| | Kemah, TX | Harleysville, PA | United States |
| Population | 1,878 | 9,219 | 329,725,481 |
| Female Population | 48.9% | 50.6% | 50.5% |
| Male Population | 51.1% | 49.4% | 49.5% |
| Median Age | 42.5 | 48 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,791 | 9,464 | 309,327,143 |
| Population - 2000 | 2,330 | 8,795 | 285,036,114 |
| Population - 1990 | 1,094 | 7,405 | 251,960,433 |
| Pop. 2000 to Now | -12.1% | 12.2% | 15.6% |
| Pop. 1990 to Now | 87.2% | 33.3% | 30.8% |
| space4 | | | |
| Population Density | 1,020.7 | 2,208.1 | 93.4 |
| Land Area | 1.8 | 4.2 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Kemah, TX | Harleysville, PA | United States |
| Age 0 to 4 | 3.1% | 3.9% | 5.9% |
| Age 5 to 9 | 5.3% | 3.2% | 6.1% |
| Age 10 to 14 | 5.6% | 5.1% | 6.6% |
| Age 15 to 17 | 7.9% | 4.2% | 3.9% |
| Age 18 to 20 | 4.9% | 2.0% | 4.0% |
| Age 21 to 24 | 2.6% | 4.1% | 5.2% |
| Age 25 to 34 | 12.6% | 12.9% | 13.8% |
| Age 35 to 44 | 11.6% | 10.3% | 12.9% |
| Age 45 to 54 | 17.2% | 13.7% | 12.6% |
| Age 55 to 59 | 9.8% | 9.9% | 6.7% |
| Age 60 to 64 | 6.0% | 6.6% | 6.3% |
| Age 65 to 74 | 9.9% | 10.2% | 9.6% |
| Age 75 to 84 | 1.7% | 4.9% | 4.5% |
| Age 85 and over | 2.0% | 8.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Kemah, TX | Harleysville, PA | United States |
| White | 58.4% | 84.6% | 59.4% |
| Black | 7.6% | 5.0% | 12.2% |
| Asian | 4.2% | 4.3% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.4% | 0.0% | 0.4% |
| Two or More Races | 4.6% | 2.4% | 3.2% |
| Hispanic | 24.8% | 3.7% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Kemah, TX | Harleysville, PA | United States |
| Married Population | 50.3% | 58.3% | 49.8% |
| Currently Married | 48.1% | 58.0% | 48.0% |
| Married but Separated | 2.2% | 0.3% | 1.8% |
| Single Population | 49.7% | 41.7% | 50.2% |
| Never Married | 33.5% | 24.7% | 33.8% |
| Divorced | 12.9% | 7.5% | 10.8% |
| Widowed | 3.3% | 9.5% | 5.6% |
| space5 | | | |
| Household Size | 2.49 | 2.44 | 2.60 |
| Households | 754 | 3,711 | 124,010,992 |
| Family Households | 520 | 2,649 | 80,755,759 |
| Married couple, w/children | 22.9% | 28.8% | 30.5% |
| Married couple, no children | 48.7% | 56.7% | 42.9% |
| Non Family Households | 234 | 1,062 | 43,255,233 |
| Single householder, w/children | 21.9% | 2.9% | 15.8% |
| Single householder, no children | 6.5% | 11.6% | 10.8% |