Bet you didn’t know California has 517,173 mobile homes.

While I was reviewing Census Bureau data on housing, a curious data point popped up: Only three states had more mobile homes than California. But as the nation’s most populous state, it’s another affordable-housing metric where California trails the pack: pre-fabricated homes are a tiny share of our residential-living supply — 3.7 percent vs. 6.6 percent in the rest of the nation.

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