Billings is 41% more expensive than Springfield.
When comparing Billings, MT and Springfield, IL, the overall cost of living indices are 86 and 61 respectively (national median = 100). Rent is $152/month cheaper in Springfield, saving renters about $1,824/year.
Median household income is $6,318/year higher in Billings. Home values also differ significantly — the median in Billings is $311,800 compared to $155,200 in Springfield.
Illinois has a lower income tax rate, making Springfield slightly more tax-friendly.
Billings vs Springfield — common questions
Other cost of living comparisons for Billings and Springfield