This was 5.8 percent lower than the state average of 42.7 percent. In 2020 the total municipality population reached 8,420.
75.3 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in South San Gabriel CDP for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 1,530 | 24.7 |
| Regular high school diploma | 1,282 | 20.7 |
| GED or alternative credential | 164 | 2.6 |
| Some college, less than 1 year | 211 | 3.4 |
| Some college, 1 or more years, no degree | 727 | 11.7 |
| Associate's degree | 579 | 9.3 |
| Bachelor's degree | 1,394 | 22.5 |
| Master's degree | 195 | 3.1 |
| Professional school degree | 87 | 1.4 |
| Doctorate degree | 33 | 0.5 |
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