Day is an unincorporated community in Modoc County, California, United States. It is located west of Adin, at an elevation of 3645 feet (1111 m).
A post office operated at Day from 1888 to 1925 and from 1926 to 1953.
The lightning-sparked Day Fire in 2014 started just north of the community, ultimately destroying six structures and injuring seven people.
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