| PEOPLE | Union City | San Leandro | United States |
| Population | 69,516 | 84,950 | 308,035,306 |
| Pop. Density | 3,571 | 6,367 | 87 |
| Pop. Change | 4.32% | 6.59% | 8.07% |
| Median Age | 36.3 | 39.2 | 37.3 |
| Households | 20,433 | 30,717 | 116,716,292 |
| Household Size | 3.38 | 2.74 | 2.58 |
| Male Population | 49.37% | 48.01% | 49.27% |
| Female Population | 50.63% | 51.99% | 50.96% |
| Married Population | 50.15% | 44.30% | 47.02% |
| Single Population | 49.85% | 55.70% | 52.98% |
| ESTIMATED TOTAL POPULATION BY AGE | | | |
| Age 0 to 4 | 6.83% | 6.21% | 6.56% |
| Age 5 to 9 | 6.52% | 6.10% | 6.61% |
| Age 10 to 14 | 6.55% | 6.09% | 6.71% |
| Age 15 to 17 | 4.33% | 3.93% | 4.21% |
| Age 18 to 20 | 2.65% | 2.44% | 2.95% |
| Age 21 to 24 | 6.63% | 5.86% | 7.01% |
| Age 25 to 34 | 14.63% | 13.40% | 13.33% |
| Age 35 to 44 | 14.66% | 14.22% | 13.33% |
| Age 45 to 49 | 14.22% | 15.61% | 14.61% |
| Age 50 to 54 | 14.22% | 15.61% | 14.61% |
| Age 55 to 59 | 11.88% | 12.38% | 11.84% |
| Age 60 to 64 | 11.88% | 12.38% | 11.84% |
| Age 65 to 74 | 6.34% | 6.52% | 7.05% |
| Age 75 to 84 | 3.29% | 4.65% | 4.24% |
| Age 85 and over | 1.46% | 2.59% | 1.78% |
| RACE | | | |
| White | 23.94% | 37.61% | 72.41% |
| Black | 6.33% | 12.29% | 12.61% |
| Asian | 50.87% | 29.67% | 4.75% |
| American Indian | 0.47% | 0.79% | 0.95% |
| Other | 18.39% | 19.65% | 9.28% |
| Hispanic | 3.44% | 7.40% | 16.35% |
| Non-Hispanic | 96.56% | 92.60% | 83.65% |
| FAMILY | | | |
| Married, w/children | 37.49% | 31.30% | 30.42% |
| Married, no children | 38.87% | 37.64% | 42.46% |
| Single, w/children | 9.55% | 13.47% | 14.39% |
| Single, no children | 14.10% | 17.59% | 12.73% |
| Divorced | 6.45% | 11.60% | 10.62% |
| Separated | 6.60% | 5.46% | 4.97% |
| Widowed | 4.50% | 8.49% | 6.14% |
| Now Married | 49.72% | 43.98% | 46.32% |
| Never Married | 32.72% | 30.48% | 31.95% |
