California historical topo maps: O
28 historical topo maps of California whose names start with O. These are the USGS 15-minute (1:62,500) quadrangles from the mid-1900s: old roads, mines, homesteads, rail lines and place names that newer maps leave off.
- Observation Peak, CA (1954)
- Oceanside, CA (1893)
- Oceanside, CA (1898)
- Oceanside, CA (1901)
- Oceanside, CA (1942)
- Ogilby, CA (1953)
- Ogilby, CA (1963)
- Olancha, CA (1956)
- Old Dad Mountain, CA (1956)
- Old Woman Springs, CA (1955)
- Ono, CA (1952)
- Ontario, CA (1954)
- Onyx, CA (1943)
- Opal Mountain, CA (1955)
- Orchard Peak, CA (1961)
- Ord Mountains, CA (1955)
- Orestimba, CA (1919)
- Orestimba, CA (1941)
- Orick, CA (1945)
- Orick, CA (1952)
- Orleans, CA (1952)
- Ornbaun Valley, CA (1960)
- Ornbaun, CA (1943)
- Ornbaun, CA (1944)
- Oroville, CA (1942)
- Oroville, CA (1944)
- Ortigalita Peak, CA (1943)
- Ortigalita Peak, CA (1956)