| | Lancaster, NY | Lima, NY | United States |
| Population | 44,732 | 4,130 | 329,725,481 |
| Female Population | 50.7% | 48.7% | 50.5% |
| Male Population | 49.3% | 51.3% | 49.5% |
| Median Age | 45.9 | 39.2 | 38.4 |
| space3 | | | |
| Population - 2010 | 41,712 | 4,258 | 309,327,143 |
| Population - 2000 | 39,019 | 4,541 | 285,036,114 |
| Population - 1990 | 32,181 | 4,187 | 251,960,433 |
| Pop. 2000 to Now | 11.0% | -11.5% | 15.6% |
| Pop. 1990 to Now | 34.6% | -4.0% | 30.8% |
| space4 | | | |
| Population Density | 1,186.3 | 129.5 | 93.4 |
| Land Area | 37.7 | 31.9 | 3,531,905.4 |
| Water Area | 0.2 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Lancaster, NY | Lima, NY | United States |
| Age 0 to 4 | 4.9% | 4.8% | 5.9% |
| Age 5 to 9 | 5.3% | 6.6% | 6.1% |
| Age 10 to 14 | 5.1% | 5.0% | 6.6% |
| Age 15 to 17 | 3.0% | 4.5% | 3.9% |
| Age 18 to 20 | 3.1% | 9.0% | 4.0% |
| Age 21 to 24 | 4.8% | 5.1% | 5.2% |
| Age 25 to 34 | 12.1% | 8.8% | 13.8% |
| Age 35 to 44 | 10.9% | 13.6% | 12.9% |
| Age 45 to 54 | 13.4% | 12.8% | 12.6% |
| Age 55 to 59 | 8.9% | 8.8% | 6.7% |
| Age 60 to 64 | 8.9% | 8.3% | 6.3% |
| Age 65 to 74 | 11.6% | 8.6% | 9.6% |
| Age 75 to 84 | 5.7% | 3.1% | 4.5% |
| Age 85 and over | 2.4% | 1.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Lancaster, NY | Lima, NY | United States |
| White | 94.9% | 90.8% | 59.4% |
| Black | 1.8% | 0.4% | 12.2% |
| Asian | 0.7% | 1.6% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 1.7% | 0.4% |
| Two or More Races | 0.7% | 1.8% | 3.2% |
| Hispanic | 1.8% | 3.7% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Lancaster, NY | Lima, NY | United States |
| Married Population | 54.3% | 55.0% | 49.8% |
| Currently Married | 53.2% | 54.0% | 48.0% |
| Married but Separated | 1.1% | 1.0% | 1.8% |
| Single Population | 45.7% | 45.0% | 50.2% |
| Never Married | 27.8% | 31.9% | 33.8% |
| Divorced | 10.9% | 9.2% | 10.8% |
| Widowed | 7.0% | 4.0% | 5.6% |
| space5 | | | |
| Household Size | 2.27 | 2.56 | 2.60 |
| Households | 19,430 | 1,511 | 124,010,992 |
| Family Households | 11,863 | 1,048 | 80,755,759 |
| Married couple, w/children | 29.7% | 32.3% | 30.5% |
| Married couple, no children | 52.9% | 53.3% | 42.9% |
| Non Family Households | 7,567 | 463 | 43,255,233 |
| Single householder, w/children | 9.1% | 9.4% | 15.8% |
| Single householder, no children | 8.2% | 4.9% | 10.8% |