Washington is 114% more expensive than Columbia.
When comparing Washington, DC and Columbia, MO, the overall cost of living indices are 171 and 80 respectively (national median = 100). Rent is $833/month cheaper in Columbia, saving renters about $9,996/year.
Median household income is $41,799/year higher in Washington. Home values also differ significantly — the median in Washington is $724,600 compared to $268,300 in Columbia.
Missouri has a lower income tax rate, making Columbia slightly more tax-friendly.
Washington vs Columbia — common questions
Other cost of living comparisons for Washington and Columbia