How does the cost of living in Rapid City compare to the national average?

Rapid City’s cost‑of‑living index is 99, which is essentially on par with the national average of 100. That means everyday expenses such as groceries, utilities, and transportation are roughly comparable to what you would pay across the United States. Because the average rent is $1,338 per month and the median household salary is about $46,200 annually, your housing costs will represent a typical share of income for the area. If you budget based on national averages, you should find your expenses in Rapid City to be fairly predictable, though you may notice slight variations in specific categories like health care or entertainment.