| | Surprise, AZ | West Chester, PA | United States |
| Population | 141,875 | 18,592 | 329,725,481 |
| Female Population | 52.3% | 52.4% | 50.5% |
| Male Population | 47.7% | 47.6% | 49.5% |
| Median Age | 41.7 | 24.6 | 38.4 |
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| Population - 2010 | 117,604 | 18,472 | 309,327,143 |
| Population - 2000 | 30,848 | 17,861 | 285,036,114 |
| Population - 1990 | 7,122 | 18,041 | 251,960,433 |
| Pop. 2000 to Now | 379.7% | 12.2% | 15.6% |
| Pop. 1990 to Now | 1,977.6% | 11.1% | 30.8% |
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| Population Density | 1,311.6 | 10,071.5 | 93.4 |
| Land Area | 108.2 | 1.8 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Surprise, AZ | West Chester, PA | United States |
| Age 0 to 4 | 5.3% | 2.9% | 5.9% |
| Age 5 to 9 | 6.7% | 2.6% | 6.1% |
| Age 10 to 14 | 7.8% | 2.7% | 6.6% |
| Age 15 to 17 | 4.7% | 2.1% | 3.9% |
| Age 18 to 20 | 3.3% | 24.7% | 4.0% |
| Age 21 to 24 | 3.8% | 16.5% | 5.2% |
| Age 25 to 34 | 10.3% | 18.8% | 13.8% |
| Age 35 to 44 | 12.4% | 7.6% | 12.9% |
| Age 45 to 54 | 12.9% | 7.3% | 12.6% |
| Age 55 to 59 | 4.9% | 3.4% | 6.7% |
| Age 60 to 64 | 5.1% | 2.7% | 6.3% |
| Age 65 to 74 | 11.9% | 5.8% | 9.6% |
| Age 75 to 84 | 8.4% | 1.9% | 4.5% |
| Age 85 and over | 2.5% | 0.9% | 1.9% |
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| Race | | | |
| | Surprise, AZ | West Chester, PA | United States |
| White | 67.8% | 71.5% | 59.4% |
| Black | 5.0% | 12.1% | 12.2% |
| Asian | 2.3% | 1.7% | 5.6% |
| Native American | 0.3% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.1% | 0.0% | 0.2% |
| Other | 0.5% | 0.1% | 0.4% |
| Two or More Races | 3.2% | 2.4% | 3.2% |
| Hispanic | 20.7% | 12.4% | 18.4% |
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| Marriage & Family | | | |
| | Surprise, AZ | West Chester, PA | United States |
| Married Population | 59.5% | 21.1% | 49.8% |
| Currently Married | 58.5% | 19.6% | 48.0% |
| Married but Separated | 1.0% | 1.5% | 1.8% |
| Single Population | 40.5% | 78.9% | 50.2% |
| Never Married | 25.1% | 67.4% | 33.8% |
| Divorced | 9.9% | 8.1% | 10.8% |
| Widowed | 5.4% | 3.4% | 5.6% |
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| Household Size | 2.71 | 2.18 | 2.60 |
| Households | 52,205 | 6,832 | 124,010,992 |
| Family Households | 39,491 | 2,394 | 80,755,759 |
| Married couple, w/children | 31.6% | 22.3% | 30.5% |
| Married couple, no children | 49.1% | 40.8% | 42.9% |
| Non Family Households | 12,714 | 4,438 | 43,255,233 |
| Single householder, w/children | 12.0% | 20.0% | 15.8% |
| Single householder, no children | 7.2% | 17.0% | 10.8% |