| | Waterloo, CA | Linden, CA | United States |
| Population | 913 | 1,899 | 329,725,481 |
| Female Population | 48.9% | 49.6% | 50.5% |
| Male Population | 51.2% | 50.5% | 49.5% |
| Median Age | 39.5 | 36.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 287 | 1,901 | 309,327,143 |
| Population - 2000 | 435 | 1,103 | 285,036,114 |
| Population - 1990 | 502 | 1,339 | 251,960,433 |
| Pop. 2000 to Now | 83.5% | 102.7% | 15.6% |
| Pop. 1990 to Now | 59.0% | 67.0% | 30.8% |
| space4 | | | |
| Population Density | 168.0 | 256.3 | 93.4 |
| Land Area | 5.4 | 7.4 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Waterloo, CA | Linden, CA | United States |
| Age 0 to 4 | 6.6% | 10.1% | 5.9% |
| Age 5 to 9 | 3.3% | 5.3% | 6.1% |
| Age 10 to 14 | 3.9% | 7.5% | 6.6% |
| Age 15 to 17 | 3.7% | 5.6% | 3.9% |
| Age 18 to 20 | 11.1% | 0.7% | 4.0% |
| Age 21 to 24 | 0.0% | 4.1% | 5.2% |
| Age 25 to 34 | 10.8% | 12.4% | 13.8% |
| Age 35 to 44 | 14.0% | 17.1% | 12.9% |
| Age 45 to 54 | 4.1% | 4.7% | 12.6% |
| Age 55 to 59 | 4.4% | 5.5% | 6.7% |
| Age 60 to 64 | 20.3% | 9.8% | 6.3% |
| Age 65 to 74 | 11.6% | 6.0% | 9.6% |
| Age 75 to 84 | 3.2% | 8.6% | 4.5% |
| Age 85 and over | 3.1% | 2.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Waterloo, CA | Linden, CA | United States |
| White | 70.3% | 74.0% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 1.0% | 0.4% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 3.3% | 0.0% | 3.2% |
| Hispanic | 25.4% | 25.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Waterloo, CA | Linden, CA | United States |
| Married Population | 68.2% | 54.9% | 49.8% |
| Currently Married | 68.2% | 53.9% | 48.0% |
| Married but Separated | 0.0% | 1.0% | 1.8% |
| Single Population | 31.8% | 45.1% | 50.2% |
| Never Married | 21.9% | 25.9% | 33.8% |
| Divorced | 1.3% | 9.4% | 10.8% |
| Widowed | 8.6% | 9.8% | 5.6% |
| space5 | | | |
| Household Size | 2.67 | 2.77 | 2.60 |
| Households | 342 | 685 | 124,010,992 |
| Family Households | 325 | 522 | 80,755,759 |
| Married couple, w/children | 12.3% | 28.4% | 30.5% |
| Married couple, no children | 62.8% | 43.3% | 42.9% |
| Non Family Households | 17 | 163 | 43,255,233 |
| Single householder, w/children | 24.9% | 23.2% | 15.8% |
| Single householder, no children | 0.0% | 5.2% | 10.8% |