| PEOPLE | San Luis Obispo | Irvine | United States |
| Population | 45,119 | 212,375 | 308,035,306 |
| Pop. Density | 3,531 | 3,213 | 87 |
| Pop. Change | 5.08% | 45.98% | 8.07% |
| Median Age | 26.8 | 33.9 | 37.3 |
| Households | 19,193 | 78,978 | 116,716,292 |
| Household Size | 2.29 | 2.6 | 2.58 |
| Male Population | 52.17% | 48.70% | 49.27% |
| Female Population | 47.83% | 51.30% | 50.96% |
| Married Population | 29.60% | 47.32% | 47.02% |
| Single Population | 70.40% | 52.68% | 52.98% |
| ESTIMATED TOTAL POPULATION BY AGE | | | |
| Age 0 to 4 | 3.34% | 5.65% | 6.56% |
| Age 5 to 9 | 3.42% | 6.00% | 6.61% |
| Age 10 to 14 | 3.25% | 6.05% | 6.71% |
| Age 15 to 17 | 2.22% | 3.81% | 4.21% |
| Age 18 to 20 | 5.14% | 4.72% | 2.95% |
| Age 21 to 24 | 29.59% | 9.59% | 7.01% |
| Age 25 to 34 | 13.24% | 15.80% | 13.33% |
| Age 35 to 44 | 8.10% | 15.59% | 13.33% |
| Age 45 to 49 | 10.06% | 14.05% | 14.61% |
| Age 50 to 54 | 10.06% | 14.05% | 14.61% |
| Age 55 to 59 | 9.59% | 10.05% | 11.84% |
| Age 60 to 64 | 9.59% | 10.05% | 11.84% |
| Age 65 to 74 | 5.28% | 5.11% | 7.05% |
| Age 75 to 84 | 3.96% | 2.49% | 4.24% |
| Age 85 and over | 2.80% | 1.09% | 1.78% |
| RACE | | | |
| White | 84.48% | 50.48% | 72.41% |
| Black | 1.16% | 1.75% | 12.61% |
| Asian | 5.21% | 39.16% | 4.75% |
| American Indian | 0.61% | 0.17% | 0.95% |
| Other | 8.54% | 8.43% | 9.28% |
| Hispanic | 10.48% | 76.67% | 16.35% |
| Non-Hispanic | 89.52% | 23.33% | 83.65% |
| FAMILY | | | |
| Married, w/children | 27.46% | 40.46% | 30.42% |
| Married, no children | 47.29% | 39.09% | 42.46% |
| Single, w/children | 11.47% | 9.34% | 14.39% |
| Single, no children | 13.78% | 11.11% | 12.73% |
| Divorced | 8.10% | 9.07% | 10.62% |
| Separated | 2.69% | 4.52% | 4.97% |
| Widowed | 4.18% | 3.64% | 6.14% |
| Now Married | 29.12% | 46.91% | 46.32% |
| Never Married | 55.91% | 35.85% | 31.95% |
