From a total population of 4,010, San Joaquin has a median age of 22.5. The average age of males, in San Joaquin, is 21.3 while the average age of females is 23.7. When you compare this to median age of California, San Joaquin is 13.1 years younger.
The median income of individuals, in San Joaquin, is $7,519 while the average household income is $25,545. When comparing the median income of people living in San Joaquin to the rest of California, the average income in San Joaquin is $22,387 less.