| | Interlachen, FL | Eureka Springs, AR | United States |
| Population | 1,646 | 2,159 | 329,725,481 |
| Female Population | 48.4% | 53.2% | 50.5% |
| Male Population | 51.6% | 46.8% | 49.5% |
| Median Age | 48.8 | 52.2 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,469 | 2,070 | 309,327,143 |
| Population - 2000 | 1,475 | 2,278 | 285,036,114 |
| Population - 1990 | 1,160 | 1,900 | 251,960,433 |
| Pop. 2000 to Now | 0.1% | -8.5% | 15.6% |
| Pop. 1990 to Now | 27.3% | 9.7% | 30.8% |
| space4 | | | |
| Population Density | 275.9 | 319.5 | 93.4 |
| Land Area | 6.0 | 6.8 | 3,531,905.4 |
| Water Area | 0.5 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Interlachen, FL | Eureka Springs, AR | United States |
| Age 0 to 4 | 4.3% | 3.7% | 5.9% |
| Age 5 to 9 | 4.1% | 5.2% | 6.1% |
| Age 10 to 14 | 4.3% | 5.2% | 6.6% |
| Age 15 to 17 | 7.2% | 3.9% | 3.9% |
| Age 18 to 20 | 3.6% | 3.4% | 4.0% |
| Age 21 to 24 | 4.7% | 1.3% | 5.2% |
| Age 25 to 34 | 9.7% | 9.7% | 13.8% |
| Age 35 to 44 | 6.0% | 7.5% | 12.9% |
| Age 45 to 54 | 15.2% | 15.2% | 12.6% |
| Age 55 to 59 | 12.8% | 8.0% | 6.7% |
| Age 60 to 64 | 7.5% | 13.0% | 6.3% |
| Age 65 to 74 | 9.7% | 15.7% | 9.6% |
| Age 75 to 84 | 7.9% | 4.8% | 4.5% |
| Age 85 and over | 3.0% | 3.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Interlachen, FL | Eureka Springs, AR | United States |
| White | 62.3% | 84.3% | 59.4% |
| Black | 7.4% | 0.0% | 12.2% |
| Asian | 0.0% | 1.0% | 5.6% |
| Native American | 0.2% | 3.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.2% | 0.1% | 0.4% |
| Two or More Races | 2.2% | 5.2% | 3.2% |
| Hispanic | 27.8% | 6.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Interlachen, FL | Eureka Springs, AR | United States |
| Married Population | 42.1% | 44.7% | 49.8% |
| Currently Married | 38.5% | 42.6% | 48.0% |
| Married but Separated | 3.7% | 2.2% | 1.8% |
| Single Population | 57.9% | 55.3% | 50.2% |
| Never Married | 32.3% | 26.5% | 33.8% |
| Divorced | 18.8% | 21.0% | 10.8% |
| Widowed | 6.7% | 7.7% | 5.6% |
| space5 | | | |
| Household Size | 2.65 | 2.21 | 2.60 |
| Households | 622 | 954 | 124,010,992 |
| Family Households | 440 | 492 | 80,755,759 |
| Married couple, w/children | 15.9% | 11.6% | 30.5% |
| Married couple, no children | 46.6% | 64.6% | 42.9% |
| Non Family Households | 182 | 462 | 43,255,233 |
| Single householder, w/children | 19.1% | 9.8% | 15.8% |
| Single householder, no children | 18.4% | 14.0% | 10.8% |