See Which Cities Pay the Highest Software Engineering Salaries Adjusted for COL
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A much more useful calculation (and much harder) is how much money is left over living expenses, and how much utility (or enjoyment) is derived from that surplus. It might be nice to live in a low cost of living area, but if all the entertainment options are not appealing, it's not really useful, even if the options are cheap.
Fairfax County, VA, is literally the 2nd richest county in the US; the #1 richest county is right next door. Traffic is heavy, and housing costs keep goin up. Salaries are decent, esp. in the cleared government sector, though civilian gigs are pretty lucrative too.
Don't get me wrong, you'll probably have a decent lifestyle there -- I think about moving back occasionally -- but it's nothing like Omaha or Columbus.
Source: am from there, ran data centers in Reston, Herndon, and Ashburn.
On the other hand, living in Reston/Herndon and commuting to Arlington or DC is both extremely expensive and a guaranteed miserable commute. The Silver Line will probably help when it opens, but it will still be a long train ride, and you'll be at the mercy of WMATA.
Ideally, you'd prefer to compare housing prices within a fixed commuting time of the job location. This is pretty hard, so an alternative would be to use housing prices within the Metropolitan Statistical Area[1], but that's often too coarse.
[1] https://en.wikipedia.org/wiki/Metropolitan_statistical_area
So basically, you probably wont be getting 130k in Columbus unless you get into that company?
Edit: Also the only major employer in Bentonville is Wal-Mart. They own the town, and almost all employers in town service Wal-Mart in some way. There's not a single other major retailer in city limits, there are two options for groceries: Walmart and a local chain of grocers. I guess they did recently put an Aldi in, but it's outside city limits.