This is largely based on geography and the economies, and thus lifestyles that result. I'd also break up Fresno and Tulare counties, making their eastern halves part of Sierra. Eastern Kern county should be part of Southern California.
| Population | Estimated median income |
Voter registration | Race/Ethnicity | ||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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California statewide |
37,325,068 | $61,400 |
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| Southern California | 20,369,862 | $59,903 |
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| Northern California | 7,498,282 | $77,548 |
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| Sierra | 842,646 | $63,973 |
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| San Joaquin | 6,095,481 | $50,094 |
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| Pacifica | 1,988,175 | $67,059 |
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| Shasta | 530,622 | $42,524 |
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Sources: 2012 American Community Survey 5-year estimates, California Secretary of State.
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