California Counties with the Fewest Land Borders

There are fifty-eight counties in the Golden State. Name the counties that share the fewest land borders with other counties in California.

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Last updated: April 18, 2026

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Number of Borders	Answer	Counties Bordered
One Border	Marin	Sonoma
One Border	San Francisco	San Mateo
Two Borders	Del Norte	Humboldt, Siskiyou
Two Borders	Imperial	Riverside, San Diego
Three Borders	Modoc	Lassen, Shasta, Siskiyou
Three Borders	Nevada	Placer, Sierra, Yuba
Three Borders	San Diego	Imperial, Orange, Riverside
Three Borders	San Mateo	San Francisco, Santa Clara, Santa Cruz
Three Borders	Santa Cruz	Monterey, San Mateo, Santa Clara
Three Borders	Ventura	Kern, Los Angeles, Santa Barbara