| | Unity, ME | Orinda, CA | United States |
| Population | 2,043 | 19,497 | 329,725,481 |
| Female Population | 52.4% | 51.1% | 50.5% |
| Male Population | 47.6% | 48.9% | 49.5% |
| Median Age | 29.9 | 49 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,103 | 17,799 | 309,327,143 |
| Population - 2000 | 1,889 | 17,599 | 285,036,114 |
| Population - 1990 | 1,817 | 16,642 | 251,960,433 |
| Pop. 2000 to Now | 11.8% | 11.1% | 15.6% |
| Pop. 1990 to Now | 16.2% | 17.5% | 30.8% |
| space4 | | | |
| Population Density | 51.9 | 1,516.9 | 93.4 |
| Land Area | 39.4 | 12.9 | 3,531,905.4 |
| Water Area | 2.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Unity, ME | Orinda, CA | United States |
| Age 0 to 4 | 7.8% | 4.4% | 5.9% |
| Age 5 to 9 | 4.6% | 5.9% | 6.1% |
| Age 10 to 14 | 4.5% | 9.0% | 6.6% |
| Age 15 to 17 | 1.6% | 5.6% | 3.9% |
| Age 18 to 20 | 16.5% | 2.7% | 4.0% |
| Age 21 to 24 | 6.8% | 1.9% | 5.2% |
| Age 25 to 34 | 18.7% | 3.5% | 13.8% |
| Age 35 to 44 | 6.4% | 10.6% | 12.9% |
| Age 45 to 54 | 11.5% | 18.5% | 12.6% |
| Age 55 to 59 | 4.5% | 9.1% | 6.7% |
| Age 60 to 64 | 4.4% | 6.5% | 6.3% |
| Age 65 to 74 | 5.8% | 12.2% | 9.6% |
| Age 75 to 84 | 5.7% | 7.3% | 4.5% |
| Age 85 and over | 1.3% | 2.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Unity, ME | Orinda, CA | United States |
| White | 91.6% | 70.4% | 59.4% |
| Black | 1.0% | 0.6% | 12.2% |
| Asian | 1.1% | 14.6% | 5.6% |
| Native American | 1.8% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 2.2% | 8.2% | 3.2% |
| Hispanic | 2.3% | 6.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Unity, ME | Orinda, CA | United States |
| Married Population | 35.2% | 67.0% | 49.8% |
| Currently Married | 34.8% | 66.1% | 48.0% |
| Married but Separated | 0.5% | 0.8% | 1.8% |
| Single Population | 64.8% | 33.0% | 50.2% |
| Never Married | 44.7% | 21.9% | 33.8% |
| Divorced | 13.4% | 5.9% | 10.8% |
| Widowed | 6.7% | 5.2% | 5.6% |
| space5 | | | |
| Household Size | 2.32 | 2.68 | 2.60 |
| Households | 693 | 7,252 | 124,010,992 |
| Family Households | 347 | 5,547 | 80,755,759 |
| Married couple, w/children | 29.1% | 45.4% | 30.5% |
| Married couple, no children | 51.9% | 47.0% | 42.9% |
| Non Family Households | 346 | 1,705 | 43,255,233 |
| Single householder, w/children | 11.0% | 3.6% | 15.8% |
| Single householder, no children | 8.1% | 4.0% | 10.8% |