| | Waterman, IL | Sandwich, IL | United States |
| Population | 1,602 | 7,182 | 329,725,481 |
| Female Population | 56.7% | 51.3% | 50.5% |
| Male Population | 43.3% | 48.7% | 49.5% |
| Median Age | 36.1 | 36.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,516 | 7,418 | 309,327,143 |
| Population - 2000 | 1,224 | 6,509 | 285,036,114 |
| Population - 1990 | 1,074 | 5,567 | 251,960,433 |
| Pop. 2000 to Now | 22.3% | 13.4% | 15.6% |
| Pop. 1990 to Now | 39.4% | 32.6% | 30.8% |
| space4 | | | |
| Population Density | 1,104.1 | 1,516.5 | 93.4 |
| Land Area | 1.5 | 4.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Waterman, IL | Sandwich, IL | United States |
| Age 0 to 4 | 7.5% | 7.1% | 5.9% |
| Age 5 to 9 | 6.9% | 7.0% | 6.1% |
| Age 10 to 14 | 9.4% | 7.1% | 6.6% |
| Age 15 to 17 | 4.6% | 3.9% | 3.9% |
| Age 18 to 20 | 5.4% | 4.4% | 4.0% |
| Age 21 to 24 | 5.9% | 7.9% | 5.2% |
| Age 25 to 34 | 8.7% | 10.9% | 13.8% |
| Age 35 to 44 | 21.2% | 15.2% | 12.9% |
| Age 45 to 54 | 9.7% | 9.8% | 12.6% |
| Age 55 to 59 | 7.6% | 4.1% | 6.7% |
| Age 60 to 64 | 4.7% | 5.2% | 6.3% |
| Age 65 to 74 | 6.1% | 10.0% | 9.6% |
| Age 75 to 84 | 1.3% | 5.6% | 4.5% |
| Age 85 and over | 1.0% | 1.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Waterman, IL | Sandwich, IL | United States |
| White | 81.6% | 87.4% | 59.4% |
| Black | 1.6% | 0.1% | 12.2% |
| Asian | 0.9% | 1.0% | 5.6% |
| Native American | 0.2% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 8.1% | 0.3% | 3.2% |
| Hispanic | 7.7% | 11.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Waterman, IL | Sandwich, IL | United States |
| Married Population | 61.5% | 46.4% | 49.8% |
| Currently Married | 60.8% | 45.3% | 48.0% |
| Married but Separated | 0.7% | 1.1% | 1.8% |
| Single Population | 38.5% | 53.6% | 50.2% |
| Never Married | 27.2% | 35.6% | 33.8% |
| Divorced | 8.5% | 11.7% | 10.8% |
| Widowed | 2.8% | 6.3% | 5.6% |
| space5 | | | |
| Household Size | 3.03 | 2.69 | 2.60 |
| Households | 529 | 2,606 | 124,010,992 |
| Family Households | 392 | 1,632 | 80,755,759 |
| Married couple, w/children | 44.6% | 36.3% | 30.5% |
| Married couple, no children | 42.3% | 38.8% | 42.9% |
| Non Family Households | 137 | 974 | 43,255,233 |
| Single householder, w/children | 10.2% | 12.4% | 15.8% |
| Single householder, no children | 2.8% | 12.5% | 10.8% |