Walnut Creek used to be very high end community in the Bay Area.
As of the old census of 2010 (Wikipedia) The racial makeup of Walnut Creek was 50,487 (78.7 percent) White, 1,035 (1.6 percent) African American......
Households in Walnut Creek, CA have a median annual income of $105,948, which is more than the median annual US income of $65,712 .