McKinney is 8% more expensive than Richardson.
When comparing McKinney, TX and Richardson, TX, the overall cost of living indices are 138 and 128 respectively (national median = 100). Rent is comparable in both cities, with less than $50/month separating them.
Median household income is $24,016/year higher in McKinney. Home values also differ significantly — the median in McKinney is $439,500 compared to $405,600 in Richardson.
Both cities share the same state tax structure since they are in Texas.
McKinney vs Richardson — common questions
Other cost of living comparisons for McKinney and Richardson