| | Castle Pines, CO | Hardeeville, SC | United States |
| Population | 11,296 | 7,228 | 329,725,481 |
| Female Population | 49.8% | 49.7% | 50.5% |
| Male Population | 50.2% | 50.3% | 49.5% |
| Median Age | 43.2 | 59.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 10,368 | 3,095 | 309,327,143 |
| Population - 2000 | 5,958 | 1,793 | 285,036,114 |
| Population - 1990 | 554 | 1,583 | 251,960,433 |
| Pop. 2000 to Now | 95.8% | 371.3% | 15.6% |
| Pop. 1990 to Now | 2,005.4% | 433.9% | 30.8% |
| space4 | | | |
| Population Density | 1,177.4 | 128.8 | 93.4 |
| Land Area | 9.6 | 56.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Castle Pines, CO | Hardeeville, SC | United States |
| Age 0 to 4 | 3.7% | 3.7% | 5.9% |
| Age 5 to 9 | 5.9% | 2.7% | 6.1% |
| Age 10 to 14 | 8.5% | 1.0% | 6.6% |
| Age 15 to 17 | 6.1% | 1.6% | 3.9% |
| Age 18 to 20 | 4.2% | 0.1% | 4.0% |
| Age 21 to 24 | 4.6% | 1.9% | 5.2% |
| Age 25 to 34 | 7.6% | 13.7% | 13.8% |
| Age 35 to 44 | 12.6% | 6.0% | 12.9% |
| Age 45 to 54 | 19.1% | 8.9% | 12.6% |
| Age 55 to 59 | 9.3% | 10.7% | 6.7% |
| Age 60 to 64 | 4.5% | 10.1% | 6.3% |
| Age 65 to 74 | 8.9% | 28.0% | 9.6% |
| Age 75 to 84 | 3.3% | 9.7% | 4.5% |
| Age 85 and over | 1.7% | 2.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Castle Pines, CO | Hardeeville, SC | United States |
| White | 82.4% | 65.0% | 59.4% |
| Black | 4.2% | 13.4% | 12.2% |
| Asian | 5.3% | 0.3% | 5.6% |
| Native American | 0.2% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.5% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 2.3% | 0.9% | 3.2% |
| Hispanic | 5.0% | 20.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Castle Pines, CO | Hardeeville, SC | United States |
| Married Population | 65.8% | 67.1% | 49.8% |
| Currently Married | 65.0% | 63.5% | 48.0% |
| Married but Separated | 0.8% | 3.6% | 1.8% |
| Single Population | 34.2% | 32.9% | 50.2% |
| Never Married | 24.5% | 14.3% | 33.8% |
| Divorced | 7.4% | 10.5% | 10.8% |
| Widowed | 2.3% | 8.2% | 5.6% |
| space5 | | | |
| Household Size | 3.01 | 2.02 | 2.60 |
| Households | 3,747 | 3,576 | 124,010,992 |
| Family Households | 3,269 | 2,394 | 80,755,759 |
| Married couple, w/children | 45.0% | 9.0% | 30.5% |
| Married couple, no children | 46.2% | 79.1% | 42.9% |
| Non Family Households | 478 | 1,182 | 43,255,233 |
| Single householder, w/children | 4.6% | 4.2% | 15.8% |
| Single householder, no children | 4.3% | 7.6% | 10.8% |