VALLEJO, a city of Solano county, California, United States, is situated on the shore of San Pablo Bay, near the western end of the Straits of Carquinez. It has an excellent harbour, and railroad communication by a branch of the Central Pacific Railroad. The city contains large flour-mills; the population in 1880 was 5987. Vallejo, which takes its name from the Mexican general Μ. G. Vallejo, who took the country from the Indians in 1835, was in 1854 the capital of the State of California.