| | Rancho Santa Fe, CA | Johns Creek, GA | United States |
| Population | 2,914 | 82,068 | 329,725,481 |
| Female Population | 54.2% | 50.4% | 50.5% |
| Male Population | 45.9% | 49.6% | 49.5% |
| Median Age | 48 | 42 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,865 | 77,091 | 309,327,143 |
| Population - 2000 | 3,252 | 61,958 | 285,036,114 |
| Population - 1990 | 3,066 | 18,830 | 251,960,433 |
| Pop. 2000 to Now | -24.2% | 37.5% | 15.6% |
| Pop. 1990 to Now | -19.6% | 352.4% | 30.8% |
| space4 | | | |
| Population Density | 434.0 | 2,663.4 | 93.4 |
| Land Area | 6.7 | 30.8 | 3,531,905.4 |
| Water Area | 0.1 | 0.5 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Rancho Santa Fe, CA | Johns Creek, GA | United States |
| Age 0 to 4 | 5.6% | 4.3% | 5.9% |
| Age 5 to 9 | 6.7% | 7.5% | 6.1% |
| Age 10 to 14 | 4.3% | 8.5% | 6.6% |
| Age 15 to 17 | 4.1% | 6.0% | 3.9% |
| Age 18 to 20 | 4.8% | 3.7% | 4.0% |
| Age 21 to 24 | 1.5% | 2.8% | 5.2% |
| Age 25 to 34 | 4.4% | 7.6% | 13.8% |
| Age 35 to 44 | 12.7% | 15.1% | 12.9% |
| Age 45 to 54 | 15.3% | 18.5% | 12.6% |
| Age 55 to 59 | 8.5% | 7.6% | 6.7% |
| Age 60 to 64 | 4.9% | 6.9% | 6.3% |
| Age 65 to 74 | 19.5% | 7.5% | 9.6% |
| Age 75 to 84 | 4.8% | 2.8% | 4.5% |
| Age 85 and over | 2.8% | 1.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Rancho Santa Fe, CA | Johns Creek, GA | United States |
| White | 75.2% | 52.7% | 59.4% |
| Black | 0.0% | 9.6% | 12.2% |
| Asian | 1.6% | 26.2% | 5.6% |
| Native American | 0.0% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 1.8% | 0.4% |
| Two or More Races | 7.3% | 2.6% | 3.2% |
| Hispanic | 15.9% | 6.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Rancho Santa Fe, CA | Johns Creek, GA | United States |
| Married Population | 61.7% | 64.8% | 49.8% |
| Currently Married | 61.7% | 64.4% | 48.0% |
| Married but Separated | 0.0% | 0.4% | 1.8% |
| Single Population | 38.3% | 35.2% | 50.2% |
| Never Married | 23.2% | 22.8% | 33.8% |
| Divorced | 8.2% | 8.5% | 10.8% |
| Widowed | 6.9% | 4.0% | 5.6% |
| space5 | | | |
| Household Size | 2.96 | 2.86 | 2.60 |
| Households | 984 | 28,641 | 124,010,992 |
| Family Households | 821 | 22,935 | 80,755,759 |
| Married couple, w/children | 27.0% | 44.4% | 30.5% |
| Married couple, no children | 60.0% | 42.2% | 42.9% |
| Non Family Households | 163 | 5,706 | 43,255,233 |
| Single householder, w/children | 10.4% | 9.0% | 15.8% |
| Single householder, no children | 2.6% | 4.4% | 10.8% |