Ontario is 12% cheaper than Santa Rosa.
When comparing Ontario, CA and Santa Rosa, CA, the overall cost of living indices are 152 and 172 respectively (national median = 100). Rent is $168/month cheaper in Ontario, saving renters about $2,016/year.
Median household income is $14,604/year higher in Santa Rosa. Home values also differ significantly — the median in Ontario is $568,000 compared to $685,000 in Santa Rosa.
Both cities share the same state tax structure since they are in California.
Ontario vs Santa Rosa — common questions
Other cost of living comparisons for Ontario and Santa Rosa