Mill Valley
Ghost town · Calaveras County, California
Mill Valley is a ghost town in Calaveras County, California, recorded as human settlement in United States of America. It is one of 6 former communities in Calaveras County on the federal names register. That ranks the county 47th among the 58 California counties with a vanished settlement on record.
The U.S. Geological Survey lists Mill Valley as a historical populated place: the name is no longer in official use for a community, whether the settlement was abandoned, absorbed into a neighbouring town or renamed.
Key facts
Questions
Where is Mill Valley?
Mill Valley is in Calaveras County, California.
How many ghost towns are in Calaveras County?
Calaveras County, California has 6 ghost towns on record at Wayfarrow.
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Facts marked "approximately" carry an uncertain date in the source. Text on this page is generated from the sources above; no encyclopedia prose is copied. Last updated 2026-11-05.