Per US Census Bureau Quick Facts, 2003 Median Household Income: San Diego $48,634, Orange $55,861, Ventura $57,864, meaning OC and VC are 14.9% and 19.0% above SD, respectively.
Interestingly, the Census’ American Community Survey shows an increase in inflation-adjusted median household income between 2003 and 2004 for SD and OC of .1% (from $50,611 to $51,012) and 5% (from $61,329 to $64,416), respectively (Ventura not given).