30% | 9.23% | 11.84% |
| Age 65 to 74 | 4.78% | 4.81% | 7.05% |
| Age 75 to 84 | 2.80% | 3.04% | 4.24% |
| Age 85 and over | 1.90% | 1.34% | 1.78% |
| RACE | | | |
| White | 50.84% | 68.51% | 72.41% |
| Black | 16.27% | 1.49% | 12.61% |
| Asian | 16.93% | 7.87% | 4.75% |
| American Indian | 0.45% | 0.62% | 0.95% |
| Other | 15.51% | 21.50% | 9.28% |
| Hispanic | 0.00% | 54.51% | 16.35% |
| Non-Hispanic | 100.00% | 45.49% | 83.65% |
| FAMILY | | | |
| Married, w/children | 37.18% | 34.29% | 30.42% |
| Married, no children | 35.93% | 36.62% | 42.46% |
| Single, w/children | 14.31% | 13.66% | 14.39% |
| Single, no children | 12.58% | 15.44% | 12.73% |
| Divorced | 9.18% | 11.55% | 10.62% |
| Separated | 7.97% | 7.68% | 4.97% |
| Widowed | 4.78% | 4.18% | 6.14% |
| Now Married | 44.02% | 36.47% | 46.32% |
| Never Married | 34.05% | 40.13% | 31.95% |
