| | Elmer, NJ | Hopland, CA | United States |
| Population | 1,285 | 922 | 329,725,481 |
| Female Population | 50.2% | 43.9% | 50.5% |
| Male Population | 49.8% | 56.1% | 49.5% |
| Median Age | 38.4 | 47.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,396 | 874 | 309,327,143 |
| Population - 2000 | 1,384 | 888 | 285,036,114 |
| Population - 1990 | 1,571 | 562 | 251,960,433 |
| Pop. 2000 to Now | -5.2% | 1.7% | 15.6% |
| Pop. 1990 to Now | -16.5% | 60.7% | 30.8% |
| space4 | | | |
| Population Density | 1,437.4 | 261.6 | 93.4 |
| Land Area | 0.9 | 3.5 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Elmer, NJ | Hopland, CA | United States |
| Age 0 to 4 | 4.7% | 5.3% | 5.9% |
| Age 5 to 9 | 6.4% | 4.3% | 6.1% |
| Age 10 to 14 | 6.2% | 2.7% | 6.6% |
| Age 15 to 17 | 1.8% | 1.5% | 3.9% |
| Age 18 to 20 | 4.4% | 0.7% | 4.0% |
| Age 21 to 24 | 6.1% | 2.0% | 5.2% |
| Age 25 to 34 | 13.4% | 22.7% | 13.8% |
| Age 35 to 44 | 16.3% | 10.6% | 12.9% |
| Age 45 to 54 | 13.6% | 6.0% | 12.6% |
| Age 55 to 59 | 5.3% | 9.4% | 6.7% |
| Age 60 to 64 | 6.9% | 13.2% | 6.3% |
| Age 65 to 74 | 9.6% | 20.2% | 9.6% |
| Age 75 to 84 | 4.5% | 1.4% | 4.5% |
| Age 85 and over | 0.7% | 0.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Elmer, NJ | Hopland, CA | United States |
| White | 90.6% | 56.1% | 59.4% |
| Black | 3.3% | 0.0% | 12.2% |
| Asian | 4.0% | 0.0% | 5.6% |
| Native American | 0.0% | 0.4% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 1.4% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.5% | 3.3% | 3.2% |
| Hispanic | 1.5% | 38.8% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Elmer, NJ | Hopland, CA | United States |
| Married Population | 49.0% | 41.5% | 49.8% |
| Currently Married | 45.3% | 41.5% | 48.0% |
| Married but Separated | 3.7% | 0.0% | 1.8% |
| Single Population | 51.0% | 58.5% | 50.2% |
| Never Married | 36.1% | 43.2% | 33.8% |
| Divorced | 10.6% | 13.7% | 10.8% |
| Widowed | 4.2% | 1.6% | 5.6% |
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| Household Size | 2.90 | 2.93 | 2.60 |
| Households | 441 | 315 | 124,010,992 |
| Family Households | 287 | 210 | 80,755,759 |
| Married couple, w/children | 43.9% | 11.0% | 30.5% |
| Married couple, no children | 36.2% | 63.3% | 42.9% |
| Non Family Households | 154 | 105 | 43,255,233 |
| Single householder, w/children | 12.9% | 10.5% | 15.8% |
| Single householder, no children | 7.0% | 15.2% | 10.8% |