| PEOPLE | Mill Valley | Benson | United States |
| Population | 13,903 | 5,105 | 308,035,306 |
| Pop. Density | 2,919 | 123 | 87 |
| Pop. Change | 1.19% | 5.36% | 8.07% |
| Median Age | 46.6 | 52.3 | 37.3 |
| Households | 6,084 | 2,369 | 116,716,292 |
| Household Size | 2.27 | 2.16 | 2.58 |
| Male Population | 46.03% | 48.40% | 49.27% |
| Female Population | 53.97% | 51.60% | 50.96% |
| Married Population | 50.75% | 53.60% | 47.02% |
| Single Population | 49.25% | 46.40% | 52.98% |
| ESTIMATED TOTAL POPULATION BY AGE | | | |
| Age 0 to 4 | 5.93% | 4.88% | 6.56% |
| Age 5 to 9 | 7.47% | 4.78% | 6.61% |
| Age 10 to 14 | 6.54% | 5.01% | 6.71% |
| Age 15 to 17 | 3.73% | 3.29% | 4.21% |
| Age 18 to 20 | 1.13% | 1.86% | 2.95% |
| Age 21 to 24 | 2.17% | 4.33% | 7.01% |
| Age 25 to 34 | 5.29% | 9.46% | 13.33% |
| Age 35 to 44 | 14.97% | 8.09% | 13.33% |
| Age 45 to 49 | 17.64% | 11.64% | 14.61% |
| Age 50 to 54 | 17.64% | 11.64% | 14.61% |
| Age 55 to 59 | 16.27% | 15.38% | 11.84% |
| Age 60 to 64 | 16.27% | 15.38% | 11.84% |
| Age 65 to 74 | 9.80% | 16.79% | 7.05% |
| Age 75 to 84 | 5.68% | 10.42% | 4.24% |
| Age 85 and over | 3.39% | 4.07% | 1.78% |
| RACE | | | |
| White | 88.77% | 87.78% | 72.41% |
| Black | 0.85% | 1.00% | 12.61% |
| Asian | 5.43% | 0.72% | 4.75% |
| American Indian | 0.17% | 0.96% | 0.95% |
| Other | 4.79% | 9.54% | 9.28% |
| Hispanic | 11.91% | 1.11% | 16.35% |
| Non-Hispanic | 88.09% | 98.89% | 83.65% |
| FAMILY | | | |
| Married, w/children | 39.70% | 17.09% | 30.42% |
| Married, no children | 42.57% | 59.19% | 42.46% |
| Single, w/children | 10.89% | 11.47% | 14.39% |
| Single, no children | 6.84% | 12.25% | 12.73% |
| Divorced | 13.59% | 13.64% | 10.62% |
| Separated | 2.42% | 2.91% | 4.97% |
| Widowed | 6.04% | 11.53% | 6.14% |
| Now Married | 51.24% | 53.40% | 46.32% |
| Never Married | 26.71% | 18.53% | 31.95% |
