United States post offices operate under the authority of the United States Post Office Department (1792–1971) or the United States Postal Service (since 1971). Historically, post offices were usually placed in a prominent location. Many were architecturally distinctive, including notable buildings featuring Beaux-Arts, Art Deco, and Vernacular architecture. However, modern U.S. post offices were generally designed for functionality rather than architectural style.

Following is a list of United States post offices in California. Notable post offices include individual buildings, whether still in service or not, which have architectural, historical, or community-related significance. Many of these are listed on the National Register of Historic Places (NRHP) or state and local historic registers.

Post officeCityDate builtImageArchitectNotesUnited States Post Office – Alhambra, CaliforniaAlhambra1935–1936John W. SmartUnited States Post Office (Berkeley, California)Berkeley1914Oscar WenderothBeverly Hills Main Post OfficeBeverly Hills1934Ralph Carlin Flewelling,Allison & AllisonUnited States Post Office (Burbank, California)Burbank1937Gilbert Stanley UnderwoodUnited States Post Office, now Chico Midtown StationChico1914 J. W. Roberts,Oscar WenderothEl Centro Main Post OfficeEl Centro1931–1932 James A. Wetmore,Louis A. Simon With United States Post Office and Courthouse (Eureka, California)Eureka1910James Knox Taylor Fullerton Post OfficeFullerton1939Roy A. BenjaminGlendale Main Post OfficeGlendale1934George M. LindsayHollywood Post OfficeHollywood, Los Angeles1925Morgan, Walls & ClementsUnited States Post Office (Hollywood, California)Hollywood, Los Angeles1937Claud BeelmanLa Jolla Post OfficeLa Jolla1935Louis A. SimonLong Beach Main Post OfficeLong Beach1934James A. Wetmore,Louis A. SimonUS Court House and Post Office, now Spring Street CourthouseLos Angeles1937–1940Gilbert Stanley Underwood,Louis A. SimonU.S. Post Office-Los Angeles Terminal AnnexLos Angeles1940Gilbert Stanley Underwood with United States Post Office-Martinez Downtown Martinez1936–1937Louis A. SimonUnited States Post Office--Marysville MainMarysville1932–1934James A. WetmoreUnited States Post Office (Merced, California)Merced1933Allison & AllisonEl Viejo Post OfficeModesto1933James A. WetmoreUnited States Post Office (Napa, California)Napa1933 William H. Corlett .Newbury Park Post OfficeNewbury Park1875, 1968Sprankling, Miriam (2002). Discovering the Story of The Conejo Valley. Newbury Park, CA: Conejo Valley Historical Society. .Main Post Office and Federal Building (Oakland, California)Oakland1931James A. Wetmore,William A. NewmanUnited States Post Office-Oroville MainOroville1932–1933United States Post Office (Palo Alto, California)Palo Alto1932–1933Birge ClarkUnited States Post Office (Petaluma, California)Petaluma1933James A. Wetmore,Louis A. Simon With United States Post Office (Porterville, California)Porterville1933–1937H. Rafael LakeUnited States Post Office (Redlands, California)Redlands1932–1935G. Stanley Wilson .U.S. Post Office, Courthouse and Federal Building, now Federal Building (Sacramento)Sacramento1932–1933Starks and FlandersSan Bernardino Downtown StationSan Bernardino1931James A. Wetmore,Louis A. Simon .United States Post Office-Downtown Station (San Diego, California)San Diego1936–1938William Templeton JohnsonUnited States Post Office (San Fernando, California)San Fernando1934Louis A. Simon,George O. Von NertaFerry Station Post Office BuildingSan Francisco1915A. A. PyleU.S. Post Office and Courthouse, now James R. Browning United States Court of Appeals BuildingSan Francisco1897–1905James Knox TaylorRincon Center (formerly Rincon Annex)San Francisco1940Gilbert Stanley UnderwoodOld Post Office San JoseSan Jose1933Ralph WyckoffU.S. Post Main Office–San Mateo, now St. Matthew StationSan Mateo1936United States Post Office (San Pedro, Los Angeles)San Pedro1936Louis A. SimonUnited States Post Office Station-Spurgeon StationSanta AnaUnited States Post Office-Santa Barbara MainSanta Barbara1937Reginald Davis JohnsonUS Post Office--Santa Cruz MainSanta Cruz1936James Knox TaylorOld Post Office–Santa MonicaSanta Monica1937–1938Louis A. Simon,Neal A. MelickOld Post Office (Santa Rosa, California), now Museum of Sonoma CountySanta Rosa1910James Knox TaylorUnited States Post Office (Stockton, California)Stockton1932–1933Bliss and Fairweather,Howard G. BissellUkiah Main Post OfficeUkiah1937Louis A. Simon,Neal A. MelickUnited States Post Office (Venice, California)Venice1939Louis A. Simon,Neal A. MelickUnited States Post Office-Visalia Town Center StationVisalia 1932–1933William D. CoatesUnited States Post Office (Willows, California)Willows1918Walter Danforth Bliss,William Baker Faville

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