| | Chatham, NY | Ipswich, MA | United States |
| Population | 4,079 | 13,740 | 329,725,481 |
| Female Population | 50.7% | 53.3% | 50.5% |
| Male Population | 49.3% | 46.7% | 49.5% |
| Median Age | 49.9 | 48.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 4,130 | 13,219 | 309,327,143 |
| Population - 2000 | 4,249 | 12,987 | 285,036,114 |
| Population - 1990 | 4,413 | 11,873 | 251,960,433 |
| Pop. 2000 to Now | -10.1% | 8.5% | 15.6% |
| Pop. 1990 to Now | -13.5% | 18.7% | 30.8% |
| space4 | | | |
| Population Density | 76.6 | 427.9 | 93.4 |
| Land Area | 53.2 | 32.1 | 3,531,905.4 |
| Water Area | 0.3 | 10.4 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Chatham, NY | Ipswich, MA | United States |
| Age 0 to 4 | 4.0% | 3.7% | 5.9% |
| Age 5 to 9 | 4.5% | 4.4% | 6.1% |
| Age 10 to 14 | 8.4% | 7.0% | 6.6% |
| Age 15 to 17 | 4.6% | 4.2% | 3.9% |
| Age 18 to 20 | 1.7% | 3.6% | 4.0% |
| Age 21 to 24 | 2.9% | 4.2% | 5.2% |
| Age 25 to 34 | 7.4% | 8.1% | 13.8% |
| Age 35 to 44 | 10.6% | 10.8% | 12.9% |
| Age 45 to 54 | 16.1% | 16.5% | 12.6% |
| Age 55 to 59 | 7.6% | 9.8% | 6.7% |
| Age 60 to 64 | 6.0% | 5.9% | 6.3% |
| Age 65 to 74 | 19.1% | 12.0% | 9.6% |
| Age 75 to 84 | 6.2% | 6.7% | 4.5% |
| Age 85 and over | 0.9% | 3.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Chatham, NY | Ipswich, MA | United States |
| White | 86.7% | 91.2% | 59.4% |
| Black | 4.8% | 1.1% | 12.2% |
| Asian | 0.1% | 2.4% | 5.6% |
| Native American | 0.3% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.7% | 0.0% | 0.4% |
| Two or More Races | 5.9% | 1.6% | 3.2% |
| Hispanic | 1.5% | 3.7% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Chatham, NY | Ipswich, MA | United States |
| Married Population | 60.4% | 56.0% | 49.8% |
| Currently Married | 57.1% | 54.8% | 48.0% |
| Married but Separated | 3.3% | 1.3% | 1.8% |
| Single Population | 39.6% | 44.0% | 50.2% |
| Never Married | 24.1% | 25.1% | 33.8% |
| Divorced | 11.2% | 12.5% | 10.8% |
| Widowed | 4.3% | 6.4% | 5.6% |
| space5 | | | |
| Household Size | 2.44 | 2.44 | 2.60 |
| Households | 1,674 | 5,573 | 124,010,992 |
| Family Households | 1,140 | 3,571 | 80,755,759 |
| Married couple, w/children | 24.6% | 32.3% | 30.5% |
| Married couple, no children | 55.7% | 54.1% | 42.9% |
| Non Family Households | 534 | 2,002 | 43,255,233 |
| Single householder, w/children | 14.0% | 7.8% | 15.8% |
| Single householder, no children | 5.6% | 5.8% | 10.8% |