Vacaville, California 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 University of California, Davis campus is located about 20 miles (32 km) to the northeast.
At one time an Onion Festival was held annually. This stopped in 2000 due to the onion processing plant being closed down.
There are a number of rare and endangered species in the Vacaville area. Endangered plants which have historically occurred in the vernal pool areas in and around Vacaville include Legenre limosa, Plagiobothrys hystriculus, Downingia humilis, Contra Costa Goldfields (Lasthenia conjugens), and Showy Indian clover (Trifolium amoenum). However, Showy Indian clover is now thought to be extinct throughout Solano County.
According to the United States Census Bureau, the city has a total area of 70.1 km² (27.1 mi²). Approximately 100% of the area is land. Excluding the Putah South Canal and minor local creeks, the only significant body of water within the city is the 105-acre (0.42 km2) Lagoon Valley Lake.
As of the 2000 census, there are 88,625 people residing in the city. The population density is 1,263.6/km² (3,272.3/mi²). There are 28,696 housing units at an average density of 409.1/km² (1,059.5/mi²). The racial makeup of the city is 72.11% White, 10.02% African American, 0.97% Native American, 4.18% Asian, 0.45% Pacific Islander, 6.74% from other races, and 5.53% from two or more races. 17.88% of the population are Hispanic or Latino of any race.
Of the 28,105 households, 20,966 are families: 41.4% have children under the age of 18 living with them, 57.0% are married couples living together, 12.4% have a female householder with no husband present, and 25.4% are non-families. 19.2% of all households are made up of individuals and 6.4% have someone living alone who is 65 years of age or older. The average household size is 2.83 and the average family size is 3.24.
The median age is 34 years, and the age distribution of the population is rather spread out: 27.0% under the age of 18, 9.0% from 18 to 24, 35.4% from 25 to 44, 20.3% from 45 to 64, and 8.3% who are 65 years of age or older. However, the sex ratio is higher than the national average. For every 100 females there are 118.4 males. For every 100 females age 18 and over, there are 124.7 males.
Vacaville has the highest per capita concentration of electric cars in the world, giving it the nickname "Voltageville".
The median income for a household in the city is $57,667, and the median income for a family is $63,950. Males have a median income of $43,527 versus $31,748 for females. The per capita income for the city is $21,557. 6.1% of the population and 4.3% of families are below the poverty line. Out of the total population, 7.4% of those under the age of 18 and 4.8% of those 65 and older are living below the poverty line.
Vacaville is a growing biotechnology/pharmaceutical hub with facilities operated by Genentech, ALZA Corporation, Kaiser Permanente, and Novartis International AG. The Solano Community College offers an associates degree in biotechnology.
The city holds annual Vacaville Fiesta Days.
The state's California Medical Facility is located in the city. This is a prison that houses inmates undergoing medical treatments. Many prisoners convicted of sex crimes are housed at Vacaville, which brought the prison attention during the creation of Megan's Law.
The city has two unified public school districts, a community college district, many private schools and colleges.
The Vacaville Unified School District includes the following campuses:
The Travis Unified School District campuses include:
Its campuses serving Vacaville secondary students are:
Private institutions with campuses in Vacaville are:
The town has a District supporting the Solano Community College.
Other colleges and universities include: