Vacaville is a city located in Solano County in Northern California. The city is nearly half way between Sacramento and San Francisco on I-80. It sits approximately 35 miles (56km) from Sacramento, and 45 miles (72km) from San Francisco. As of the 2010 census, the city had a population of 92,428, making it the third largest city in Solano County.
The city was founded on December 13, 1851 by William McDaniel, on a part of the 1843 Mexican land grant Rancho Los Putos purchased from Manuel Cabeza Vaca.
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