Denver is 15% more expensive than Richardson.
When comparing Denver, CO and Richardson, TX, the overall cost of living indices are 147 and 128 respectively (national median = 100). Rent is $55/month cheaper in Denver, saving renters about $660/year.
Median household income is $4,576/year higher in Richardson. Home values also differ significantly — the median in Denver is $586,700 compared to $405,600 in Richardson.
Texas has no state income tax, giving Richardson residents a significant tax advantage over Colorado's 4.4% rate.
Denver vs Richardson — common questions
Other cost of living comparisons for Denver and Richardson