| | California, MO | Knob Noster, MO | United States |
| Population | 4,556 | 2,754 | 329,725,481 |
| Female Population | 53.6% | 46.4% | 50.5% |
| Male Population | 46.4% | 53.6% | 49.5% |
| Median Age | 36.3 | 28.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 4,308 | 2,727 | 309,327,143 |
| Population - 2000 | 4,005 | 2,462 | 285,036,114 |
| Population - 1990 | 3,465 | 2,261 | 251,960,433 |
| Pop. 2000 to Now | 9.9% | 13.7% | 15.6% |
| Pop. 1990 to Now | 27.1% | 23.8% | 30.8% |
| space4 | | | |
| Population Density | 1,215.3 | 955.9 | 93.4 |
| Land Area | 3.7 | 2.9 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | California, MO | Knob Noster, MO | United States |
| Age 0 to 4 | 5.0% | 9.2% | 5.9% |
| Age 5 to 9 | 6.1% | 5.9% | 6.1% |
| Age 10 to 14 | 7.8% | 6.9% | 6.6% |
| Age 15 to 17 | 6.4% | 2.9% | 3.9% |
| Age 18 to 20 | 4.8% | 4.8% | 4.0% |
| Age 21 to 24 | 3.6% | 8.1% | 5.2% |
| Age 25 to 34 | 13.3% | 23.4% | 13.8% |
| Age 35 to 44 | 14.1% | 13.0% | 12.9% |
| Age 45 to 54 | 11.2% | 7.5% | 12.6% |
| Age 55 to 59 | 5.4% | 5.7% | 6.7% |
| Age 60 to 64 | 5.7% | 4.8% | 6.3% |
| Age 65 to 74 | 9.7% | 4.4% | 9.6% |
| Age 75 to 84 | 4.7% | 2.9% | 4.5% |
| Age 85 and over | 2.3% | 0.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | California, MO | Knob Noster, MO | United States |
| White | 80.9% | 76.1% | 59.4% |
| Black | 2.7% | 6.5% | 12.2% |
| Asian | 0.8% | 6.7% | 5.6% |
| Native American | 0.0% | 0.5% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 1.2% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 3.5% | 4.6% | 3.2% |
| Hispanic | 12.1% | 4.3% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | California, MO | Knob Noster, MO | United States |
| Married Population | 46.8% | 48.8% | 49.8% |
| Currently Married | 45.6% | 46.8% | 48.0% |
| Married but Separated | 1.2% | 2.0% | 1.8% |
| Single Population | 53.2% | 51.2% | 50.2% |
| Never Married | 28.5% | 38.3% | 33.8% |
| Divorced | 16.7% | 8.4% | 10.8% |
| Widowed | 8.0% | 4.5% | 5.6% |
| space5 | | | |
| Household Size | 2.54 | 2.37 | 2.60 |
| Households | 1,761 | 1,161 | 124,010,992 |
| Family Households | 1,105 | 587 | 80,755,759 |
| Married couple, w/children | 34.4% | 35.9% | 30.5% |
| Married couple, no children | 35.6% | 36.6% | 42.9% |
| Non Family Households | 656 | 574 | 43,255,233 |
| Single householder, w/children | 22.5% | 19.1% | 15.8% |
| Single householder, no children | 7.5% | 8.3% | 10.8% |