| | Mountain Brook, AL | Ramona, CA | United States |
| Population | 22,184 | 21,853 | 329,725,481 |
| Female Population | 51.6% | 48.5% | 50.5% |
| Male Population | 48.4% | 51.5% | 49.5% |
| Median Age | 41.9 | 38.2 | 38.4 |
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| Population - 2010 | 20,316 | 21,482 | 309,327,143 |
| Population - 2000 | 20,604 | 15,691 | 285,036,114 |
| Population - 1990 | 19,810 | 13,040 | 251,960,433 |
| Pop. 2000 to Now | -2.8% | 41.6% | 15.6% |
| Pop. 1990 to Now | 1.1% | 70.4% | 30.8% |
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| Population Density | 1,729.8 | 568.6 | 93.4 |
| Land Area | 12.8 | 38.4 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Mountain Brook, AL | Ramona, CA | United States |
| Age 0 to 4 | 8.3% | 5.2% | 5.9% |
| Age 5 to 9 | 6.8% | 5.6% | 6.1% |
| Age 10 to 14 | 7.5% | 7.6% | 6.6% |
| Age 15 to 17 | 5.1% | 2.7% | 3.9% |
| Age 18 to 20 | 3.0% | 5.9% | 4.0% |
| Age 21 to 24 | 1.6% | 6.0% | 5.2% |
| Age 25 to 34 | 10.3% | 12.5% | 13.8% |
| Age 35 to 44 | 10.9% | 12.4% | 12.9% |
| Age 45 to 54 | 16.0% | 14.6% | 12.6% |
| Age 55 to 59 | 5.0% | 7.0% | 6.7% |
| Age 60 to 64 | 7.0% | 6.1% | 6.3% |
| Age 65 to 74 | 12.1% | 9.2% | 9.6% |
| Age 75 to 84 | 3.1% | 3.7% | 4.5% |
| Age 85 and over | 3.2% | 1.5% | 1.9% |
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| Race | | | |
| | Mountain Brook, AL | Ramona, CA | United States |
| White | 97.7% | 54.8% | 59.4% |
| Black | 0.4% | 1.0% | 12.2% |
| Asian | 1.0% | 1.6% | 5.6% |
| Native American | 0.0% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.2% | 0.3% | 0.4% |
| Two or More Races | 0.5% | 3.7% | 3.2% |
| Hispanic | 0.2% | 38.5% | 18.4% |
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| Marriage & Family | | | |
| | Mountain Brook, AL | Ramona, CA | United States |
| Married Population | 70.0% | 50.6% | 49.8% |
| Currently Married | 69.9% | 49.1% | 48.0% |
| Married but Separated | 0.1% | 1.5% | 1.8% |
| Single Population | 30.0% | 49.4% | 50.2% |
| Never Married | 21.5% | 34.8% | 33.8% |
| Divorced | 4.5% | 9.9% | 10.8% |
| Widowed | 4.0% | 4.7% | 5.6% |
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| Household Size | 2.65 | 3.04 | 2.60 |
| Households | 8,365 | 7,156 | 124,010,992 |
| Family Households | 6,315 | 5,087 | 80,755,759 |
| Married couple, w/children | 48.8% | 32.9% | 30.5% |
| Married couple, no children | 44.6% | 42.7% | 42.9% |
| Non Family Households | 2,050 | 2,069 | 43,255,233 |
| Single householder, w/children | 3.4% | 11.5% | 15.8% |
| Single householder, no children | 3.2% | 12.9% | 10.8% |