| | Litchfield, CT | Palatine, IL | United States |
| Population | 8,161 | 67,754 | 329,725,481 |
| Female Population | 51.6% | 51.9% | 50.5% |
| Male Population | 48.4% | 48.1% | 49.5% |
| Median Age | 53.1 | 38.2 | 38.4 |
| space3 | | | |
| Population - 2010 | 8,452 | 68,610 | 309,327,143 |
| Population - 2000 | 8,316 | 65,479 | 285,036,114 |
| Population - 1990 | 8,365 | 39,253 | 251,960,433 |
| Pop. 2000 to Now | -3.0% | 2.1% | 15.6% |
| Pop. 1990 to Now | -3.5% | 70.3% | 30.8% |
| space4 | | | |
| Population Density | 145.5 | 4,975.3 | 93.4 |
| Land Area | 56.1 | 13.6 | 3,531,905.4 |
| Water Area | 0.7 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Litchfield, CT | Palatine, IL | United States |
| Age 0 to 4 | 3.4% | 7.1% | 5.9% |
| Age 5 to 9 | 4.4% | 6.7% | 6.1% |
| Age 10 to 14 | 5.1% | 6.3% | 6.6% |
| Age 15 to 17 | 2.7% | 3.8% | 3.9% |
| Age 18 to 20 | 3.4% | 2.4% | 4.0% |
| Age 21 to 24 | 3.8% | 4.0% | 5.2% |
| Age 25 to 34 | 9.8% | 15.4% | 13.8% |
| Age 35 to 44 | 8.6% | 12.7% | 12.9% |
| Age 45 to 54 | 11.8% | 13.4% | 12.6% |
| Age 55 to 59 | 8.7% | 6.4% | 6.7% |
| Age 60 to 64 | 11.2% | 7.6% | 6.3% |
| Age 65 to 74 | 14.6% | 8.8% | 9.6% |
| Age 75 to 84 | 7.2% | 4.0% | 4.5% |
| Age 85 and over | 5.3% | 1.3% | 1.9% |
| space1 | | | |
| Race | | | |
| | Litchfield, CT | Palatine, IL | United States |
| White | 87.0% | 61.8% | 59.4% |
| Black | 2.1% | 4.0% | 12.2% |
| Asian | 2.4% | 12.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 0.7% | 0.1% | 0.4% |
| Two or More Races | 3.8% | 2.2% | 3.2% |
| Hispanic | 4.1% | 19.8% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Litchfield, CT | Palatine, IL | United States |
| Married Population | 56.6% | 53.3% | 49.8% |
| Currently Married | 55.9% | 51.7% | 48.0% |
| Married but Separated | 0.7% | 1.6% | 1.8% |
| Single Population | 43.4% | 46.7% | 50.2% |
| Never Married | 24.4% | 31.4% | 33.8% |
| Divorced | 11.4% | 10.8% | 10.8% |
| Widowed | 7.6% | 4.5% | 5.6% |
| space5 | | | |
| Household Size | 2.37 | 2.54 | 2.60 |
| Households | 3,332 | 26,609 | 124,010,992 |
| Family Households | 2,181 | 17,397 | 80,755,759 |
| Married couple, w/children | 23.0% | 29.9% | 30.5% |
| Married couple, no children | 61.4% | 43.6% | 42.9% |
| Non Family Households | 1,151 | 9,212 | 43,255,233 |
| Single householder, w/children | 9.3% | 16.7% | 15.8% |
| Single householder, no children | 6.3% | 9.7% | 10.8% |