| | Weldon, CA | Soledad, CA | United States |
| Population | 2,261 | 25,102 | 329,725,481 |
| Female Population | 43.8% | 31.5% | 50.5% |
| Male Population | 56.2% | 68.5% | 49.5% |
| Median Age | 59.1 | 35.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,304 | 26,026 | 309,327,143 |
| Population - 2000 | 2,387 | 11,263 | 285,036,114 |
| Population - 1990 | 2,168 | 7,146 | 251,960,433 |
| Pop. 2000 to Now | -5.9% | 124.2% | 15.6% |
| Pop. 1990 to Now | 3.6% | 253.3% | 30.8% |
| space4 | | | |
| Population Density | 84.8 | 5,707.6 | 93.4 |
| Land Area | 26.7 | 4.4 | 3,531,905.4 |
| Water Area | 0.2 | 0.2 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Weldon, CA | Soledad, CA | United States |
| Age 0 to 4 | 6.7% | 5.4% | 5.9% |
| Age 5 to 9 | 1.8% | 5.6% | 6.1% |
| Age 10 to 14 | 7.5% | 9.1% | 6.6% |
| Age 15 to 17 | 0.0% | 3.4% | 3.9% |
| Age 18 to 20 | 0.6% | 4.4% | 4.0% |
| Age 21 to 24 | 4.2% | 6.2% | 5.2% |
| Age 25 to 34 | 12.5% | 15.3% | 13.8% |
| Age 35 to 44 | 4.9% | 16.7% | 12.9% |
| Age 45 to 54 | 4.8% | 16.8% | 12.6% |
| Age 55 to 59 | 12.3% | 7.8% | 6.7% |
| Age 60 to 64 | 6.1% | 3.7% | 6.3% |
| Age 65 to 74 | 33.0% | 3.7% | 9.6% |
| Age 75 to 84 | 2.4% | 1.7% | 4.5% |
| Age 85 and over | 3.2% | 0.3% | 1.9% |
| space1 | | | |
| Race | | | |
| | Weldon, CA | Soledad, CA | United States |
| White | 82.9% | 10.3% | 59.4% |
| Black | 2.3% | 9.3% | 12.2% |
| Asian | 0.6% | 2.1% | 5.6% |
| Native American | 3.5% | 0.4% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.3% | 0.2% |
| Other | 0.0% | 0.2% | 0.4% |
| Two or More Races | 4.5% | 1.1% | 3.2% |
| Hispanic | 6.3% | 76.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Weldon, CA | Soledad, CA | United States |
| Married Population | 31.3% | 41.7% | 49.8% |
| Currently Married | 26.2% | 38.6% | 48.0% |
| Married but Separated | 5.2% | 3.1% | 1.8% |
| Single Population | 68.7% | 58.3% | 50.2% |
| Never Married | 37.4% | 45.8% | 33.8% |
| Divorced | 23.2% | 10.2% | 10.8% |
| Widowed | 8.1% | 2.3% | 5.6% |
| space5 | | | |
| Household Size | 2.04 | 4.53 | 2.60 |
| Households | 1,110 | 3,660 | 124,010,992 |
| Family Households | 724 | 3,287 | 80,755,759 |
| Married couple, w/children | 1.8% | 52.8% | 30.5% |
| Married couple, no children | 32.3% | 22.5% | 42.9% |
| Non Family Households | 386 | 373 | 43,255,233 |
| Single householder, w/children | 29.3% | 15.8% | 15.8% |
| Single householder, no children | 36.6% | 8.9% | 10.8% |