Counties with the most prewar homes in California

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- Share of homes built prewar: 7.5%
- Total prewar homes: 14,220

#20. Sonoma County
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- Share of homes built prewar: 7.5%
- Total prewar homes: 1,443

#19. San Benito County
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- Share of homes built prewar: 7.8%
- Total prewar homes: 11,519

#18. Santa Barbara County
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- Share of homes built prewar: 8.3%
- Total prewar homes: 1,272

#17. Amador County
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- Share of homes built prewar: 8.3%
- Total prewar homes: 21,964

#16. San Mateo County
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- Share of homes built prewar: 8.3%
- Total prewar homes: 4,070

#15. Napa County
CL Shebley // Shutterstock

- Share of homes built prewar: 8.9%
- Total prewar homes: 871

#14. Glenn County
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- Share of homes built prewar: 9.4%
- Total prewar homes: 834

#13. Lassen County
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- Share of homes built prewar: 9.9%
- Total prewar homes: 773

#12. Inyo County
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- Share of homes built prewar: 11.4%
- Total prewar homes: 11,027

#11. Santa Cruz County
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- Share of homes built prewar: 11.5%
- Total prewar homes: 838

#10. Colusa County
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- Share of homes built prewar: 11.6%
- Total prewar homes: 3,967

#9. Mendocino County
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- Share of homes built prewar: 12.5%
- Total prewar homes: 13,006

#8. Marin County
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- Share of homes built prewar: 13.9%
- Total prewar homes: 2,585

#7. Siskiyou County
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- Share of homes built prewar: 14.3%
- Total prewar homes: 7,670

#6. Humboldt County
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- Share of homes built prewar: 14.3%
- Total prewar homes: 479,277

#5. Los Angeles County
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- Share of homes built prewar: 15.6%
- Total prewar homes: 531

#4. Modoc County
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- Share of homes built prewar: 16.3%
- Total prewar homes: 188

#3. Sierra County
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- Share of homes built prewar: 18.8%
- Total prewar homes: 109,643

#2. Alameda County
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- Share of homes built prewar: 45.2%
- Total prewar homes: 163,210

This story features data reporting and writing by Elena Cox and is part of a series utilizing data automation across 50 states.

#1. San Francisco County
Felix Lipov // Shutterstock