| | San Simon, AZ | Avondale, AZ | United States |
| Population | 191 | 88,065 | 329,725,481 |
| Female Population | 44.0% | 50.9% | 50.5% |
| Male Population | 56.0% | 49.1% | 49.5% |
| Median Age | 66.6 | 31.2 | 38.4 |
| space3 | | | |
| Population - 2010 | 172 | 76,166 | 309,327,143 |
| Population - 2000 | 189 | 35,883 | 285,036,114 |
| Population - 1990 | 165 | 16,169 | 251,960,433 |
| Pop. 2000 to Now | -29.6% | 147.8% | 15.6% |
| Pop. 1990 to Now | -19.4% | 449.9% | 30.8% |
| space4 | | | |
| Population Density | 272.9 | 1,946.2 | 93.4 |
| Land Area | 0.7 | 45.2 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | San Simon, AZ | Avondale, AZ | United States |
| Age 0 to 4 | 0.0% | 7.9% | 5.9% |
| Age 5 to 9 | 0.0% | 8.1% | 6.1% |
| Age 10 to 14 | 4.7% | 7.5% | 6.6% |
| Age 15 to 17 | 0.0% | 4.9% | 3.9% |
| Age 18 to 20 | 0.5% | 4.9% | 4.0% |
| Age 21 to 24 | 15.2% | 6.1% | 5.2% |
| Age 25 to 34 | 4.2% | 16.5% | 13.8% |
| Age 35 to 44 | 4.7% | 13.4% | 12.9% |
| Age 45 to 54 | 7.9% | 12.3% | 12.6% |
| Age 55 to 59 | 3.1% | 4.8% | 6.7% |
| Age 60 to 64 | 7.3% | 5.2% | 6.3% |
| Age 65 to 74 | 27.7% | 5.5% | 9.6% |
| Age 75 to 84 | 19.9% | 2.2% | 4.5% |
| Age 85 and over | 4.7% | 0.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | San Simon, AZ | Avondale, AZ | United States |
| White | 66.5% | 26.5% | 59.4% |
| Black | 0.0% | 9.4% | 12.2% |
| Asian | 0.0% | 2.8% | 5.6% |
| Native American | 1.6% | 1.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.4% | 0.2% |
| Other | 0.0% | 0.2% | 0.4% |
| Two or More Races | 0.0% | 3.1% | 3.2% |
| Hispanic | 31.9% | 56.3% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | San Simon, AZ | Avondale, AZ | United States |
| Married Population | 40.1% | 47.2% | 49.8% |
| Currently Married | 40.1% | 45.1% | 48.0% |
| Married but Separated | 0.0% | 2.1% | 1.8% |
| Single Population | 59.9% | 52.8% | 50.2% |
| Never Married | 22.0% | 37.8% | 33.8% |
| Divorced | 15.9% | 11.3% | 10.8% |
| Widowed | 22.0% | 3.8% | 5.6% |
| space5 | | | |
| Household Size | 1.84 | 3.14 | 2.60 |
| Households | 104 | 27,995 | 124,010,992 |
| Family Households | 59 | 20,823 | 80,755,759 |
| Married couple, w/children | 0.0% | 34.7% | 30.5% |
| Married couple, no children | 64.4% | 29.8% | 42.9% |
| Non Family Households | 45 | 7,172 | 43,255,233 |
| Single householder, w/children | 13.6% | 24.0% | 15.8% |
| Single householder, no children | 22.0% | 11.5% | 10.8% |