| | Ashland, CA | Union City, CA | United States |
| Population | 23,640 | 70,828 | 329,725,481 |
| Female Population | 53.7% | 48.9% | 50.5% |
| Male Population | 46.3% | 51.1% | 49.5% |
| Median Age | 36.1 | 40.8 | 38.4 |
| space3 | | | |
| Population - 2010 | 22,098 | 69,628 | 309,327,143 |
| Population - 2000 | 20,793 | 66,869 | 285,036,114 |
| Population - 1990 | 16,590 | 53,762 | 251,960,433 |
| Pop. 2000 to Now | 19.7% | 11.4% | 15.6% |
| Pop. 1990 to Now | 50.1% | 38.6% | 30.8% |
| space4 | | | |
| Population Density | 12,868.8 | 3,650.9 | 93.4 |
| Land Area | 1.8 | 19.4 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Ashland, CA | Union City, CA | United States |
| Age 0 to 4 | 7.5% | 4.6% | 5.9% |
| Age 5 to 9 | 5.5% | 5.0% | 6.1% |
| Age 10 to 14 | 7.1% | 5.6% | 6.6% |
| Age 15 to 17 | 3.5% | 3.0% | 3.9% |
| Age 18 to 20 | 3.6% | 3.0% | 4.0% |
| Age 21 to 24 | 4.4% | 4.9% | 5.2% |
| Age 25 to 34 | 16.1% | 14.9% | 13.8% |
| Age 35 to 44 | 15.8% | 14.8% | 12.9% |
| Age 45 to 54 | 15.6% | 13.7% | 12.6% |
| Age 55 to 59 | 5.2% | 7.0% | 6.7% |
| Age 60 to 64 | 5.1% | 6.8% | 6.3% |
| Age 65 to 74 | 6.3% | 9.9% | 9.6% |
| Age 75 to 84 | 2.6% | 4.6% | 4.5% |
| Age 85 and over | 1.6% | 2.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Ashland, CA | Union City, CA | United States |
| White | 10.3% | 14.7% | 59.4% |
| Black | 14.5% | 4.7% | 12.2% |
| Asian | 23.0% | 55.0% | 5.6% |
| Native American | 0.6% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 1.0% | 0.9% | 0.2% |
| Other | 1.4% | 0.2% | 0.4% |
| Two or More Races | 3.1% | 3.8% | 3.2% |
| Hispanic | 46.1% | 20.3% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Ashland, CA | Union City, CA | United States |
| Married Population | 38.2% | 57.2% | 49.8% |
| Currently Married | 36.3% | 56.1% | 48.0% |
| Married but Separated | 1.9% | 1.1% | 1.8% |
| Single Population | 61.8% | 42.8% | 50.2% |
| Never Married | 46.8% | 31.3% | 33.8% |
| Divorced | 8.1% | 6.4% | 10.8% |
| Widowed | 6.9% | 5.1% | 5.6% |
| space5 | | | |
| Household Size | 3.10 | 3.37 | 2.60 |
| Households | 7,575 | 20,800 | 124,010,992 |
| Family Households | 5,304 | 16,979 | 80,755,759 |
| Married couple, w/children | 30.7% | 35.0% | 30.5% |
| Married couple, no children | 22.7% | 46.1% | 42.9% |
| Non Family Households | 2,271 | 3,821 | 43,255,233 |
| Single householder, w/children | 25.0% | 7.9% | 15.8% |
| Single householder, no children | 21.7% | 11.1% | 10.8% |