Portland is 126% more expensive than Springfield.
When comparing Portland, OR and Springfield, IL, the overall cost of living indices are 138 and 61 respectively (national median = 100). Rent is $651/month cheaper in Springfield, saving renters about $7,812/year.
Median household income is $23,255/year higher in Portland. Home values also differ significantly — the median in Portland is $557,600 compared to $155,200 in Springfield.
Illinois has a lower income tax rate, making Springfield slightly more tax-friendly.
Portland vs Springfield — common questions
Other cost of living comparisons for Portland and Springfield