| | Azusa, CA | Los Altos, CA | United States |
| Population | 49,457 | 31,562 | 329,725,481 |
| Female Population | 51.2% | 49.7% | 50.5% |
| Male Population | 48.8% | 50.3% | 49.5% |
| Median Age | 30.8 | 45.8 | 38.4 |
| space3 | | | |
| Population - 2010 | 46,539 | 29,132 | 309,327,143 |
| Population - 2000 | 44,712 | 27,693 | 285,036,114 |
| Population - 1990 | 41,333 | 26,303 | 251,960,433 |
| Pop. 2000 to Now | 10.1% | 9.4% | 15.6% |
| Pop. 1990 to Now | 19.1% | 15.1% | 30.8% |
| space4 | | | |
| Population Density | 5,116.1 | 4,869.9 | 93.4 |
| Land Area | 9.7 | 6.5 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Azusa, CA | Los Altos, CA | United States |
| Age 0 to 4 | 6.1% | 4.3% | 5.9% |
| Age 5 to 9 | 6.0% | 6.8% | 6.1% |
| Age 10 to 14 | 6.4% | 8.5% | 6.6% |
| Age 15 to 17 | 3.1% | 5.4% | 3.9% |
| Age 18 to 20 | 8.9% | 2.9% | 4.0% |
| Age 21 to 24 | 9.3% | 3.0% | 5.2% |
| Age 25 to 34 | 15.4% | 7.2% | 13.8% |
| Age 35 to 44 | 12.9% | 10.9% | 12.9% |
| Age 45 to 54 | 11.3% | 18.4% | 12.6% |
| Age 55 to 59 | 5.0% | 6.2% | 6.7% |
| Age 60 to 64 | 5.0% | 7.4% | 6.3% |
| Age 65 to 74 | 6.9% | 9.7% | 9.6% |
| Age 75 to 84 | 2.9% | 6.3% | 4.5% |
| Age 85 and over | 0.9% | 3.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Azusa, CA | Los Altos, CA | United States |
| White | 17.1% | 54.7% | 59.4% |
| Black | 2.8% | 0.8% | 12.2% |
| Asian | 14.6% | 33.8% | 5.6% |
| Native American | 0.1% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.7% | 0.4% |
| Two or More Races | 2.1% | 4.3% | 3.2% |
| Hispanic | 63.2% | 5.8% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Azusa, CA | Los Altos, CA | United States |
| Married Population | 40.6% | 67.7% | 49.8% |
| Currently Married | 38.6% | 67.3% | 48.0% |
| Married but Separated | 1.9% | 0.3% | 1.8% |
| Single Population | 59.4% | 32.3% | 50.2% |
| Never Married | 48.8% | 23.0% | 33.8% |
| Divorced | 7.3% | 5.2% | 10.8% |
| Widowed | 3.3% | 4.1% | 5.6% |
| space5 | | | |
| Household Size | 3.33 | 2.90 | 2.60 |
| Households | 13,384 | 10,805 | 124,010,992 |
| Family Households | 10,098 | 8,869 | 80,755,759 |
| Married couple, w/children | 29.7% | 45.1% | 30.5% |
| Married couple, no children | 36.0% | 45.6% | 42.9% |
| Non Family Households | 3,286 | 1,936 | 43,255,233 |
| Single householder, w/children | 17.5% | 3.7% | 15.8% |
| Single householder, no children | 16.9% | 5.5% | 10.8% |