Vallejo, val ya'ho, CAL., a city of Solano co., situated on the northeastern shore of San Pablo Bay, 23 mi. n. e. of San Francisco and on the Southern Pacific railroad. It is noted for its large and deep harbor, which admits the largest ocean ships. The city is built on the slopes of a hill, and the surrounding country is devoted to fruit raising. The public institutions include an orphans' home, Saint Vincent's Academy and the sailors' clubhouse. There are a few manufactures and some tanneries. Vallejo is an important shipping port for grain and is near the United States navy yard on Mare Island. Population in 1910, 11,340.