| | Fulton, CA | Guerneville, CA | United States |
| Population | 457 | 4,879 | 329,725,481 |
| Female Population | 39.2% | 44.2% | 50.5% |
| Male Population | 60.8% | 55.8% | 49.5% |
| Median Age | 40 | 52.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 596 | 4,476 | 309,327,143 |
| Population - 2000 | 310 | 2,441 | 285,036,114 |
| Population - 1990 | 237 | 1,966 | 251,960,433 |
| Pop. 2000 to Now | 55.5% | 83.2% | 15.6% |
| Pop. 1990 to Now | 103.4% | 127.5% | 30.8% |
| space4 | | | |
| Population Density | 234.5 | 502.5 | 93.4 |
| Land Area | 1.9 | 9.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.2 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Fulton, CA | Guerneville, CA | United States |
| Age 0 to 4 | 6.8% | 1.7% | 5.9% |
| Age 5 to 9 | 7.2% | 2.6% | 6.1% |
| Age 10 to 14 | 14.4% | 2.4% | 6.6% |
| Age 15 to 17 | 0.0% | 3.2% | 3.9% |
| Age 18 to 20 | 0.0% | 2.2% | 4.0% |
| Age 21 to 24 | 0.0% | 2.7% | 5.2% |
| Age 25 to 34 | 0.0% | 14.1% | 13.8% |
| Age 35 to 44 | 21.7% | 10.7% | 12.9% |
| Age 45 to 54 | 0.0% | 15.9% | 12.6% |
| Age 55 to 59 | 24.7% | 7.4% | 6.7% |
| Age 60 to 64 | 0.0% | 9.1% | 6.3% |
| Age 65 to 74 | 4.2% | 20.9% | 9.6% |
| Age 75 to 84 | 21.0% | 4.9% | 4.5% |
| Age 85 and over | 0.0% | 2.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Fulton, CA | Guerneville, CA | United States |
| White | 28.7% | 76.6% | 59.4% |
| Black | 0.0% | 0.7% | 12.2% |
| Asian | 0.0% | 1.4% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.4% | 0.4% |
| Two or More Races | 0.0% | 4.0% | 3.2% |
| Hispanic | 71.3% | 16.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Fulton, CA | Guerneville, CA | United States |
| Married Population | 17.4% | 42.2% | 49.8% |
| Currently Married | 17.4% | 39.8% | 48.0% |
| Married but Separated | 0.0% | 2.3% | 1.8% |
| Single Population | 82.6% | 57.9% | 50.2% |
| Never Married | 34.6% | 35.1% | 33.8% |
| Divorced | 27.8% | 17.4% | 10.8% |
| Widowed | 20.2% | 5.4% | 5.6% |
| space5 | | | |
| Household Size | 3.41 | 2.02 | 2.60 |
| Households | 134 | 2,418 | 124,010,992 |
| Family Households | 91 | 1,044 | 80,755,759 |
| Married couple, w/children | 19.8% | 14.6% | 30.5% |
| Married couple, no children | 9.9% | 63.0% | 42.9% |
| Non Family Households | 43 | 1,374 | 43,255,233 |
| Single householder, w/children | 31.9% | 15.2% | 15.8% |
| Single householder, no children | 38.5% | 7.2% | 10.8% |