A helpful statewide atlas for California is Warren A. Beck, Historical Atlas of California (Norman, Oklahoma: University of Oklahoma Press, 1974. (FHL book 979.4 E3b; fiche 6054102).
City ward maps of San Francisco for the years 1853, 1856, 1867, 1877, and 1894 are on FHL film 1377700; fiche 6016767-71. These are useful with census reports.
The Family History Library has a selection of maps of the gold regions and mining districts, ghost towns, railways, and topographic features. Large map collections from pioneer times to the present are also at each of the University of Californiacampuses (including Berkeley, Davis, Los Angeles, Riverside, San Diego, Santa Barbara, and Santa Cruz) and the fourteen campuses of California State College.
Printable maps are also available from the National Atlas of the United States -- http://nationalatlas.gov/printable.html