Portland is 60% more expensive than Billings.
When comparing Portland, OR and Billings, MT, the overall cost of living indices are 138 and 86 respectively (national median = 100). Rent is $499/month cheaper in Billings, saving renters about $5,988/year.
Median household income is $16,937/year higher in Portland. Home values also differ significantly — the median in Portland is $557,600 compared to $311,800 in Billings.
Montana has a lower income tax rate, making Billings slightly more tax-friendly.
Portland vs Billings — common questions
Other cost of living comparisons for Portland and Billings