1889
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- The Pacific-Union Club in San Francisco (pictured) is founded as a merger of two earlier clubs: the Pacific Club (founded 1852) and the Union Club (founded 1854)
- The Astronomical Society of the Pacific is founded in San Francisco
- Mayacamas Vineyards is established on the Mayacamas Mountains within the Napa Valley
- St. Paul's Episcopal Church (historical plaque pictured) in Walnut Creek is completed
- Livermore Valley winery Cresta Blanca's first vintage, an 1884 dry white wine, wins Grand Prize at the Paris Exposition, becoming the first California wine to win a competition in France