ABOUT THE NEIGHBORHOOD. Vacaville is in Solano County, California, a beautiful area between Sacramento, San Francisco, and Napa Valley. Known for its charming blend of rural and suburban landscapes, Vacaville is famous for its vibrant retail environment, including premium outlets that attract shoppers from surrounding areas. The city also boasts a variety of parks and recreational facilities, offering residents and visitors opportunities for outdoor activities. Its convenient location along major highways makes it an appealing choice for commuters working in nearby cities. Vacaville is a fast-growing city offering a mix of brand-new construction and old-charm neighborhoods.