I live in the SE corner of Cal., despite being an affluent state, you have a real large poor population in agricultural Imperial valley and rural Colorado River valley (Blythe and Needles) on the CA-AZ line. Imperial county itself has 7 incorporated towns, all are among the state's poorest and Calexico is literally on the Mexican border, the third or developing world is a step away if you're in their city center. And the "East" (Coachella) Valley is where over half the population earns $25k (annual average personal income) while the median is $50k, the town Coachella (pop: 50,000) itself is between farmland and golf resorts has a huge poverty problem, plus 25% of the town is Indian reservation land.