| | Summerland, CA | Carpinteria, CA | United States |
| Population | 582 | 13,289 | 329,725,481 |
| Female Population | 48.1% | 49.2% | 50.5% |
| Male Population | 51.9% | 50.8% | 49.5% |
| Median Age | 68.2 | 40.6 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,083 | 12,996 | 309,327,143 |
| Population - 2000 | 1,545 | 14,194 | 285,036,114 |
| Population - 1990 | 1,400 | 13,747 | 251,960,433 |
| Pop. 2000 to Now | -27.8% | -6.8% | 15.6% |
| Pop. 1990 to Now | -20.4% | -3.8% | 30.8% |
| space4 | | | |
| Population Density | 293.5 | 5,134.9 | 93.4 |
| Land Area | 2.0 | 2.6 | 3,531,905.4 |
| Water Area | 0.0 | 6.7 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Summerland, CA | Carpinteria, CA | United States |
| Age 0 to 4 | 0.0% | 5.7% | 5.9% |
| Age 5 to 9 | 0.0% | 7.2% | 6.1% |
| Age 10 to 14 | 5.3% | 6.6% | 6.6% |
| Age 15 to 17 | 0.0% | 2.5% | 3.9% |
| Age 18 to 20 | 0.0% | 3.3% | 4.0% |
| Age 21 to 24 | 0.0% | 4.3% | 5.2% |
| Age 25 to 34 | 0.0% | 11.3% | 13.8% |
| Age 35 to 44 | 0.0% | 13.5% | 12.9% |
| Age 45 to 54 | 13.4% | 10.1% | 12.6% |
| Age 55 to 59 | 11.5% | 6.8% | 6.7% |
| Age 60 to 64 | 16.7% | 7.9% | 6.3% |
| Age 65 to 74 | 33.8% | 14.6% | 9.6% |
| Age 75 to 84 | 15.5% | 4.4% | 4.5% |
| Age 85 and over | 3.8% | 1.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Summerland, CA | Carpinteria, CA | United States |
| White | 100.0% | 47.8% | 59.4% |
| Black | 0.0% | 0.7% | 12.2% |
| Asian | 0.0% | 2.1% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.3% | 0.4% |
| Two or More Races | 0.0% | 3.3% | 3.2% |
| Hispanic | 0.0% | 45.7% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Summerland, CA | Carpinteria, CA | United States |
| Married Population | 67.7% | 56.4% | 49.8% |
| Currently Married | 67.7% | 54.4% | 48.0% |
| Married but Separated | 0.0% | 2.0% | 1.8% |
| Single Population | 32.3% | 43.6% | 50.2% |
| Never Married | 10.2% | 26.0% | 33.8% |
| Divorced | 10.9% | 12.2% | 10.8% |
| Widowed | 11.3% | 5.4% | 5.6% |
| space5 | | | |
| Household Size | 1.66 | 2.67 | 2.60 |
| Households | 351 | 4,958 | 124,010,992 |
| Family Households | 198 | 3,173 | 80,755,759 |
| Married couple, w/children | 17.7% | 35.7% | 30.5% |
| Married couple, no children | 76.3% | 46.9% | 42.9% |
| Non Family Households | 153 | 1,785 | 43,255,233 |
| Single householder, w/children | 0.0% | 10.4% | 15.8% |
| Single householder, no children | 6.1% | 7.0% | 10.8% |