| | Newcastle, UT | Apple Valley, CA | United States |
| Population | 254 | 75,311 | 329,725,481 |
| Female Population | 55.1% | 51.7% | 50.5% |
| Male Population | 44.9% | 48.3% | 49.5% |
| Median Age | 61 | 36.8 | 38.4 |
| space3 | | | |
| Population - 2010 | 133 | 69,310 | 309,327,143 |
| Population - 2000 | 169 | 54,239 | 285,036,114 |
| Population - 1990 | 101 | 46,079 | 251,960,433 |
| Pop. 2000 to Now | 98.8% | 36.6% | 15.6% |
| Pop. 1990 to Now | 232.7% | 60.7% | 30.8% |
| space4 | | | |
| Population Density | 63.9 | 1,005.2 | 93.4 |
| Land Area | 4.0 | 74.9 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Newcastle, UT | Apple Valley, CA | United States |
| Age 0 to 4 | 0.0% | 8.3% | 5.9% |
| Age 5 to 9 | 0.0% | 7.5% | 6.1% |
| Age 10 to 14 | 0.0% | 7.5% | 6.6% |
| Age 15 to 17 | 0.0% | 5.4% | 3.9% |
| Age 18 to 20 | 0.0% | 3.6% | 4.0% |
| Age 21 to 24 | 0.0% | 4.0% | 5.2% |
| Age 25 to 34 | 3.2% | 11.5% | 13.8% |
| Age 35 to 44 | 18.1% | 12.1% | 12.9% |
| Age 45 to 54 | 0.0% | 10.9% | 12.6% |
| Age 55 to 59 | 0.0% | 6.1% | 6.7% |
| Age 60 to 64 | 42.5% | 6.5% | 6.3% |
| Age 65 to 74 | 36.2% | 9.8% | 9.6% |
| Age 75 to 84 | 0.0% | 4.8% | 4.5% |
| Age 85 and over | 0.0% | 1.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Newcastle, UT | Apple Valley, CA | United States |
| White | 100.0% | 45.3% | 59.4% |
| Black | 0.0% | 6.7% | 12.2% |
| Asian | 0.0% | 3.1% | 5.6% |
| Native American | 0.0% | 0.4% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 0.0% | 0.2% | 0.4% |
| Two or More Races | 0.0% | 4.0% | 3.2% |
| Hispanic | 0.0% | 40.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Newcastle, UT | Apple Valley, CA | United States |
| Married Population | 46.1% | 52.6% | 49.8% |
| Currently Married | 46.1% | 50.9% | 48.0% |
| Married but Separated | 0.0% | 1.7% | 1.8% |
| Single Population | 53.9% | 47.4% | 50.2% |
| Never Married | 3.2% | 29.9% | 33.8% |
| Divorced | 50.8% | 12.2% | 10.8% |
| Widowed | 0.0% | 5.4% | 5.6% |
| space5 | | | |
| Household Size | 2.80 | 3.06 | 2.60 |
| Households | 88 | 24,427 | 124,010,992 |
| Family Households | 88 | 18,056 | 80,755,759 |
| Married couple, w/children | 0.0% | 32.6% | 30.5% |
| Married couple, no children | 59.1% | 40.8% | 42.9% |
| Non Family Households | 0 | 6,371 | 43,255,233 |
| Single householder, w/children | 0.0% | 16.8% | 15.8% |
| Single householder, no children | 40.9% | 9.8% | 10.8% |