Ontario is 19% more expensive than Richardson.
When comparing Ontario, CA and Richardson, TX, the overall cost of living indices are 152 and 128 respectively (national median = 100). Rent is $91/month cheaper in Richardson, saving renters about $1,092/year.
Median household income is $13,451/year higher in Richardson. Home values also differ significantly — the median in Ontario is $568,000 compared to $405,600 in Richardson.
Texas has no state income tax, giving Richardson residents a significant tax advantage over California's 13.3% rate.
Ontario vs Richardson — common questions
Other cost of living comparisons for Ontario and Richardson