Ontario is 2% cheaper than Vallejo.
When comparing Ontario, CA and Vallejo, CA, the overall cost of living indices are 152 and 155 respectively (national median = 100). Rent is $97/month cheaper in Ontario, saving renters about $1,164/year.
Median household income is $6,690/year higher in Vallejo. Home values also differ significantly — the median in Ontario is $568,000 compared to $557,500 in Vallejo.
Both cities share the same state tax structure since they are in California.
Ontario vs Vallejo — common questions
Other cost of living comparisons for Ontario and Vallejo