In most other parts of the US, residents make much less. In the majority of Southern counties, over a quarter of households earn less than $25,000.

As you can see in the map below, many people in the bright blue urban centers, like Seattle and New York City, make over $100,000.

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The map indicates income brackets with four different colors.

The blue dots represent areas where the average household makes at least $100,000 per year; purple is $50,000 to $100,000; pink is $25,000 to $50,000; and red is less than $25,000. Larger circles mean more households with a particular salary range.

But the San Francisco Bay Area's blue shines the brightest, meaning there are a lot of households that earn six figures.

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Nationwide, about 25% of households earn six figures. Around 22% of households earn less than $25,000 annually.

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As a whole, the Bay Area is extremely wealthy. But there are also pockets of poverty throughout.

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In Silicon Valley — which features some of the Bay Area's most expensive neighborhoods — the map features many blue dots:.

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According to the Silicon Valley Institute for Regional Studies, the median household income in Silicon Valley is around $110,373.

But not all of the Bay Area — or even all of San Francisco — is rich.

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As The Mercury News recently reported, some Bay Area households that earn six figures are now considered "low-income" because of how expensive the region has become.

In San Francisco's Tenderloin neighborhood, you will see splotches of red on the map, meaning most households make less than $25,000 annually:

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If you go further south, blue covers San Francisco's Mission District neighborhood, where six-figure salaries are common.

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So it's perhaps no surprise that living in the Bay Area at large is unaffordable for many people. The area's housing stock struggles to keep up with demand, contributing to high real-estate prices.

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Source: The Guardian