| | Montebello, CA | Crestline, CA | United States |
| Population | 62,828 | 9,350 | 329,725,481 |
| Female Population | 50.6% | 51.8% | 50.5% |
| Male Population | 49.4% | 48.2% | 49.5% |
| Median Age | 37.4 | 45.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 62,513 | 8,936 | 309,327,143 |
| Population - 2000 | 62,150 | 10,218 | 285,036,114 |
| Population - 1990 | 59,564 | 8,594 | 251,960,433 |
| Pop. 2000 to Now | -1.0% | -2.9% | 15.6% |
| Pop. 1990 to Now | 3.3% | 15.4% | 30.8% |
| space4 | | | |
| Population Density | 7,540.6 | 676.1 | 93.4 |
| Land Area | 8.3 | 13.8 | 3,531,905.4 |
| Water Area | 0.0 | 0.2 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Montebello, CA | Crestline, CA | United States |
| Age 0 to 4 | 5.6% | 5.5% | 5.9% |
| Age 5 to 9 | 5.9% | 4.9% | 6.1% |
| Age 10 to 14 | 6.7% | 5.9% | 6.6% |
| Age 15 to 17 | 3.5% | 2.3% | 3.9% |
| Age 18 to 20 | 3.6% | 3.0% | 4.0% |
| Age 21 to 24 | 5.0% | 4.6% | 5.2% |
| Age 25 to 34 | 16.4% | 13.3% | 13.8% |
| Age 35 to 44 | 13.2% | 9.8% | 12.9% |
| Age 45 to 54 | 12.4% | 12.8% | 12.6% |
| Age 55 to 59 | 6.0% | 9.7% | 6.7% |
| Age 60 to 64 | 5.3% | 8.8% | 6.3% |
| Age 65 to 74 | 8.4% | 14.3% | 9.6% |
| Age 75 to 84 | 5.0% | 4.0% | 4.5% |
| Age 85 and over | 2.9% | 1.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Montebello, CA | Crestline, CA | United States |
| White | 6.1% | 68.2% | 59.4% |
| Black | 0.6% | 3.8% | 12.2% |
| Asian | 12.7% | 0.7% | 5.6% |
| Native American | 0.1% | 1.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.3% | 1.0% | 0.4% |
| Two or More Races | 0.6% | 3.7% | 3.2% |
| Hispanic | 79.6% | 21.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Montebello, CA | Crestline, CA | United States |
| Married Population | 43.1% | 49.4% | 49.8% |
| Currently Married | 40.6% | 48.8% | 48.0% |
| Married but Separated | 2.5% | 0.6% | 1.8% |
| Single Population | 56.9% | 50.6% | 50.2% |
| Never Married | 42.9% | 27.0% | 33.8% |
| Divorced | 8.0% | 16.5% | 10.8% |
| Widowed | 5.9% | 7.1% | 5.6% |
| space5 | | | |
| Household Size | 3.26 | 2.45 | 2.60 |
| Households | 19,119 | 3,795 | 124,010,992 |
| Family Households | 14,746 | 2,466 | 80,755,759 |
| Married couple, w/children | 23.9% | 23.3% | 30.5% |
| Married couple, no children | 33.0% | 48.1% | 42.9% |
| Non Family Households | 4,373 | 1,329 | 43,255,233 |
| Single householder, w/children | 20.9% | 13.4% | 15.8% |
| Single householder, no children | 22.2% | 15.1% | 10.8% |