| | Monte Rio, CA | Windsor, CA | United States |
| Population | 864 | 26,548 | 329,725,481 |
| Female Population | 40.7% | 50.7% | 50.5% |
| Male Population | 59.3% | 49.3% | 49.5% |
| Median Age | 61.2 | 41.6 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,030 | 26,810 | 309,327,143 |
| Population - 2000 | 1,104 | 22,744 | 285,036,114 |
| Population - 1990 | 1,058 | 13,371 | 251,960,433 |
| Pop. 2000 to Now | -10.6% | 20.1% | 15.6% |
| Pop. 1990 to Now | -6.7% | 104.3% | 30.8% |
| space4 | | | |
| Population Density | 453.8 | 3,651.7 | 93.4 |
| Land Area | 1.9 | 7.3 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Monte Rio, CA | Windsor, CA | United States |
| Age 0 to 4 | 0.9% | 4.2% | 5.9% |
| Age 5 to 9 | 3.8% | 7.1% | 6.1% |
| Age 10 to 14 | 6.6% | 6.9% | 6.6% |
| Age 15 to 17 | 0.0% | 5.7% | 3.9% |
| Age 18 to 20 | 1.0% | 4.0% | 4.0% |
| Age 21 to 24 | 1.4% | 4.6% | 5.2% |
| Age 25 to 34 | 8.1% | 9.6% | 13.8% |
| Age 35 to 44 | 5.3% | 13.7% | 12.9% |
| Age 45 to 54 | 9.0% | 15.0% | 12.6% |
| Age 55 to 59 | 13.1% | 7.3% | 6.7% |
| Age 60 to 64 | 14.9% | 6.9% | 6.3% |
| Age 65 to 74 | 27.7% | 9.3% | 9.6% |
| Age 75 to 84 | 0.7% | 3.9% | 4.5% |
| Age 85 and over | 7.4% | 1.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Monte Rio, CA | Windsor, CA | United States |
| White | 86.8% | 59.6% | 59.4% |
| Black | 0.0% | 0.9% | 12.2% |
| Asian | 1.7% | 2.9% | 5.6% |
| Native American | 0.0% | 1.4% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.4% | 0.2% |
| Other | 0.8% | 0.5% | 0.4% |
| Two or More Races | 2.1% | 3.2% | 3.2% |
| Hispanic | 8.6% | 31.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Monte Rio, CA | Windsor, CA | United States |
| Married Population | 34.6% | 54.6% | 49.8% |
| Currently Married | 32.4% | 53.4% | 48.0% |
| Married but Separated | 2.2% | 1.1% | 1.8% |
| Single Population | 65.4% | 45.4% | 50.2% |
| Never Married | 29.5% | 30.2% | 33.8% |
| Divorced | 23.8% | 11.1% | 10.8% |
| Widowed | 12.1% | 4.1% | 5.6% |
| space5 | | | |
| Household Size | 1.82 | 2.89 | 2.60 |
| Households | 475 | 9,163 | 124,010,992 |
| Family Households | 211 | 6,928 | 80,755,759 |
| Married couple, w/children | 8.5% | 38.4% | 30.5% |
| Married couple, no children | 47.9% | 41.2% | 42.9% |
| Non Family Households | 264 | 2,235 | 43,255,233 |
| Single householder, w/children | 16.1% | 12.6% | 15.8% |
| Single householder, no children | 27.5% | 7.8% | 10.8% |