| | San Tan Valley, AZ | Avondale, AZ | United States |
| Population | 96,127 | 88,065 | 329,725,481 |
| Female Population | 51.2% | 50.9% | 50.5% |
| Male Population | 48.8% | 49.1% | 49.5% |
| Median Age | 34.8 | 31.2 | 38.4 |
| space3 | | | |
| Population - 2010 | 64,085 | 76,166 | 309,327,143 |
| Population - 2000 | 2,676 | 35,883 | 285,036,114 |
| Population - 1990 | 1,262 | 16,169 | 251,960,433 |
| Pop. 2000 to Now | 3,913.3% | 147.8% | 15.6% |
| Pop. 1990 to Now | 8,410.0% | 449.9% | 30.8% |
| space4 | | | |
| Population Density | 2,621.3 | 1,946.2 | 93.4 |
| Land Area | 36.7 | 45.2 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | San Tan Valley, AZ | Avondale, AZ | United States |
| Age 0 to 4 | 6.9% | 7.9% | 5.9% |
| Age 5 to 9 | 8.7% | 8.1% | 6.1% |
| Age 10 to 14 | 8.7% | 7.5% | 6.6% |
| Age 15 to 17 | 5.0% | 4.9% | 3.9% |
| Age 18 to 20 | 3.5% | 4.9% | 4.0% |
| Age 21 to 24 | 4.7% | 6.1% | 5.2% |
| Age 25 to 34 | 13.0% | 16.5% | 13.8% |
| Age 35 to 44 | 15.8% | 13.4% | 12.9% |
| Age 45 to 54 | 11.7% | 12.3% | 12.6% |
| Age 55 to 59 | 5.1% | 4.8% | 6.7% |
| Age 60 to 64 | 5.2% | 5.2% | 6.3% |
| Age 65 to 74 | 8.7% | 5.5% | 9.6% |
| Age 75 to 84 | 2.5% | 2.2% | 4.5% |
| Age 85 and over | 0.6% | 0.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | San Tan Valley, AZ | Avondale, AZ | United States |
| White | 63.8% | 26.5% | 59.4% |
| Black | 2.5% | 9.4% | 12.2% |
| Asian | 1.9% | 2.8% | 5.6% |
| Native American | 1.9% | 1.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.2% | 0.4% | 0.2% |
| Other | 0.3% | 0.2% | 0.4% |
| Two or More Races | 3.6% | 3.1% | 3.2% |
| Hispanic | 25.8% | 56.3% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | San Tan Valley, AZ | Avondale, AZ | United States |
| Married Population | 59.2% | 47.2% | 49.8% |
| Currently Married | 58.0% | 45.1% | 48.0% |
| Married but Separated | 1.2% | 2.1% | 1.8% |
| Single Population | 40.8% | 52.8% | 50.2% |
| Never Married | 28.3% | 37.8% | 33.8% |
| Divorced | 9.2% | 11.3% | 10.8% |
| Widowed | 3.3% | 3.8% | 5.6% |
| space5 | | | |
| Household Size | 3.09 | 3.14 | 2.60 |
| Households | 31,091 | 27,995 | 124,010,992 |
| Family Households | 24,934 | 20,823 | 80,755,759 |
| Married couple, w/children | 41.8% | 34.7% | 30.5% |
| Married couple, no children | 38.4% | 29.8% | 42.9% |
| Non Family Households | 6,157 | 7,172 | 43,255,233 |
| Single householder, w/children | 13.2% | 24.0% | 15.8% |
| Single householder, no children | 6.6% | 11.5% | 10.8% |