Vernalis is an unincorporated community in San Joaquin County, California, United States. Vernalis is located on California State Route 33 10.5 miles southeast of Tracy. The first post office in the area opened in San Joaquin City in 1851; that post office closed in 1852, reopened in 1874, and was moved 3 miles southwest in 1888, after which its nam…Vernalis is an unincorporated community in San Joaquin County, California, United States. Vernalis is located on California State Route 33 10.5 miles southeast of Tracy. The first post office in the area opened in San Joaquin City in 1851; that post office closed in 1852, reopened in 1874, and was moved 3 miles southwest in 1888, after which its name was changed to Vernalis.
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