| Statistic | Glencarlyn | Arlington | Virginia |
| Population | 2,271 | 236,434 | 8,535,519 |
| Population density (sq mi) | 2,543 | 9,095 | 218 |
| Median age | 42.8 | 34.8 | 37.8 |
| Male/Female ratio | 0.9:1 | 1.0:1 | 1.0:1 |
| Married (15yrs & older) | n/a | 47% | 57% |
| Families w/ Kids under 18 | 48% | 43% | 44% |
| Speak English | n/a | 71% | 84% |
| Speak Spanish | n/a | 13% | 7% |
| Race | Glencarlyn | Arlington | Virginia |
| White | 64.82% | 69.05% | 68.75% |
| Black | 5.62% | 9.22% | 19.21% |
| Asian | 16.84% | 10.35% | 6.05% |
| American Indian | 0.54% | 0.36% | 0.26% |
| Native Hawaiian | 0.00% | 0.12% | 0.07% |
| Mixed race | 7.87% | 5.80% | 3.37% |
| Other race | 4.31% | 5.10% | 2.30% |
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