Washington is 24% more expensive than McKinney.
When comparing Washington, DC and McKinney, TX, the overall cost of living indices are 171 and 138 respectively (national median = 100). Rent is $59/month cheaper in McKinney, saving renters about $708/year.
Median household income is $13,986/year higher in McKinney. Home values also differ significantly — the median in Washington is $724,600 compared to $439,500 in McKinney.
Texas has no state income tax, giving McKinney residents a significant tax advantage over District of Columbia's 10.75% rate.
Washington vs McKinney — common questions
Other cost of living comparisons for Washington and McKinney