| PEOPLE | Summit | Lake Forest | United States |
| Population | 21,457 | 19,375 | 308,035,306 |
| Pop. Density | 3,579 | 1,128 | 87 |
| Pop. Change | 1.66% | -2.73% | 8.07% |
| Median Age | 39.7 | 45.5 | 37.3 |
| Households | 7,708 | 6,763 | 116,716,292 |
| Household Size | 2.77 | 2.69 | 2.58 |
| Male Population | 49.18% | 48.23% | 49.27% |
| Female Population | 50.82% | 51.77% | 50.96% |
| Married Population | 55.71% | 59.02% | 47.02% |
| Single Population | 44.29% | 40.98% | 52.98% |
| ESTIMATED TOTAL POPULATION BY AGE | | | |
| Age 0 to 4 | 6.81% | 3.93% | 6.56% |
| Age 5 to 9 | 8.57% | 7.10% | 6.61% |
| Age 10 to 14 | 8.84% | 9.16% | 6.71% |
| Age 15 to 17 | 4.83% | 5.73% | 4.21% |
| Age 18 to 20 | 1.68% | 3.81% | 2.95% |
| Age 21 to 24 | 3.24% | 6.11% | 7.01% |
| Age 25 to 34 | 9.23% | 3.76% | 13.33% |
| Age 35 to 44 | 16.39% | 9.53% | 13.33% |
| Age 45 to 49 | 17.48% | 18.12% | 14.61% |
| Age 50 to 54 | 17.48% | 18.12% | 14.61% |
| Age 55 to 59 | 11.08% | 15.30% | 11.84% |
| Age 60 to 64 | 11.08% | 15.30% | 11.84% |
| Age 65 to 74 | 5.77% | 8.67% | 7.05% |
| Age 75 to 84 | 4.03% | 5.90% | 4.24% |
| Age 85 and over | 2.05% | 2.87% | 1.78% |
| RACE | | | |
| White | 83.54% | 92.11% | 72.41% |
| Black | 4.52% | 1.10% | 12.61% |
| Asian | 6.38% | 4.67% | 4.75% |
| American Indian | 0.14% | 0.14% | 0.95% |
| Other | 5.42% | 1.98% | 9.28% |
| Hispanic | 0.82% | 1.66% | 16.35% |
| Non-Hispanic | 99.18% | 98.34% | 83.65% |
| FAMILY | | | |
| Married, w/children | 47.82% | 39.64% | 30.42% |
| Married, no children | 36.83% | 50.56% | 42.46% |
| Single, w/children | 7.58% | 5.37% | 14.39% |
| Single, no children | 7.78% | 4.42% | 12.73% |
| Divorced | 6.41% | 5.36% | 10.62% |
| Separated | 3.57% | 4.54% | 4.97% |
| Widowed | 5.15% | 5.37% | 6.14% |
| Now Married | 55.45% | 59.22% | 46.32% |
| Never Married | 29.42% | 25.51% | 31.95% |
