| | Rockland, ME | Poway, CA | United States |
| Population | 6,977 | 49,005 | 329,725,481 |
| Female Population | 53.1% | 48.8% | 50.5% |
| Male Population | 46.9% | 51.2% | 49.5% |
| Median Age | 45.4 | 41.6 | 38.4 |
| space3 | | | |
| Population - 2010 | 7,295 | 47,924 | 309,327,143 |
| Population - 2000 | 7,609 | 48,044 | 285,036,114 |
| Population - 1990 | 7,972 | 43,516 | 251,960,433 |
| Pop. 2000 to Now | -5.6% | 2.5% | 15.6% |
| Pop. 1990 to Now | -9.9% | 13.2% | 30.8% |
| space4 | | | |
| Population Density | 543.3 | 1,254.0 | 93.4 |
| Land Area | 12.8 | 39.1 | 3,531,905.4 |
| Water Area | 2.2 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Rockland, ME | Poway, CA | United States |
| Age 0 to 4 | 3.8% | 5.8% | 5.9% |
| Age 5 to 9 | 5.3% | 7.1% | 6.1% |
| Age 10 to 14 | 6.4% | 6.1% | 6.6% |
| Age 15 to 17 | 3.5% | 3.1% | 3.9% |
| Age 18 to 20 | 2.7% | 3.3% | 4.0% |
| Age 21 to 24 | 4.4% | 3.6% | 5.2% |
| Age 25 to 34 | 13.6% | 12.0% | 13.8% |
| Age 35 to 44 | 9.7% | 12.9% | 12.9% |
| Age 45 to 54 | 8.3% | 12.9% | 12.6% |
| Age 55 to 59 | 9.1% | 7.3% | 6.7% |
| Age 60 to 64 | 11.2% | 7.1% | 6.3% |
| Age 65 to 74 | 12.2% | 11.3% | 9.6% |
| Age 75 to 84 | 7.1% | 5.5% | 4.5% |
| Age 85 and over | 2.8% | 1.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Rockland, ME | Poway, CA | United States |
| White | 95.4% | 62.2% | 59.4% |
| Black | 0.0% | 1.8% | 12.2% |
| Asian | 0.9% | 12.2% | 5.6% |
| Native American | 0.2% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.6% | 0.2% |
| Other | 0.0% | 0.4% | 0.4% |
| Two or More Races | 2.6% | 5.9% | 3.2% |
| Hispanic | 0.9% | 16.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Rockland, ME | Poway, CA | United States |
| Married Population | 38.6% | 59.4% | 49.8% |
| Currently Married | 37.2% | 58.2% | 48.0% |
| Married but Separated | 1.5% | 1.1% | 1.8% |
| Single Population | 61.4% | 40.6% | 50.2% |
| Never Married | 33.6% | 27.2% | 33.8% |
| Divorced | 20.6% | 8.4% | 10.8% |
| Widowed | 7.2% | 5.0% | 5.6% |
| space5 | | | |
| Household Size | 2.01 | 2.98 | 2.60 |
| Households | 3,367 | 16,261 | 124,010,992 |
| Family Households | 1,437 | 12,816 | 80,755,759 |
| Married couple, w/children | 21.5% | 34.2% | 30.5% |
| Married couple, no children | 53.0% | 47.7% | 42.9% |
| Non Family Households | 1,930 | 3,445 | 43,255,233 |
| Single householder, w/children | 21.2% | 8.6% | 15.8% |
| Single householder, no children | 4.4% | 9.5% | 10.8% |