Washington is 99% more expensive than Billings.
When comparing Washington, DC and Billings, MT, the overall cost of living indices are 171 and 86 respectively (national median = 100). Rent is $803/month cheaper in Billings, saving renters about $9,636/year.
Median household income is $34,432/year higher in Washington. Home values also differ significantly — the median in Washington is $724,600 compared to $311,800 in Billings.
Montana has a lower income tax rate, making Billings slightly more tax-friendly.
Washington vs Billings — common questions
Other cost of living comparisons for Washington and Billings