| | Avon, CT | Allentown, PA | United States |
| Population | 18,821 | 125,250 | 329,725,481 |
| Female Population | 52.1% | 51.2% | 50.5% |
| Male Population | 47.9% | 48.8% | 49.5% |
| Median Age | 45.3 | 31.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 18,157 | 118,040 | 309,327,143 |
| Population - 2000 | 15,832 | 106,632 | 285,036,114 |
| Population - 1990 | 13,937 | 105,090 | 251,960,433 |
| Pop. 2000 to Now | 15.1% | 13.9% | 15.6% |
| Pop. 1990 to Now | 30.7% | 15.6% | 30.8% |
| space4 | | | |
| Population Density | 812.9 | 7,137.6 | 93.4 |
| Land Area | 23.2 | 17.5 | 3,531,905.4 |
| Water Area | 0.4 | 0.5 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Avon, CT | Allentown, PA | United States |
| Age 0 to 4 | 5.0% | 7.7% | 5.9% |
| Age 5 to 9 | 6.0% | 6.7% | 6.1% |
| Age 10 to 14 | 8.5% | 7.4% | 6.6% |
| Age 15 to 17 | 4.6% | 3.9% | 3.9% |
| Age 18 to 20 | 2.0% | 5.8% | 4.0% |
| Age 21 to 24 | 3.1% | 6.5% | 5.2% |
| Age 25 to 34 | 6.9% | 16.3% | 13.8% |
| Age 35 to 44 | 13.5% | 12.0% | 12.9% |
| Age 45 to 54 | 15.2% | 10.7% | 12.6% |
| Age 55 to 59 | 6.2% | 5.7% | 6.7% |
| Age 60 to 64 | 7.6% | 5.0% | 6.3% |
| Age 65 to 74 | 11.3% | 7.2% | 9.6% |
| Age 75 to 84 | 5.7% | 3.3% | 4.5% |
| Age 85 and over | 4.4% | 1.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Avon, CT | Allentown, PA | United States |
| White | 77.7% | 29.9% | 59.4% |
| Black | 0.9% | 10.3% | 12.2% |
| Asian | 14.2% | 3.0% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 1.0% | 0.3% | 0.4% |
| Two or More Races | 2.6% | 1.7% | 3.2% |
| Hispanic | 3.6% | 54.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Avon, CT | Allentown, PA | United States |
| Married Population | 66.4% | 38.5% | 49.8% |
| Currently Married | 65.5% | 34.6% | 48.0% |
| Married but Separated | 0.9% | 3.9% | 1.8% |
| Single Population | 33.6% | 61.5% | 50.2% |
| Never Married | 19.4% | 46.7% | 33.8% |
| Divorced | 7.9% | 9.8% | 10.8% |
| Widowed | 6.4% | 5.0% | 5.6% |
| space5 | | | |
| Household Size | 2.51 | 2.65 | 2.60 |
| Households | 7,398 | 45,195 | 124,010,992 |
| Family Households | 5,259 | 27,940 | 80,755,759 |
| Married couple, w/children | 40.6% | 25.0% | 30.5% |
| Married couple, no children | 49.9% | 28.9% | 42.9% |
| Non Family Households | 2,139 | 17,255 | 43,255,233 |
| Single householder, w/children | 6.2% | 31.5% | 15.8% |
| Single householder, no children | 3.3% | 14.6% | 10.8% |