| | Mount Kisco, NY | Santa Rosa, CA | United States |
| Population | 10,904 | 179,213 | 329,725,481 |
| Female Population | 49.3% | 51.4% | 50.5% |
| Male Population | 50.7% | 48.6% | 49.5% |
| Median Age | 39.8 | 40 | 38.4 |
| space3 | | | |
| Population - 2010 | 10,888 | 175,221 | 309,327,143 |
| Population - 2000 | 9,983 | 147,595 | 285,036,114 |
| Population - 1990 | 9,108 | 113,313 | 251,960,433 |
| Pop. 2000 to Now | 8.1% | 18.3% | 15.6% |
| Pop. 1990 to Now | 18.5% | 54.1% | 30.8% |
| space4 | | | |
| Population Density | 3,592.8 | 4,215.9 | 93.4 |
| Land Area | 3.0 | 42.5 | 3,531,905.4 |
| Water Area | 0.0 | 0.2 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Mount Kisco, NY | Santa Rosa, CA | United States |
| Age 0 to 4 | 10.1% | 5.0% | 5.9% |
| Age 5 to 9 | 4.3% | 5.8% | 6.1% |
| Age 10 to 14 | 5.2% | 6.4% | 6.6% |
| Age 15 to 17 | 2.4% | 3.9% | 3.9% |
| Age 18 to 20 | 1.2% | 3.5% | 4.0% |
| Age 21 to 24 | 5.2% | 4.7% | 5.2% |
| Age 25 to 34 | 12.7% | 13.7% | 13.8% |
| Age 35 to 44 | 15.3% | 13.8% | 12.9% |
| Age 45 to 54 | 13.2% | 12.9% | 12.6% |
| Age 55 to 59 | 6.8% | 6.6% | 6.7% |
| Age 60 to 64 | 6.5% | 6.0% | 6.3% |
| Age 65 to 74 | 9.0% | 10.6% | 9.6% |
| Age 75 to 84 | 5.5% | 4.8% | 4.5% |
| Age 85 and over | 2.5% | 2.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Mount Kisco, NY | Santa Rosa, CA | United States |
| White | 53.8% | 53.8% | 59.4% |
| Black | 5.8% | 1.9% | 12.2% |
| Asian | 2.4% | 5.8% | 5.6% |
| Native American | 0.0% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.4% | 0.2% |
| Other | 0.6% | 0.4% | 0.4% |
| Two or More Races | 1.6% | 3.4% | 3.2% |
| Hispanic | 35.9% | 34.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Mount Kisco, NY | Santa Rosa, CA | United States |
| Married Population | 49.7% | 48.4% | 49.8% |
| Currently Married | 47.7% | 46.4% | 48.0% |
| Married but Separated | 2.0% | 2.0% | 1.8% |
| Single Population | 50.3% | 51.6% | 50.2% |
| Never Married | 31.6% | 33.8% | 33.8% |
| Divorced | 12.6% | 12.3% | 10.8% |
| Widowed | 6.1% | 5.4% | 5.6% |
| space5 | | | |
| Household Size | 2.50 | 2.60 | 2.60 |
| Households | 4,337 | 67,662 | 124,010,992 |
| Family Households | 2,295 | 42,220 | 80,755,759 |
| Married couple, w/children | 41.6% | 32.1% | 30.5% |
| Married couple, no children | 35.7% | 41.8% | 42.9% |
| Non Family Households | 2,042 | 25,442 | 43,255,233 |
| Single householder, w/children | 13.6% | 15.4% | 15.8% |
| Single householder, no children | 9.0% | 10.7% | 10.8% |