| | Discovery Bay, CA | Agoura Hills, CA | United States |
| Population | 15,704 | 20,362 | 329,725,481 |
| Female Population | 49.0% | 49.3% | 50.5% |
| Male Population | 51.0% | 50.7% | 49.5% |
| Median Age | 43.7 | 44.8 | 38.4 |
| space3 | | | |
| Population - 2010 | 11,438 | 20,336 | 309,327,143 |
| Population - 2000 | 8,981 | 20,537 | 285,036,114 |
| Population - 1990 | 5,351 | 20,390 | 251,960,433 |
| Pop. 2000 to Now | 77.2% | -3.2% | 15.6% |
| Pop. 1990 to Now | 197.4% | -2.5% | 30.8% |
| space4 | | | |
| Population Density | 4,160.0 | 2,610.2 | 93.4 |
| Land Area | 3.8 | 7.8 | 3,531,905.4 |
| Water Area | 1.2 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Discovery Bay, CA | Agoura Hills, CA | United States |
| Age 0 to 4 | 6.5% | 3.0% | 5.9% |
| Age 5 to 9 | 5.4% | 5.1% | 6.1% |
| Age 10 to 14 | 6.3% | 8.6% | 6.6% |
| Age 15 to 17 | 4.7% | 5.3% | 3.9% |
| Age 18 to 20 | 3.7% | 3.2% | 4.0% |
| Age 21 to 24 | 3.6% | 4.5% | 5.2% |
| Age 25 to 34 | 9.9% | 8.7% | 13.8% |
| Age 35 to 44 | 11.7% | 12.1% | 12.9% |
| Age 45 to 54 | 15.9% | 15.2% | 12.6% |
| Age 55 to 59 | 8.5% | 9.9% | 6.7% |
| Age 60 to 64 | 6.8% | 8.8% | 6.3% |
| Age 65 to 74 | 8.9% | 10.0% | 9.6% |
| Age 75 to 84 | 6.0% | 3.1% | 4.5% |
| Age 85 and over | 2.0% | 2.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Discovery Bay, CA | Agoura Hills, CA | United States |
| White | 66.9% | 72.4% | 59.4% |
| Black | 3.5% | 1.5% | 12.2% |
| Asian | 5.0% | 6.7% | 5.6% |
| Native American | 0.1% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.1% | 0.2% | 0.2% |
| Other | 1.1% | 1.0% | 0.4% |
| Two or More Races | 4.1% | 3.8% | 3.2% |
| Hispanic | 19.2% | 14.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Discovery Bay, CA | Agoura Hills, CA | United States |
| Married Population | 64.2% | 60.6% | 49.8% |
| Currently Married | 63.0% | 59.3% | 48.0% |
| Married but Separated | 1.2% | 1.3% | 1.8% |
| Single Population | 35.8% | 39.4% | 50.2% |
| Never Married | 22.4% | 27.3% | 33.8% |
| Divorced | 10.4% | 9.2% | 10.8% |
| Widowed | 3.0% | 2.9% | 5.6% |
| space5 | | | |
| Household Size | 2.84 | 2.77 | 2.60 |
| Households | 5,516 | 7,314 | 124,010,992 |
| Family Households | 4,485 | 5,580 | 80,755,759 |
| Married couple, w/children | 34.3% | 36.0% | 30.5% |
| Married couple, no children | 48.2% | 49.7% | 42.9% |
| Non Family Households | 1,031 | 1,734 | 43,255,233 |
| Single householder, w/children | 9.6% | 7.2% | 15.8% |
| Single householder, no children | 7.8% | 7.2% | 10.8% |