2010 United States Census reported that San Joaquin County had a population of 685,306. The racial makeup of San Joaquin County was 349,287 (51.0 percent) White , 51,744 (7.6 percent) African American , 7,196 (1.1 percent) Native American , 98,472 (14.4 percent) Asian , 3,758 (0.5 percent) Pacific Islander , 131,054