| | Chester, CT | Fairfield, CT | United States |
| Population | 3,787 | 61,737 | 329,725,481 |
| Female Population | 49.7% | 51.8% | 50.5% |
| Male Population | 50.3% | 48.2% | 49.5% |
| Median Age | 49.5 | 40.4 | 38.4 |
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| Population - 2010 | 4,013 | 59,697 | 309,327,143 |
| Population - 2000 | 3,743 | 57,340 | 285,036,114 |
| Population - 1990 | 3,417 | 53,418 | 251,960,433 |
| Pop. 2000 to Now | 11.5% | 8.5% | 15.6% |
| Pop. 1990 to Now | 22.2% | 16.5% | 30.8% |
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| Population Density | 235.9 | 2,064.6 | 93.4 |
| Land Area | 16.1 | 29.9 | 3,531,905.4 |
| Water Area | 0.8 | 1.5 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Chester, CT | Fairfield, CT | United States |
| Age 0 to 4 | 3.7% | 5.7% | 5.9% |
| Age 5 to 9 | 5.1% | 5.7% | 6.1% |
| Age 10 to 14 | 3.2% | 7.0% | 6.6% |
| Age 15 to 17 | 4.5% | 4.8% | 3.9% |
| Age 18 to 20 | 3.5% | 7.8% | 4.0% |
| Age 21 to 24 | 4.4% | 5.5% | 5.2% |
| Age 25 to 34 | 10.5% | 7.8% | 13.8% |
| Age 35 to 44 | 8.3% | 11.0% | 12.9% |
| Age 45 to 54 | 15.5% | 13.9% | 12.6% |
| Age 55 to 59 | 7.9% | 8.4% | 6.7% |
| Age 60 to 64 | 6.7% | 6.8% | 6.3% |
| Age 65 to 74 | 15.7% | 8.0% | 9.6% |
| Age 75 to 84 | 7.7% | 4.4% | 4.5% |
| Age 85 and over | 3.3% | 3.2% | 1.9% |
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| Race | | | |
| | Chester, CT | Fairfield, CT | United States |
| White | 89.2% | 84.1% | 59.4% |
| Black | 1.4% | 2.0% | 12.2% |
| Asian | 0.9% | 4.2% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.5% | 0.4% |
| Two or More Races | 3.7% | 2.1% | 3.2% |
| Hispanic | 4.8% | 7.2% | 18.4% |
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| Marriage & Family | | | |
| | Chester, CT | Fairfield, CT | United States |
| Married Population | 45.7% | 53.0% | 49.8% |
| Currently Married | 45.7% | 52.3% | 48.0% |
| Married but Separated | 0.0% | 0.7% | 1.8% |
| Single Population | 54.3% | 47.0% | 50.2% |
| Never Married | 30.4% | 33.3% | 33.8% |
| Divorced | 15.6% | 8.8% | 10.8% |
| Widowed | 8.3% | 4.9% | 5.6% |
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| Household Size | 2.35 | 2.71 | 2.60 |
| Households | 1,548 | 21,086 | 124,010,992 |
| Family Households | 939 | 15,530 | 80,755,759 |
| Married couple, w/children | 26.0% | 39.5% | 30.5% |
| Married couple, no children | 53.2% | 42.8% | 42.9% |
| Non Family Households | 609 | 5,556 | 43,255,233 |
| Single householder, w/children | 11.3% | 8.7% | 15.8% |
| Single householder, no children | 9.5% | 9.0% | 10.8% |