| | Old Lyme, CT | Wareham, MA | United States |
| Population | 7,582 | 23,149 | 329,725,481 |
| Female Population | 50.0% | 53.1% | 50.5% |
| Male Population | 50.0% | 46.9% | 49.5% |
| Median Age | 49.8 | 52.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 7,604 | 21,872 | 309,327,143 |
| Population - 2000 | 7,406 | 20,335 | 285,036,114 |
| Population - 1990 | 6,535 | 19,232 | 251,960,433 |
| Pop. 2000 to Now | -1.7% | 12.0% | 15.6% |
| Pop. 1990 to Now | 11.4% | 18.4% | 30.8% |
| space4 | | | |
| Population Density | 329.4 | 645.5 | 93.4 |
| Land Area | 23.0 | 35.9 | 3,531,905.4 |
| Water Area | 5.8 | 10.4 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Old Lyme, CT | Wareham, MA | United States |
| Age 0 to 4 | 4.4% | 2.3% | 5.9% |
| Age 5 to 9 | 4.1% | 4.6% | 6.1% |
| Age 10 to 14 | 6.9% | 4.5% | 6.6% |
| Age 15 to 17 | 4.8% | 3.5% | 3.9% |
| Age 18 to 20 | 2.5% | 3.3% | 4.0% |
| Age 21 to 24 | 3.5% | 3.3% | 5.2% |
| Age 25 to 34 | 6.5% | 9.9% | 13.8% |
| Age 35 to 44 | 9.7% | 9.7% | 12.9% |
| Age 45 to 54 | 16.6% | 13.5% | 12.6% |
| Age 55 to 59 | 8.6% | 11.0% | 6.7% |
| Age 60 to 64 | 8.4% | 7.9% | 6.3% |
| Age 65 to 74 | 15.4% | 15.8% | 9.6% |
| Age 75 to 84 | 6.1% | 7.9% | 4.5% |
| Age 85 and over | 2.5% | 2.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Old Lyme, CT | Wareham, MA | United States |
| White | 88.5% | 83.2% | 59.4% |
| Black | 0.0% | 2.1% | 12.2% |
| Asian | 2.1% | 1.6% | 5.6% |
| Native American | 0.2% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.1% | 0.0% | 0.2% |
| Other | 0.1% | 6.1% | 0.4% |
| Two or More Races | 3.4% | 4.6% | 3.2% |
| Hispanic | 5.7% | 2.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Old Lyme, CT | Wareham, MA | United States |
| Married Population | 61.0% | 47.1% | 49.8% |
| Currently Married | 60.7% | 45.7% | 48.0% |
| Married but Separated | 0.3% | 1.4% | 1.8% |
| Single Population | 39.0% | 52.9% | 50.2% |
| Never Married | 22.1% | 31.5% | 33.8% |
| Divorced | 11.0% | 12.5% | 10.8% |
| Widowed | 5.9% | 8.8% | 5.6% |
| space5 | | | |
| Household Size | 2.44 | 2.23 | 2.60 |
| Households | 3,100 | 10,280 | 124,010,992 |
| Family Households | 2,207 | 6,465 | 80,755,759 |
| Married couple, w/children | 32.4% | 20.7% | 30.5% |
| Married couple, no children | 53.2% | 48.6% | 42.9% |
| Non Family Households | 893 | 3,815 | 43,255,233 |
| Single householder, w/children | 8.6% | 17.6% | 15.8% |
| Single householder, no children | 5.9% | 13.2% | 10.8% |