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is located in Solano County, California, United States, between Sacramento and San Francisco. As of the 2000 census, the city had a total population of 88,625. According to the Community Development Department of the City of Vacaville, the total population as of 2005 was 96,735. The city was founded in 1852 by William McDaniel and named after Juan Manuel Vaca, who had received a substantial land grant from Don Mariano Guadalupe Vallejo.
The city is known for its retail shopping and its annual Vacaville Fiesta Days. The University of California, Davis campus is located about to the northeast.
The city was a Pony Express stop and was home to many large produce companies and local farms which flourished due to the Vaca Valley's rich soil, including The Nut Tree.
At one time an Onion Festival was held annually. This stopped in 2000 due to the onion processing plant being closed down.
In the summer of 2003, a crop circle was discovered by a local pilot in a cornfield in the outskirts of Vacaville. However, they failed to generate much interest.