| PEOPLE | Marietta | Riverside | United States |
| Population | 56,579 | 303,871 | 308,035,306 |
| Pop. Density | 2,451 | 3,745 | 87 |
| Pop. Change | -3.76% | 20.94% | 8.07% |
| Median Age | 32.8 | 30 | 37.3 |
| Households | 23,065 | 91,932 | 116,716,292 |
| Household Size | 2.41 | 3.18 | 2.58 |
| Male Population | 48.94% | 49.40% | 49.27% |
| Female Population | 51.06% | 50.60% | 50.96% |
| Married Population | 33.95% | 38.46% | 47.02% |
| Single Population | 66.05% | 61.54% | 52.98% |
| ESTIMATED TOTAL POPULATION BY AGE | | | |
| Age 0 to 4 | 8.21% | 7.20% | 6.56% |
| Age 5 to 9 | 6.57% | 7.08% | 6.61% |
| Age 10 to 14 | 5.38% | 7.53% | 6.71% |
| Age 15 to 17 | 3.29% | 4.97% | 4.21% |
| Age 18 to 20 | 2.70% | 5.29% | 2.95% |
| Age 21 to 24 | 8.91% | 10.22% | 7.01% |
| Age 25 to 34 | 18.85% | 14.32% | 13.33% |
| Age 35 to 44 | 14.49% | 12.82% | 13.33% |
| Age 45 to 49 | 12.21% | 12.92% | 14.61% |
| Age 50 to 54 | 12.21% | 12.92% | 14.61% |
| Age 55 to 59 | 9.34% | 9.01% | 11.84% |
| Age 60 to 64 | 9.34% | 9.01% | 11.84% |
| Age 65 to 74 | 4.92% | 4.61% | 7.05% |
| Age 75 to 84 | 3.23% | 2.84% | 4.24% |
| Age 85 and over | 1.91% | 1.19% | 1.78% |
| RACE | | | |
| White | 52.68% | 56.49% | 72.41% |
| Black | 31.47% | 7.05% | 12.61% |
| Asian | 2.95% | 7.43% | 4.75% |
| American Indian | 0.47% | 1.14% | 0.95% |
| Other | 12.43% | 27.89% | 9.28% |
| Hispanic | 46.81% | 31.21% | 16.35% |
| Non-Hispanic | 53.19% | 68.79% | 83.65% |
| FAMILY | | | |
| Married, w/children | 28.76% | 35.46% | 30.42% |
| Married, no children | 34.09% | 33.73% | 42.46% |
| Single, w/children | 21.04% | 15.62% | 14.39% |
| Single, no children | 16.11% | 15.19% | 12.73% |
| Divorced | 12.36% | 9.85% | 10.62% |
| Separated | 10.15% | 6.37% | 4.97% |
| Widowed | 6.38% | 4.57% | 6.14% |
| Now Married | 33.78% | 38.91% | 46.32% |
| Never Married | 37.33% | 40.30% | 31.95% |
