The Franchise Tax Board released county income statistics for 2005 last week. Not surprisingly, the San Francisco Bay Area had the wealthiest individuals (as measured by tax returns), with Marin County leading the way with a median income of $48,854 (income here is defined as an individual’s Adjusted Gross Income). Second was San Mateo County at $45,992 while Santa Clara County came in third at $45,239.
California received the most returns from Los Angeles County—which isn’t surprising when you consider it’s the most populous county in California. However, Los Angeles County ranked 39th out of California’s 58 counties in income.
At the bottom for income is Imperial County, with an average individual AGI of only $22,962. Tulare County is second lowest at $24,774.
You can find the statistics here.