| | West Menlo Park, CA | Coto de Caza, CA | United States |
| Population | 3,492 | 15,873 | 329,725,481 |
| Female Population | 54.1% | 50.7% | 50.5% |
| Male Population | 45.9% | 49.3% | 49.5% |
| Median Age | 40.6 | 45.8 | 38.4 |
| space3 | | | |
| Population - 2010 | 3,401 | 15,453 | 309,327,143 |
| Population - 2000 | 3,629 | 13,057 | 285,036,114 |
| Population - 1990 | 3,959 | 2,853 | 251,960,433 |
| Pop. 2000 to Now | 2.2% | 14.0% | 15.6% |
| Pop. 1990 to Now | -6.3% | 421.7% | 30.8% |
| space4 | | | |
| Population Density | 7,170.4 | 2,055.8 | 93.4 |
| Land Area | 0.5 | 7.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | West Menlo Park, CA | Coto de Caza, CA | United States |
| Age 0 to 4 | 5.3% | 3.2% | 5.9% |
| Age 5 to 9 | 9.5% | 5.0% | 6.1% |
| Age 10 to 14 | 12.2% | 7.6% | 6.6% |
| Age 15 to 17 | 5.2% | 6.6% | 3.9% |
| Age 18 to 20 | 1.8% | 4.2% | 4.0% |
| Age 21 to 24 | 2.1% | 3.6% | 5.2% |
| Age 25 to 34 | 7.9% | 9.2% | 13.8% |
| Age 35 to 44 | 12.2% | 9.4% | 12.9% |
| Age 45 to 54 | 22.1% | 18.6% | 12.6% |
| Age 55 to 59 | 6.7% | 10.9% | 6.7% |
| Age 60 to 64 | 3.4% | 8.8% | 6.3% |
| Age 65 to 74 | 6.4% | 9.1% | 9.6% |
| Age 75 to 84 | 3.1% | 3.1% | 4.5% |
| Age 85 and over | 2.3% | 0.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | West Menlo Park, CA | Coto de Caza, CA | United States |
| White | 74.3% | 72.3% | 59.4% |
| Black | 0.1% | 1.3% | 12.2% |
| Asian | 15.3% | 8.5% | 5.6% |
| Native American | 0.0% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.2% | 0.4% |
| Two or More Races | 4.8% | 3.7% | 3.2% |
| Hispanic | 5.5% | 13.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | West Menlo Park, CA | Coto de Caza, CA | United States |
| Married Population | 64.9% | 64.6% | 49.8% |
| Currently Married | 63.7% | 64.3% | 48.0% |
| Married but Separated | 1.3% | 0.3% | 1.8% |
| Single Population | 35.1% | 35.4% | 50.2% |
| Never Married | 23.4% | 27.5% | 33.8% |
| Divorced | 8.3% | 5.5% | 10.8% |
| Widowed | 3.4% | 2.3% | 5.6% |
| space5 | | | |
| Household Size | 2.86 | 3.15 | 2.60 |
| Households | 1,215 | 5,033 | 124,010,992 |
| Family Households | 975 | 4,603 | 80,755,759 |
| Married couple, w/children | 53.3% | 37.3% | 30.5% |
| Married couple, no children | 27.5% | 50.6% | 42.9% |
| Non Family Households | 240 | 430 | 43,255,233 |
| Single householder, w/children | 13.5% | 5.1% | 15.8% |
| Single householder, no children | 5.6% | 7.0% | 10.8% |